JAMB UTME - Biology - 2012 | Green Bridge CBT

The presence of stilt roots, pneumatophores, sunken stomata, and salt glands are all adaptive features of plants found in mangrove swamps. Mangrove swamps are unique ecosystems found in tropical and subtropical regions where land meets the sea. These areas are characterized by fluctuating tidal levels, high salinity, and low oxygen levels, making them a challenging environment for most plants to survive in. Plants in mangrove swamps have evolved several adaptations to survive in these conditions. Stilt roots, for example, are long, thin roots that help anchor the plant in the soft, muddy substrate and allow it to remain stable during periods of high tidal currents. Pneumatophores, on the other hand, are specialized aerial roots that extend above the waterline and allow the plant to exchange gases with the atmosphere, ensuring that the root system remains oxygenated. Sunken stomata are another adaptation found in mangrove plants. Stomata are the small pores on the surface of leaves that allow for gas exchange. In mangroves, these stomata are located on the underside of the leaves, which helps to reduce water loss through transpiration in the high humidity environment of the mangrove swamp. Finally, mangrove plants also have salt glands, which are specialized structures located on the surface of the leaves that allow the plant to excrete excess salt. This is important because the high salt content of the water and soil in the mangrove swamp can be toxic to many plant species. Overall, these adaptations allow mangrove plants to survive and thrive in the challenging conditions of the mangrove swamp ecosystem.

Lee la nota de la lección en Support And Movement (JAMB)

Lee la nota de la lección en Excretion (JAMB)

Support And Movement

Excretion

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Pregunta 5 Informe

The feature that links birds to reptiles in evolution is the possession of

feathers

break

skeleton

scales

Detalles de la respuesta

The feature that links birds to reptiles in evolution is the possession of scales. Scales are bony or horny plates that cover the skin of reptiles and birds. Although birds have feathers, which are not found in reptiles, both birds and reptiles evolved from a common ancestor that had scales. Over time, some descendants of this common ancestor evolved feathers for various reasons, such as insulation, flight, or display, while others retained scales or evolved other adaptations. Thus, the possession of scales is a shared ancestral trait that helps to connect birds and reptiles in the tree of life.

Lee la nota de la lección en Respiration (JAMB)

Lee la nota de la lección en Evolution (Theories and Evidence) (WAEC)

Lee la nota de la lección en Evidence Of Evolution (JAMB)

Lee la nota de la lección en Evolution (Recombination DNA) (WAEC)

Respiration

Evolution (Theories and Evidence)

Evidence Of Evolution

Evolution (Recombination DNA)

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Pregunta 6 Informe

The type of interaction shown is referred to as

interspecific competition

intraspecific competition

mutualism

cooperation

Detalles de la respuesta

Lee la nota de la lección en Symbiotic Interactions Of Plants And Animals (JAMB)

Lee la nota de la lección en Factors Affecting The Distribution Of Organisms (JAMB)

Lee la nota de la lección en Natural Habitats (JAMB)

Symbiotic Interactions Of Plants And Animals

Factors Affecting The Distribution Of Organisms

Natural Habitats

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Pregunta 7 Informe

The carrying capacity of a habitat is reached when the population growth begins to

increase slowly

increase exponentially

slow down

remain steady

Detalles de la respuesta

Lee la nota de la lección en Co-ordination And Control (JAMB)

Co-ordination And Control

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Pregunta 8 Informe

The abiotic factors that control human population include

disease and famine

space and rainfall

flooding and earthquake

temperature and disease

Detalles de la respuesta

Lee la nota de la lección en Factors Affecting The Distribution Of Organisms (JAMB)

Lee la nota de la lección en Heredity (JAMB)

Factors Affecting The Distribution Of Organisms

Heredity

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Pregunta 9 Informe

The fungi are distinct group of eukaryote mainly because they have

spores

no chlorophyll

many fruiting bodies

sexual and sexual reproduction

Detalles de la respuesta

Fungi are a distinct group of eukaryotic organisms mainly because they lack chlorophyll and therefore cannot perform photosynthesis like plants do. Instead, they obtain their nutrients by absorbing organic matter from their surroundings. Additionally, fungi are characterized by their ability to produce spores, which can be dispersed over long distances by wind or water to colonize new areas. Fungi can also produce fruiting bodies, such as mushrooms, which are used for reproduction. Fungi can reproduce both sexually and asexually, which allows them to adapt to changing environmental conditions and ensure the survival of their species.

Lee la nota de la lección en Forms In Which Living Cells Exist (WAEC)

Lee la nota de la lección en Identification Of Organisms Using Biological Keys (WAEC)

Forms In Which Living Cells Exist

Identification Of Organisms Using Biological Keys

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Pregunta 10 Informe

Plants that show secondary growth are usually found among the

thallophytes

pteridophytes

monocotyledons

dicotyledons

Detalles de la respuesta

Plants that show secondary growth are usually found among the dicotyledons. Secondary growth refers to the increase in girth or thickness of a plant stem or root. It occurs due to the activity of lateral meristems, which produce new cells that differentiate into secondary tissues such as secondary xylem and phloem. These tissues provide mechanical support and conduct water and nutrients throughout the plant. Dicotyledons are a group of flowering plants that have two seed leaves (cotyledons) when they germinate. They typically have a taproot system and their stems show secondary growth, resulting in the formation of a woody stem. This is in contrast to monocotyledons, which have a fibrous root system and lack secondary growth in their stems. Therefore, based on these characteristics, it can be concluded that plants that show secondary growth are usually found among the dicotyledons.

Lee la nota de la lección en Nutrition (JAMB)

Lee la nota de la lección en Morphology Of Monocotyledonous And Dicotyledonous Plants (WAEC)

Nutrition

Morphology Of Monocotyledonous And Dicotyledonous Plants

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Pregunta 11 Informe

Countershading is an adaptive feature that enables animals to

fight enemies

remain undetected

warn enemies

attract mates

Detalles de la respuesta

Countershading is an adaptive feature that enables animals to remain undetected. Countershading is a type of camouflage in which an animal's body is darker on the upper side and lighter on the lower side. This coloration helps to create an optical illusion that makes the animal harder to see in its natural environment. When viewed from above, the darker coloration blends in with the shadows on the ground, while the lighter coloration blends in with the brightness of the sky. When viewed from below, the lighter coloration blends in with the brightness of the water or the sky, while the darker coloration blends in with the shadows on the ground. This type of camouflage is especially useful for animals that live in open environments, such as the ocean or grasslands, where there is little cover to hide behind. By remaining undetected, animals can avoid predation and increase their chances of survival.

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Adaptive Colouration

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Pregunta 12 Informe

Which of the following animals can exist solely on the water they get from food and metabolic reactions?

forest arboreal dweller

Desert dwellers

forest-ground dweller

rainforest dwellers

Detalles de la respuesta

Of the given options, it is likely that desert dwellers are the animals that can exist solely on the water they get from food and metabolic reactions. This is because desert environments are characterized by extreme aridity, with very little water available. As a result, many desert-dwelling animals have adaptations that allow them to obtain water from their food or through metabolic processes, rather than relying on external sources of water. For example, some desert animals may have very efficient kidneys that enable them to extract the maximum amount of water from their urine. Others may have specialized diets that allow them to obtain water from the food they eat, such as cacti that store water in their tissues. Some animals may also have adaptations that allow them to produce metabolic water, which is generated through the breakdown of food molecules. In contrast, forest arboreal dwellers, forest-ground dwellers, and rainforest dwellers generally have access to more water than desert dwellers, as these environments tend to be more humid and have greater amounts of precipitation. As a result, animals in these environments are less likely to have evolved specialized adaptations for obtaining water from their food or metabolic processes.

Lee la nota de la lección en Forms In Which Living Cells Exist (WAEC)

Forms In Which Living Cells Exist

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Pregunta 13 Informe

When a colour-blind man marries a carrier woman. What is the probability of their offspring being colour blind?

25%

50%

75%

100%

Detalles de la respuesta

Color blindness is a genetic condition that is usually passed down from a parent to their child. It occurs when there is an issue with the genes that determine the colors that the eyes can see. Typically, the genes for color vision are located on the X chromosome. Since men have only one X chromosome, they are more likely to be color blind than women, who have two X chromosomes. In this scenario, a color-blind man has married a woman who is a carrier of the color blindness gene. This means that she has one normal X chromosome and one X chromosome with the color blindness gene. Each of their children has a 50% chance of inheriting the color blindness gene from their mother. If a child inherits the gene, whether they are male or female, they will have some form of color blindness. If the child does not inherit the gene, they will not have color blindness. Therefore, the probability of their offspring being color-blind is not 0% because the man is already color-blind, but it is also not 100% because the woman is only a carrier and has one normal X chromosome. The correct answer is 50%.

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Genetic Terminologies

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Pregunta 14 Informe

Which of the following plant structures lacks a waterproof cuticle?

leaf

stem

root

shoot

Detalles de la respuesta

A plant structure that lacks a waterproof cuticle is the root. The cuticle is a waxy layer that covers the outer surface of leaves and stems in plants, which helps to prevent water loss. However, roots are usually buried in soil, and they do not need a cuticle to prevent water loss since soil provides moisture to the roots. In fact, roots often have tiny root hairs that increase their surface area for absorbing water from the soil. Therefore, roots do not have a waterproof cuticle like leaves and stems.

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Cell Structure

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Pregunta 15 Informe

An indigenous method of renewing and maintaining soil fertility is by

clearing farms by burning

planting one crop type

adding inorganic fertilizers yearly

crop rotation and shifting cultivation

Detalles de la respuesta

An indigenous method of renewing and maintaining soil fertility is by crop rotation and shifting cultivation. This method involves growing different crops on the same land in a rotating pattern, rather than planting the same crop year after year. This helps to maintain soil fertility because different crops have different nutrient requirements. Growing different crops also helps to reduce soil erosion, as some crops have roots that hold the soil in place, while others have leaves that protect the soil from the sun and wind. Additionally, shifting cultivation involves moving from one plot of land to another, allowing the previously farmed land to lie fallow and recover its fertility. This method is often used in traditional agricultural systems and can be an effective way to maintain soil fertility and productivity for future generations.

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Lee la nota de la lección en Internal Structure Of A Flowering Plant (JAMB)

Soil

Internal Structure Of A Flowering Plant

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Pregunta 16 Informe

Which of the following is the lowest category of classification?

class

species

family

genus

Detalles de la respuesta

The lowest category of classification is species. In biology, organisms are classified based on their shared characteristics into a hierarchical system of groups, or taxa. The hierarchy of taxa, from the broadest to the most specific, is as follows: kingdom, phylum, class, order, family, genus, and species. Species is the most specific and lowest level of classification. It refers to a group of organisms that share common characteristics and can interbreed to produce fertile offspring. Each species is given a unique scientific name, consisting of two parts: the genus and species name. For example, Homo sapiens is the scientific name for humans, with "Homo" being the genus and "sapiens" being the species.

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Classification

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Pregunta 17 Informe

A yellow maize is planted and all the fruits obtained are of yellow seeds. When they are croos-bred, yellow seeds and white seeds are obtained in a ratio 3:1 . The yellow seed is said to be

non-heritable

sex-linked

a recessive trait

a dominant trait

Detalles de la respuesta

Lee la nota de la lección en Chromosomes: The Basis Of Heredity (WAEC)

Chromosomes: The Basis Of Heredity

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Pregunta 18 Informe

Which of the following is a polysaccharide?

Glucose

Sucrose

Maltose

Cellulose

Detalles de la respuesta

The polysaccharide among the options listed is cellulose. Carbohydrates are one of the main types of biomolecules in living organisms and they can be classified into three main groups: monosaccharides, disaccharides, and polysaccharides. Monosaccharides are simple sugars that cannot be further broken down into smaller sugars, while disaccharides are formed by two monosaccharides joined by a glycosidic bond. Polysaccharides are complex carbohydrates made up of many monosaccharide units linked together. They can be found in many biological structures, such as cell walls, energy storage molecules, and structural components. Glucose, sucrose, and maltose are all examples of simple sugars, and therefore not polysaccharides. Cellulose, on the other hand, is a polysaccharide that is an important structural component in the cell walls of plants and algae. It is composed of long chains of glucose molecules linked by β-glycosidic bonds, and it provides rigidity and strength to the cell wall.

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Nucleic Acids

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Pregunta 19 Informe

Use the diagram above to answer this question.

The graph illustrates

the highest frequency for height of 2 metres

a discontinuously varying character

a continuously varying character

total yield in a cassava farm

Detalles de la respuesta

Lee la nota de la lección en Biology As A Science Of Life (WAEC)

Biology As A Science Of Life

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Pregunta 20 Informe

Plants of temperate origin can be grown in tropical areas in the vegetation zones of the

rain forest

guinea savanna

sudan savanna

montane forest

Detalles de la respuesta

Lee la nota de la lección en Forms In Which Living Cells Exist (WAEC)

Lee la nota de la lección en Ecosystem (WAEC)

Forms In Which Living Cells Exist

Ecosystem

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Pregunta 21 Informe

Which of the following is most advanced in the evolutionary trend of animals?

Liverfluke

Earthworm

Snail

Cockroach

Detalles de la respuesta

Lee la nota de la lección en Variation In Population (JAMB)

Lee la nota de la lección en Evolution (Theories and Evidence) (WAEC)

Lee la nota de la lección en Growth (JAMB)

Lee la nota de la lección en Evolution (Recombination DNA) (WAEC)

Variation In Population

Evolution (Theories and Evidence)

Growth

Evolution (Recombination DNA)

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Pregunta 22 Informe

A function of the hydrochloric acid produced in the human stomach during digestion is to

neutralise the effect of bile

coagulate milk protein and emulsify fats

stop the action of ptyalin

break up food into smaller particles

Detalles de la respuesta

Lee la nota de la lección en Alimentary System (WAEC)

Alimentary System

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Pregunta 23 Informe

Use the diagram above to answer this question. Arrows represent directional movement materials.

The arrow labelled ll represents the

release of oxygen

intake of carbon (IV) oxide

movement of photosynthates

movement of nutrients

Detalles de la respuesta

Lee la nota de la lección en Adaptive Colouration (WAEC)

Lee la nota de la lección en Cell Structure (WAEC)

Adaptive Colouration

Cell Structure

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Pregunta 24 Informe

Use the diagram above to answer this question.

The developing embryo is usually contained in the part labelled

III

Detalles de la respuesta

The developing embryo is usually contained in the part labelled "II". This is because part II, also known as the uterus, is the organ that provides the necessary environment and nutrients for the embryo to develop and grow into a fetus. The uterus has a thick lining called the endometrium, which thickens and prepares for the implantation of the fertilized egg. Once the fertilized egg implants in the endometrium, it receives nourishment and support from the uterus as it develops into an embryo, which eventually becomes a fetus. Therefore, the uterus is the part of the female reproductive system that plays a crucial role in the development of the embryo.

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Pregunta 25 Informe

In the diagram, which of the following statement is true of the interaction

P aurelia is better adapted for obtaining food than P caudatum

P caudatum is better adapted for obtaining food than P. aurelia

both organisms cannot coexist

both organisms cannot reproduce

Detalles de la respuesta

Lee la nota de la lección en Adaptive Colouration (WAEC)

Lee la nota de la lección en Properties And Functions Of The Living Cell (WAEC)

Adaptive Colouration

Properties And Functions Of The Living Cell

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Pregunta 26 Informe

Use the diagram above to answer this question.

The organelle responsible for heredity is labelled

III

Detalles de la respuesta

Lee la nota de la lección en Chromosomes: The Basis Of Heredity (WAEC)

Chromosomes: The Basis Of Heredity

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Pregunta 27 Informe

The basking of Agama lizards in the sun is to

change the colour of their body

raise their body temperature to become active

fight to defend their territories

attract the female for courtship

Detalles de la respuesta

Agama lizards bask in the sun primarily to raise their body temperature and become more active. Like other reptiles, Agama lizards are cold-blooded and depend on external sources of heat to regulate their body temperature. By basking in the sun, they absorb heat and warm up their bodies, which allows them to become more active and better able to carry out essential activities such as foraging and hunting. While basking, Agama lizards may also change the color of their body, but this is a secondary function and not the primary reason for their behavior. The change in color is due to the movement of pigment cells in their skin, which respond to changes in temperature, light, and other environmental factors. Basking in the sun does not directly help Agama lizards fight to defend their territories or attract females for courtship. These are behaviors that are usually associated with male Agama lizards, who may engage in territorial displays and physical combat to establish dominance over their rivals and attract females. However, basking in the sun can indirectly support these behaviors by helping the lizards stay active and alert, which can give them an advantage in territorial disputes and courtship rituals.

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Behavioural Adaptations In Social Animals

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Pregunta 28 Informe

In the kidney of mammals, the site of ultrafiltration is the

uriniferous tubule

Bowman's capsule

loop of Henle

renal tubule

Detalles de la respuesta

The site of ultrafiltration in the kidney of mammals is Bowman's capsule. Bowman's capsule is the first part of the nephron, which is a microscopic structure responsible for filtering blood and producing urine. Blood enters the nephron through a tiny blood vessel called the afferent arteriole, which leads into the glomerulus, a network of capillaries surrounded by Bowman's capsule. As blood flows through the glomerulus, small molecules such as water, salts, and waste products are forced out of the blood vessels and into the capsule by a process called ultrafiltration. This filtered fluid, known as glomerular filtrate, then passes through the rest of the nephron, where additional filtering and processing takes place to produce urine.

Lee la nota de la lección en Excretory Systems And Mechanisms; Types Of Excretory Systems (WAEC)

Lee la nota de la lección en Cell Structure (WAEC)

Lee la nota de la lección en Nervous Coordination (WAEC)

Excretory Systems And Mechanisms; Types Of Excretory Systems

Cell Structure

Nervous Coordination

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Pregunta 29 Informe

An animal body that can be cut along its axis in any plane to give two identical parts is said to be

radially symmetrical

bilaterally symmetrical

asymmetrical

symmetrical

Detalles de la respuesta

Lee la nota de la lección en Body Symmetry, Sectioning And Orientation (WAEC)

Body Symmetry, Sectioning And Orientation

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Pregunta 30 Informe

In the mammalian male reproductive system, the part that serves as a passage for both urine and semen is the

urethra

urter

bladder

seminal vesicle

Detalles de la respuesta

The part in the mammalian male reproductive system that serves as a passage for both urine and semen is the urethra. The urethra is a tube-like structure that connects the urinary bladder to the outside of the body. In males, the urethra passes through the penis and serves as a passage for both urine and semen. During urination, urine travels from the bladder and out through the urethra to be expelled from the body. During ejaculation, semen (which contains sperm and other fluids) travels from the testes and out through the urethra to be expelled from the body. The urethra has a valve-like structure that prevents urine and semen from being expelled at the same time, ensuring that each fluid is expelled separately. Overall, the urethra is an important part of the male reproductive system as it serves as a common passage for both urine and semen to exit the body.

Lee la nota de la lección en Properties And Functions Of The Living Cell (WAEC)

Properties And Functions Of The Living Cell

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Pregunta 31 Informe

An example of a fruit that develops from a single carpel is

okro

tomato

bean

orange

Detalles de la respuesta

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Pregunta 32 Informe

The largest number of cassava plants has an approximate height of

1.4m

1.6m

1.8m

2.0m

Detalles de la respuesta

Lee la nota de la lección en Plant Nutrition (WAEC)

Plant Nutrition

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Pregunta 33 Informe

Which of the following possesses mammary gland?

Dogfish

whale

shark

catfish

Detalles de la respuesta

Out of the four options, only the whale possesses mammary glands. Mammary glands are a defining characteristic of mammals and are responsible for producing milk to nourish their offspring. While all four animals are vertebrates, not all vertebrates are mammals. Mammals are a group of animals characterized by the presence of hair or fur, the ability to regulate their body temperature internally, and the presence of mammary glands. Dogs, cats, whales, and sharks are all different types of vertebrates, but only whales are mammals and possess mammary glands. Dogs, cats, and sharks are all examples of non-mammalian vertebrates. While they may produce some form of nourishment for their young, it is not produced by mammary glands. Catfish, on the other hand, are a type of fish and do not produce milk or any other form of nourishment for their young beyond their initial supply of yolk sac nutrients.

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Pregunta 34 Informe

Organisms living in an estuarine habitat are adapted to

withstand wide fluctuations in temperature

survive only in water with low salinity

withstand wide fluctuations in salinity

feed only on phytoplankton and dead organic matter

Detalles de la respuesta

Organisms living in an estuarine habitat are adapted to withstand wide fluctuations in salinity. An estuary is a partially enclosed body of water where freshwater from rivers and streams meets and mixes with saltwater from the ocean. As a result, the salinity (salt content) of the water in an estuary can vary widely, ranging from almost fresh to fully marine. Organisms that live in estuaries have to be adapted to these changing conditions in order to survive. For example, some estuarine organisms have mechanisms to regulate the amount of salt in their bodies, such as by excreting excess salt or retaining more water. Others may be able to tolerate a range of salinities, but still need time to adjust to rapid changes in salinity. In addition to salinity, estuarine organisms may also need to cope with other environmental stresses, such as wide fluctuations in temperature, changing levels of dissolved oxygen, and variable nutrient availability. However, their ability to withstand changes in salinity is a key adaptation that allows them to live in this unique and challenging habitat.

Lee la nota de la lección en Co-ordination And Control (JAMB)

Lee la nota de la lección en Natural Habitats (JAMB)

Co-ordination And Control

Natural Habitats

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Pregunta 35 Informe

The use and disuse of body parts and the inheritance of acquired traits were used to explain

Darwin's theory

Lamarek's theory

genetic drift

gene flow

Detalles de la respuesta

The use and disuse of body parts and the inheritance of acquired traits were used to explain Lamarck's theory of evolution. Lamarck's theory of evolution was proposed before Darwin's theory and it proposed that acquired characteristics can be passed down from one generation to another. For example, if a giraffe stretches its neck to reach higher leaves, then its neck will become longer and this acquired trait can be passed down to its offspring. This theory also proposed that the disuse of body parts could lead to the loss of those characteristics in the offspring. However, Lamarck's theory was later disproven by scientific evidence and replaced by Darwin's theory of evolution, which proposed that evolution occurs through natural selection and the survival of the fittest. Darwin's theory explained that random genetic mutations occur, and the individuals with favorable mutations are more likely to survive and pass on their genes to their offspring, while those with unfavorable mutations are less likely to survive and reproduce. In summary, the use and disuse of body parts and the inheritance of acquired traits were used to explain Lamarck's theory of evolution, which was later disproven and replaced by Darwin's theory of evolution based on natural selection.

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Heredity

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Pregunta 36 Informe

Which of the following is involved in secondary thickening in plants?

Collenchyma and xylem cells

Vascular cambium

Cork cambium and sclerenchyma

Vascular cambium and cork cambium

Detalles de la respuesta

Secondary thickening in plants is primarily caused by the activity of the vascular cambium and the cork cambium. The vascular cambium is a layer of cells located between the xylem (the tissue responsible for transporting water and minerals from roots to the rest of the plant) and the phloem (the tissue responsible for transporting sugars and other organic compounds). The vascular cambium produces new cells that increase the diameter of the stem or root, leading to secondary growth and increased thickness. The cork cambium, on the other hand, produces cork cells that form a protective outer layer on the plant. This helps to prevent water loss and protect the plant from damage. Over time, as more cork cells are produced, the plant becomes thicker and more durable. In summary, both the vascular cambium and cork cambium are involved in secondary thickening in plants, with the vascular cambium increasing the diameter of the stem or root and the cork cambium producing a protective outer layer.

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Nutrition

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Pregunta 37 Informe

Which of the following is true in blood transfusion?

person of blood group AB can donate blood only to another person of blood group AB

persons of blood groups A and B can donate or receive blood from each other

A person of blood group AB acn receive blood only from persons of blood group A or B

A person of blood group O can donate only to a person of blood group O

Detalles de la respuesta

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Crime Detection

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Pregunta 38 Informe

The water cycle is maintained mainly by

evaporation of water in the environment

evaporation and condensation of water in the environment

condensation of water in the environment

transpiration and respiration in plants

Detalles de la respuesta

The water cycle, also known as the hydrological cycle, is maintained by the processes of evaporation, condensation, and precipitation. Water from oceans, lakes, rivers, and other bodies of water evaporates due to the sun's heat. This water vapor then rises into the atmosphere, where it cools and condenses to form clouds. As these clouds become heavier, the condensed water droplets fall back to the earth as precipitation in the form of rain, snow, sleet, or hail. Some of this precipitation infiltrates the ground to replenish groundwater supplies, while the rest flows over the land into rivers, lakes, and oceans, completing the cycle. Therefore, the water cycle is maintained mainly by the processes of evaporation and condensation of water in the environment, which constantly move water between the earth's surface and the atmosphere.

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Nitrogen Cycle

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Pregunta 39 Informe

From his study of Galapagos finches, Darwin derived his theory of evolution from

comparative anatomy

comparative physiology

fossil remains

comparative embryology

Detalles de la respuesta

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Lee la nota de la lección en Evidence Of Evolution (JAMB)

Lee la nota de la lección en Heredity (JAMB)

Evolution (Theories and Evidence)

Evidence Of Evolution

Heredity

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Pregunta 40 Informe

The autonomic nervous system consists of neurons that control the

voluntary muscles

heart beat

tongue

hands

Detalles de la respuesta

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Pregunta 41 Informe

Plant growth can be artificially stimulated by the addition of

gibberellin

kinin

abscisic acid

ethylene

Detalles de la respuesta

Plant growth can be artificially stimulated by the addition of gibberellin. Gibberellin is a type of plant hormone that plays a role in promoting cell division and elongation, leading to an increase in plant height and overall growth. Gibberellin can also stimulate the production of flowers and fruits, and has been used commercially to increase yields in crops. By adding gibberellin to a plant, farmers and horticulturists can promote faster and more abundant growth, leading to improved crop production.

Lee la nota de la lección en Factors Affecting The Distribution Of Organisms (JAMB)

Lee la nota de la lección en The Ecology Of Populations (JAMB)

Factors Affecting The Distribution Of Organisms

The Ecology Of Populations

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Pregunta 42 Informe

The short thick break in birds is an adaptation for

crushing seeds

sucking nectar

tearing flash

straining mud

Detalles de la respuesta

The short, thick beak in birds is an adaptation for crushing seeds. Seeds are a common food source for many birds, and having a strong beak that can crack open the hard outer shell allows them to access the nutritious interior. This type of beak is called a "crushing beak" or "seed crusher beak."

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Pregunta 43 Informe

Use the diagram above to answer this question.

The function of the part labelled lll is to

produce egg cells

protect sperms during fertilization

secrete hormones during coitus

protect the developing embryo

Detalles de la respuesta

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Pregunta 44 Informe

The significance of a very large number of termites involved in nuptial swarming is to

provide birds with plenty of food

ensure their perpetuation despite predatory pressure

search for a favourable place to breed

ensure that every individual gets a mate

Detalles de la respuesta

Lee la nota de la lección en Respiration (JAMB)

Lee la nota de la lección en Support And Movement (JAMB)

Respiration

Support And Movement

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Pregunta 45 Informe

The most likely first colonizers of a bare rock are

mosses

ferns

lichen

fungi

Detalles de la respuesta

The most likely first colonizers of a bare rock are lichens. Lichens are a symbiotic relationship between a fungus and an alga or a cyanobacterium. They are well adapted to grow on bare rocks and can tolerate extreme temperatures, high radiation, and minimal nutrients. Lichens are capable of breaking down the rock surface through a process called chemical weathering. The acids produced by the lichen can dissolve minerals in the rock and create small crevices where organic matter can accumulate. These crevices provide a habitat for other organisms like mosses and ferns. Over time, as mosses and ferns establish themselves on the rock surface, they can trap more organic matter and create soil. This soil provides a better environment for larger plants like shrubs and trees to grow. In summary, lichens are the most likely first colonizers of a bare rock due to their ability to tolerate extreme conditions and break down the rock surface. As they create small crevices, other organisms like mosses and ferns can establish themselves, leading to the development of soil and the growth of larger plants.

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Pregunta 46 Informe

An arthropod that is destructive at early stage of its life cycle is

butterfly

mosquito

bee

millepede

Detalles de la respuesta

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Pregunta 47 Informe

Which of the following is most advanced in the evolutionary trend of animals?

Liverfluke

Earthworm

Snail

Cockroach

Detalles de la respuesta

Cockroach is most advanced in the evolutionary trend of animals among the given options. Evolutionary advancement in animals is a complex topic that involves several factors such as the development of complex organ systems, locomotion, sensory abilities, and other adaptations that allow animals to survive and thrive in their environments. Out of the given options, cockroaches are the most advanced in terms of evolutionary trend because they possess several characteristics that have allowed them to adapt and survive for over 300 million years. Cockroaches have a complex nervous system that allows them to sense their environment and respond to stimuli quickly. They have the ability to fly or run very quickly, which is a valuable adaptation for escaping predators. Furthermore, cockroaches have a hard exoskeleton that protects them from physical harm and desiccation. They also have the ability to live in a variety of environments, including human dwellings, which has contributed to their evolutionary success. In contrast, liver flukes, earthworms, and snails, while important organisms in their respective ecosystems, do not possess the same level of evolutionary advancement as cockroaches. Liver flukes are parasitic flatworms that have a simple body plan, while earthworms and snails have a more complex body plan, but lack some of the advanced adaptations of cockroaches. Therefore, based on these characteristics, it can be concluded that cockroach is most advanced in the evolutionary trend of animals among the given options.

Lee la nota de la lección en Evolution (Theories and Evidence) (WAEC)

Evolution (Theories and Evidence)

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Pregunta 48 Informe

The diseases caused by water-borne pathogens include

gonorrhoea and poliomyelitis

typhoid and syphilis

tuberculosis and cholera

typhoid and cholera

Detalles de la respuesta

The diseases caused by water-borne pathogens mainly include typhoid and cholera. When water sources such as rivers, lakes or wells are contaminated with the bacteria or viruses that cause these diseases, they can spread to people who consume the contaminated water or use it for cooking, washing or bathing. Typhoid is caused by the bacterium Salmonella typhi, which is spread through contaminated food or water. Symptoms include fever, headache, stomach pain and diarrhea. Cholera is caused by the bacterium Vibrio cholerae, which is also spread through contaminated food or water. Symptoms include severe diarrhea and vomiting, which can quickly lead to dehydration and even death if left untreated. While other diseases such as tuberculosis and poliomyelitis can also be spread through water-borne pathogens, the most common and well-known ones are typhoid and cholera. It is important to ensure that drinking water is clean and safe to prevent the spread of these and other water-borne diseases.

Lee la nota de la lección en Transport System (WAEC)

Lee la nota de la lección en Classification (WAEC)

Transport System

Classification

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Pregunta 49 Informe

In plants which of the following is required in minute quantities for growth?

Copper

Potassium

Phosphorus

Sodium

Detalles de la respuesta

Copper is required in minute quantities for the growth of plants. It is an essential micronutrient that plays a critical role in several plant processes such as photosynthesis, respiration, and the metabolism of carbohydrates and proteins. Despite being required in small amounts, copper deficiency can have a significant impact on plant growth and development. Without enough copper, plants can exhibit stunted growth, wilting, chlorosis (yellowing of leaves), and reduced fertility. In summary, while all of the nutrients listed are important for plant growth, copper is the one that is required in minute quantities for optimal growth and development.

Lee la nota de la lección en Microorganisms Around Us (WAEC)

Microorganisms Around Us

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