JAMB UTME - Biology - 2008 | Green Bridge CBT

Swali 1 Ripoti

The Rhesus factor of blood was first identified in a category of

monkeys Jibu sahihi

human females

human males

chimpanzees

Maelezo ya Majibu

The Rhesus factor of blood was first identified in a category of monkeys.

Soma maelezo ya somo kwenye Heredity (JAMB)

Heredity

Tazama Jibu

Swali 2 Ripoti

Use the diagram above to answer this question.

Water reabsorption takes place in

ll and lll

lll and lV Jibu sahihi

l and IV

l and lll

Maelezo ya Majibu

Water reabsorption takes place in regions lll and lV of the nephron. The loop of Henle, located in regions l and ll, is responsible for the concentration of the urine by establishing an osmotic gradient in the medulla of the kidney. The collecting duct, located in regions lll and lV, is where the final adjustment of urine concentration occurs, and this is where water is reabsorbed back into the bloodstream. Therefore, the correct answer is lll and lV.

Tazama Jibu

Swali 3 Ripoti

Radial symmetry is a future common to

platyhelminthes

nematodes

coelenterates Jibu sahihi

arthropods

Maelezo ya Majibu

Radial symmetry is a feature common to coelenterates. Coelenterates are a group of aquatic animals that include jellyfish, coral, and sea anemones. They exhibit radial symmetry, which means their body parts are arranged around a central axis like spokes on a wheel. This allows them to move in any direction and efficiently capture prey from any angle.

Soma maelezo ya somo kwenye Organization Of Life (WAEC)

Soma maelezo ya somo kwenye Classification (WAEC)

Organization Of Life

Classification

Tazama Jibu

Swali 4 Ripoti

In the mammalian kidney, the Bowman''s capsules is located in the

ureter

pelvis

cortex Jibu sahihi

medulla

Maelezo ya Majibu

Soma maelezo ya somo kwenye Excretory Systems And Mechanisms; Types Of Excretory Systems (WAEC)

Soma maelezo ya somo kwenye Natural Habitats (JAMB)

Excretory Systems And Mechanisms; Types Of Excretory Systems

Natural Habitats

Tazama Jibu

Swali 5 Ripoti

The bacteria type that are arranged in chains are the

staphylococci

clostidia

streptococci Jibu sahihi

basilli

Maelezo ya Majibu

Bacteria are unicellular microorganisms that exist in different shapes and arrangements. Streptococci are a type of bacteria that are arranged in chains, as the name suggests. These bacteria are spherical or oval-shaped and occur in chains due to their mode of cell division. Streptococci are known to cause a variety of infections in humans, including strep throat, pneumonia, and meningitis.

Soma maelezo ya somo kwenye Resources To Be Conserved: Soil, Water, Wildlife, Forest And Minerals (WAEC)

Soma maelezo ya somo kwenye Support And Movement (JAMB)

Resources To Be Conserved: Soil, Water, Wildlife, Forest And Minerals

Support And Movement

Tazama Jibu

Swali 6 Ripoti

In terms of the number of individuals, which of the following taxa is most inclusive?

order

family

class Jibu sahihi

species

Maelezo ya Majibu

Among the given options, "class" is the most inclusive taxon in terms of the number of individuals it includes. Taxonomy is the science of naming and classifying living organisms. Organisms are classified into different groups based on their characteristics, and each of these groups is called a taxon. The taxonomic hierarchy consists of several levels or ranks, with each level representing a different degree of similarity and relatedness among the organisms. Starting from the most inclusive to the least inclusive, the taxonomic hierarchy goes like this: kingdom, phylum, class, order, family, genus, and species. The "class" is a higher taxonomic rank or category than "order," "family," or "species." It is a group of related orders, and each class is made up of one or more orders. Thus, a class includes many orders, families, and species. For instance, the class "Mammalia" includes many orders such as primates, carnivores, rodents, and whales, among others. Each of these orders, in turn, includes several families, and each family includes several species. Therefore, "class" is the most inclusive of the given options.

Soma maelezo ya somo kwenye Co-ordination And Control (JAMB)

Co-ordination And Control

Tazama Jibu

Swali 7 Ripoti

In the diagram, the genotypic ratio of the offspring of the cross is

1:2

1:2:1 Jibu sahihi

1:1:1:1

3:1

Maelezo ya Majibu

Soma maelezo ya somo kwenye Application Of The Principles Of Heredity (WAEC)

Application Of The Principles Of Heredity

Tazama Jibu

Swali 8 Ripoti

In plants, the structure that performs a similar function with the testis in mammals is the

stigma

filament

anther Jibu sahihi

receptance

Maelezo ya Majibu

Soma maelezo ya somo kwenye Humans And Environment (JAMB)

Soma maelezo ya somo kwenye Spirogyra And Rhizopus (WAEC)

Humans And Environment

Spirogyra And Rhizopus

Tazama Jibu

Swali 9 Ripoti

A major adaptive feature of endoparasites is the

loss of the organ of movement

presence of claws

loss of the central nervous system

presence of piercing mouthparts Jibu sahihi

Maelezo ya Majibu

The major adaptive feature of endoparasites is the presence of piercing mouthparts. Endoparasites are parasites that live inside the body of their host, and to survive, they need to feed on the host's tissues or blood. The piercing mouthparts allow them to attach themselves to the host's tissues and feed on their fluids. This feature is an adaptation that helps endoparasites to obtain their necessary nutrients from their host while avoiding detection and expulsion by the host's immune system.

Soma maelezo ya somo kwenye Evolution (Theories and Evidence) (WAEC)

Soma maelezo ya somo kwenye Growth (JAMB)

Evolution (Theories and Evidence)

Growth

Tazama Jibu

Swali 10 Ripoti

Which of the following is a major cause of variation among organisms?

Inbreeding

Backcrossing

Sexual reproduction

Gene dominance Jibu sahihi

Maelezo ya Majibu

Soma maelezo ya somo kwenye Heredity (JAMB)

Heredity

Tazama Jibu

Swali 11 Ripoti

A characteristic that can possibly be shared by both living and non living organisms is

locomotion

irritability

increase in biomass Jibu sahihi

increase in size

Maelezo ya Majibu

Soma maelezo ya somo kwenye Irritability As A Basic Characteristic Of Protoplasm (WAEC)

Irritability As A Basic Characteristic Of Protoplasm

Tazama Jibu

Swali 12 Ripoti

Which of the following associations is an example of mutualism

hydra viridis and zoochlorellae Jibu sahihi

human and lice

shark and remora fish

bread and rhizopus stolonifer

Maelezo ya Majibu

The association that is an example of mutualism is hydra viridis and zoochlorellae. In mutualism, both organisms benefit from the relationship. Hydra viridis, a freshwater invertebrate, harbors zoochlorellae, which are single-celled green algae that live inside its cells. The algae produce food through photosynthesis, which benefits both the algae and the hydra. The hydra, in turn, provides a protected environment and nutrients to the algae. Therefore, both organisms benefit from the association, making it an example of mutualism. The other options are not examples of mutualism; they are parasitic or commensal relationships.

Soma maelezo ya somo kwenye Symbiotic Interactions Of Plants And Animals (JAMB)

Symbiotic Interactions Of Plants And Animals

Tazama Jibu

Swali 13 Ripoti

Use the diagram above to answer this question.

From the graph above, it can be appropriately deduced that

the body temperature in ll varies with that in l

the body of temperature in l is independent of external temperature Jibu sahihi

l and ll maintain constant body temperature

external temperatures affect the body temperature of l and ll

Maelezo ya Majibu

The graph represents two lines, one for body temperature in "l" and another for body temperature in "ll" over a period of time. The lines fluctuate up and down in response to changes in external temperature. Therefore, it can be appropriately deduced that external temperatures affect the body temperature of l and ll.

Soma maelezo ya somo kwenye Adaptation For Survival (WAEC)

Soma maelezo ya somo kwenye Co-ordination And Control (JAMB)

Adaptation For Survival

Co-ordination And Control

Tazama Jibu

Swali 14 Ripoti

In the diagram, which of the four offspring of the cross will be sort if T the gene for tallness is

III

IV Jibu sahihi

Maelezo ya Majibu

Soma maelezo ya somo kwenye Heredity (JAMB)

Heredity

Tazama Jibu

Swali 15 Ripoti

Stomata of some plants are sunken and protected by hairs. These are features of

mesophytes

epiphytes

hydrophytes

xerophytes Jibu sahihi

Maelezo ya Majibu

Tazama Jibu

Swali 16 Ripoti

Use the diagram above to answer this question.

The type of reproduction illustrated in IV is

sexual

conjugation

binary fission

budding Jibu sahihi

Maelezo ya Majibu

The type of reproduction illustrated in IV is budding. Budding is a form of asexual reproduction in which a new individual develops from an outgrowth or bud from the parent organism. In the diagram, a small outgrowth or bud is developing from the parent organism, which will eventually detach and become a new individual. This process is characteristic of organisms like hydra, yeast, and some sponges.

Soma maelezo ya somo kwenye Organization Of Life (WAEC)

Soma maelezo ya somo kwenye Reproduction (JAMB)

Soma maelezo ya somo kwenye Reproduction (Physical Changes In Males And Females) (WAEC)

Organization Of Life

Reproduction

Reproduction (Physical Changes In Males And Females)

Tazama Jibu

Swali 17 Ripoti

A plant parenchyma cell also acts as a supporting tissue when it

becomes flaccid

contains crystals

becomes turgid Jibu sahihi

is pigmented

Maelezo ya Majibu

When a plant parenchyma cell becomes turgid, it also acts as a supporting tissue. Turgidity refers to the state of the cell when it is fully hydrated and swollen, which causes it to be rigid and provide structural support to the plant. When a plant cell loses water and becomes flaccid, it cannot provide support to the plant. The presence of crystals or pigmentation in the cell does not necessarily affect its ability to act as a supporting tissue.

Tazama Jibu

Swali 18 Ripoti

The order of passage of food in the digestive system is?

ileum → caecum → large intestine → rectum Jibu sahihi

ileum → colon → caecum →rectum

large intestine →ileum → caecum →rectum

colon → caecum → ileum →rectum

Maelezo ya Majibu

Soma maelezo ya somo kwenye Alimentary System (WAEC)

Alimentary System

Tazama Jibu

Swali 19 Ripoti

What will happen wen two equal sized pieces of unripe pawpaw labelled X and Y are dropped into equal volumes of concentrated salt solution and distilled water respectively?

pawpaw X will become turgid

both will increase in size

pawpaw Y will become turgid Jibu sahihi

both will decrease in size

Maelezo ya Majibu

Tazama Jibu

Swali 20 Ripoti

A boy who is fond of swimming in a pond finds himself passing urine with traces of blood. He is likely to have contacted

schistosomiasis Jibu sahihi

onchocerciasis

poliomyelitis

salmonellosis

Maelezo ya Majibu

Soma maelezo ya somo kwenye Animal Nutrition (WAEC)

Soma maelezo ya somo kwenye Excretory Systems And Mechanisms; Types Of Excretory Systems (WAEC)

Animal Nutrition

Excretory Systems And Mechanisms; Types Of Excretory Systems

Tazama Jibu

Swali 21 Ripoti

The easiest way to establish the level of pollution in a local stream is to measure the level of

oxygen Jibu sahihi

carbon (IV) oxide

ammonia

alkalinity

Maelezo ya Majibu

The easiest way to establish the level of pollution in a local stream is to measure the level of oxygen. Oxygen is essential for the survival of aquatic life, and the presence of pollutants in the water can decrease the amount of dissolved oxygen. By measuring the oxygen level, we can determine if the water is polluted or not. If the oxygen level is low, it indicates that there is pollution in the water, and the quality of the water is poor. Carbon (IV) oxide, ammonia, and alkalinity are also important parameters to measure, but they may not provide a clear indication of pollution as their levels can fluctuate due to natural processes.

Soma maelezo ya somo kwenye Relevance Of Biology To Agriculture (WAEC)

Relevance Of Biology To Agriculture

Tazama Jibu

Swali 22 Ripoti

In the diagram, the illustration is a typical example of a plant pollinated by

wind Jibu sahihi

man

insects

birds

Maelezo ya Majibu

Tazama Jibu

Swali 23 Ripoti

The natural process that produces adaptive evolutionary changes is

Mutation

Gene flow

Genetic drift

Natural selection

Jibu sahihi

Maelezo ya Majibu

Natural selection is the natural process that produces adaptive evolutionary changes. It is the process where organisms that are better adapted to their environment are more likely to survive and reproduce, passing on their advantageous traits to their offspring. Over time, this can lead to changes in the frequency of traits within a population, which can result in the development of new species. Therefore, natural selection is a fundamental mechanism of evolution.

Soma maelezo ya somo kwenye Heredity (JAMB)

Heredity

Tazama Jibu

Swali 24 Ripoti

The transmission of impulses along a nerve fibre is characterized by

hormonal and temperature changes

electrical and ionic changes Jibu sahihi

hormonal and changes

electrostatic changes

Maelezo ya Majibu

The transmission of impulses along a nerve fibre is characterized by electrical and ionic changes. When a nerve impulse is generated, there is a temporary reversal in the electrical charge across the cell membrane, causing a wave of electrical current to travel along the nerve fibre. This electrical signal opens up voltage-gated ion channels in the membrane, allowing ions to flow in and out of the cell, which creates a flow of electrical current. This ionic exchange produces a new electrical signal in the next section of the membrane, allowing the impulse to travel down the nerve fibre. Therefore, electrical and ionic changes are the main characteristics of the transmission of impulses along a nerve fibre.

Soma maelezo ya somo kwenye Evidence Of Evolution (JAMB)

Soma maelezo ya somo kwenye Nervous Coordination (WAEC)

Evidence Of Evolution

Nervous Coordination

Tazama Jibu

Swali 25 Ripoti

In an experiment to determine the percentage of air in a soil sample, the following readings were recorded: volume of water in measuring cylinder = 500 cm3volume of soil added to water = 350 cm3volume of water and soil after stirring = 800 cm3the percentage of air in the soil sample is

6.25% Jibu sahihi

10.36%

14.28%

43.28%

Maelezo ya Majibu

volume of air in the soil = (350 + 500) - 800
= 850 - 800 = 50 cm3
% of air in the soil = (volume of air)/total volume x (100)/1 = (50)/800 x 100 = 6.25%

Tazama Jibu

Swali 26 Ripoti

Use the diagram above to answer this question.

The vessel that carries blood from l to ll is the

pulmonary artery Jibu sahihi

pulmonary vein

carotid artery

jugular vein

Maelezo ya Majibu

The vessel that carries blood from l to ll is the pulmonary artery. This is because the pulmonary artery is the vessel that carries deoxygenated blood from the heart to the lungs, where it gets oxygenated. The oxygenated blood is then carried back to the heart by the pulmonary vein. The carotid artery and jugular vein are not involved in this specific circulation pathway.

Tazama Jibu

Swali 27 Ripoti

The major consequences of bush burning in an ecosystem is

the loss of water

the loss of biological diversity Jibu sahihi

a decrease in animal population

an increase in soil fertility

Maelezo ya Majibu

Bush burning has major consequences on an ecosystem, one of which is the loss of biological diversity. This is because bush burning destroys habitats and food sources for organisms, resulting in a decline in their population. Additionally, bush burning can also lead to the loss of soil fertility as it destroys the organic matter that supports plant growth. The burning of plants can also release carbon dioxide into the atmosphere, contributing to climate change. Therefore, bush burning can have significant negative impacts on the environment and should be avoided where possible.

Soma maelezo ya somo kwenye Ecosystem (WAEC)

Ecosystem

Tazama Jibu

Swali 28 Ripoti

An ecological factor that will have the most limiting effects on the abundance of phytoplankton in a turbid pond is

oxygen

light Jibu sahihi

temperature

Maelezo ya Majibu

Soma maelezo ya somo kwenye Soil (JAMB)

Soma maelezo ya somo kwenye Relevance Of Biology To Agriculture (WAEC)

Soma maelezo ya somo kwenye Ecological Factors (WAEC)

Soma maelezo ya somo kwenye Ecosystem (WAEC)

Soil

Relevance Of Biology To Agriculture

Ecological Factors

Ecosystem

Tazama Jibu

Swali 29 Ripoti

Genetically modified food products have not become universally accepted because

they are not tasty as others produced by conventional means

they are usually costlier than others produced by conventional means

their effects on human consumers is not yet fully understand Jibu sahihi

the technology can be applied only in developed countries

Maelezo ya Majibu

Soma maelezo ya somo kwenye Variation In Population (JAMB)

Soma maelezo ya somo kwenye Evidence Of Evolution (JAMB)

Soma maelezo ya somo kwenye Heredity (JAMB)

Variation In Population

Evidence Of Evolution

Heredity

Tazama Jibu

Swali 30 Ripoti

The main ecological problem facing intertidal organisms is

desiccation

floatation Jibu sahihi

salinity

humidity

Maelezo ya Majibu

Tazama Jibu

Swali 31 Ripoti

The most important characteristic that makes reptiles to conquer terrestrial habitats is the possession of

long tail

scaly skin

sharp claw

amniotic egg Jibu sahihi

Maelezo ya Majibu

The possession of amniotic eggs is the most important characteristic that makes reptiles conquer terrestrial habitats. The amniotic egg is an egg with a protective membrane that allows the embryo to develop in a self-contained aquatic environment, without the need for the egg to be laid in water. This adaptation allows reptiles to lay their eggs on land, which increases their chances of survival since the eggs are protected from water-borne predators. The amniotic egg also allows reptiles to live in areas that are far away from water bodies. This adaptation, therefore, allows reptiles to occupy terrestrial habitats where they can move around freely, hunt, and reproduce.

Soma maelezo ya somo kwenye Plant Nutrition (WAEC)

Plant Nutrition

Tazama Jibu

Swali 32 Ripoti

The abilty of a chameleon to change its colour is an adaptive future for

attraction

defence Jibu sahihi

display

attack

Maelezo ya Majibu

The ability of a chameleon to change its color is an adaptive feature for defense. Chameleons can change their color to blend in with their surroundings, making it harder for predators to spot them. Additionally, they can change their color to reflect their mood or to communicate with other chameleons, but defense is the primary reason for their color-changing ability. By blending in with their environment, chameleons can avoid being seen and increase their chances of survival.

Soma maelezo ya somo kwenye Adaptive Colouration (WAEC)

Adaptive Colouration

Tazama Jibu

Swali 33 Ripoti

Use the diagram above to answer this question. The male inflorescence is labelled

I Jibu sahihi

III

Maelezo ya Majibu

Soma maelezo ya somo kwenye Internal Structure Of A Flowering Plant (JAMB)

Internal Structure Of A Flowering Plant

Tazama Jibu

Swali 34 Ripoti

Which of the following is the most advanced evolutionary development in plants?

possession of unicellular structures

development of flowers Jibu sahihi

dispersal of spores

development of secondary thickening

Maelezo ya Majibu

The most advanced evolutionary development in plants is the development of flowers. Flowers are the reproductive structures of angiosperms (flowering plants), which are the most diverse and advanced group of plants. Flowers have evolved to attract pollinators, which aid in fertilization and increase genetic diversity. Therefore, the development of flowers is considered an advanced evolutionary adaptation in plants.

Soma maelezo ya somo kwenye Local (Nigerian) Biomes (JAMB)

Soma maelezo ya somo kwenye Variation In Population (JAMB)

Soma maelezo ya somo kwenye Evolution (Theories and Evidence) (WAEC)

Soma maelezo ya somo kwenye Factors Affecting The Distribution Of Organisms (JAMB)

Local (Nigerian) Biomes

Variation In Population

Evolution (Theories and Evidence)

Factors Affecting The Distribution Of Organisms

Tazama Jibu

Swali 35 Ripoti

Use the diagram above to answer this question.

Which of the organisms is characterized by the possession of a chitinous exoskeleton?

I Jibu sahihi

III

Maelezo ya Majibu

Soma maelezo ya somo kwenye Forms In Which Living Cells Exist (WAEC)

Forms In Which Living Cells Exist

Tazama Jibu

Swali 36 Ripoti

In the diagram, the population size of species II on the 20th day is

100

200 Jibu sahihi

300

400

Maelezo ya Majibu

The population size of species II on the 20th day is 200. This is because the line representing species II intersects the y-axis at 200, indicating the initial population size, and then crosses the x-axis at the 20th day, showing that the population size has reached zero. Therefore, the population size of species II on the 20th day is 200.

Soma maelezo ya somo kwenye Co-ordination And Control (JAMB)

Co-ordination And Control

Tazama Jibu

Swali 37 Ripoti

In the alimentary system of a bird, the function of teeth is carried out by the

crop

beak

gizzard Jibu sahihi

tongue

Maelezo ya Majibu

Soma maelezo ya somo kwenye Alimentary System (WAEC)

Alimentary System

Tazama Jibu

Swali 38 Ripoti

In a typical freshwater habitat, the edge of the stream or pond constitutes the

tidal zone

intertidal zone

littoral zone Jibu sahihi

euphotic zone

Maelezo ya Majibu

The edge of a freshwater habitat, such as a stream or pond, is called the "littoral zone." This is the shallow area where light penetrates all the way to the bottom, allowing aquatic plants to grow and providing habitat for a variety of animals, such as insects, fish, and amphibians. The littoral zone is an important part of the freshwater ecosystem, and plays a crucial role in nutrient cycling and maintaining water quality.

Soma maelezo ya somo kwenye The Cell And Its Environment: Physical And Biophysical Processes (WAEC)

Soma maelezo ya somo kwenye Ecological Factors (WAEC)

The Cell And Its Environment: Physical And Biophysical Processes

Ecological Factors

Tazama Jibu

Swali 39 Ripoti

The cell of an onion bulb can be differentiated from a cheek cell by the presence of

plasmalemma

chloroplast

cell wall Jibu sahihi

nucleus

Maelezo ya Majibu

Soma maelezo ya somo kwenye Cell Structure (WAEC)

Cell Structure

Tazama Jibu

Swali 40 Ripoti

In the diagram, if species i, ii and iii interact in a community, which of the following statement is true?

the population of species ii is growing at a slow rate

the population of species iii has reached its carrying capscity?

the population of species I has become extinct Jibu sahihi

the population of species I is always

Maelezo ya Majibu

Soma maelezo ya somo kwenye Ecology Of Population (WAEC)

Soma maelezo ya somo kwenye Factors Affecting The Distribution Of Organisms (JAMB)

Ecology Of Population

Factors Affecting The Distribution Of Organisms

Tazama Jibu

Swali 41 Ripoti

Which of the following is used mainly for balancing in fish?

the caudal fin

the pectoral fin

the anal fin

the dorsal fin Jibu sahihi

Maelezo ya Majibu

The fin that is mainly used for balancing in fish is the dorsal fin. The dorsal fin is located on the top of the fish's body and helps to keep the fish stable while swimming. It also helps to prevent the fish from rolling over in the water. While the other fins, such as the pectoral, caudal, and anal fins, also assist in swimming and maneuvering, the dorsal fin specifically plays a role in balancing the fish.

Tazama Jibu

Swali 42 Ripoti

During ovulation, an egg is released from the

corpus luteum

ovarian funnel

graafian follicle Jibu sahihi

fallopian tube

Maelezo ya Majibu

Tazama Jibu

Swali 43 Ripoti

In the diagram, the part labelled IV indicated that the yeast population has

reached its maximum size Jibu sahihi

reached senescence

stopped metabolizing food

started dying

Maelezo ya Majibu

The part labelled IV in the diagram indicates that the yeast population has reached its maximum size. This is because the growth curve of the yeast population reaches a plateau at this point, which suggests that the population has reached its carrying capacity and can no longer sustain further growth.

Soma maelezo ya somo kwenye Co-ordination And Control (JAMB)

Co-ordination And Control

Tazama Jibu

Swali 44 Ripoti

insectivorous plants traps and kill their prey to derive

phosphorous

calcium

nitrogen Jibu sahihi

zinc

Maelezo ya Majibu

Insectivorous plants, as the name suggests, feed on insects. These plants trap and kill insects using different mechanisms, such as sticky surfaces or snap traps. Once the prey is captured, the plant releases enzymes that digest the insect's body and extract nutrients, including nitrogen. Therefore, the correct answer is nitrogen.

Soma maelezo ya somo kwenye Classification (WAEC)

Classification

Tazama Jibu

Swali 45 Ripoti

The beak of a duck is structurally adapted for

scooping and sieving food Jibu sahihi

catching and grasping food

picking and cracking food

boring and sucking food

Maelezo ya Majibu

Soma maelezo ya somo kwenye Respiration (JAMB)

Soma maelezo ya somo kwenye Adaptive Colouration (WAEC)

Respiration

Adaptive Colouration

Tazama Jibu

Swali 46 Ripoti

Use the diagram above to answer this question.

The animal represented by l is a

poikilotherm

homoiotherm Jibu sahihi

carnivore

herbivore

Maelezo ya Majibu

Tazama Jibu

Swali 47 Ripoti

Exhaled air differs from inhaled air in that it

less amount of carbon(IV) oxide

is usually lower in temperature

often has more oxygen

usually has more water vapour Jibu sahihi

Maelezo ya Majibu

Exhaled air differs from inhaled air in that it usually has more carbon dioxide and more water vapor. When we breathe in, we inhale oxygen and exhale carbon dioxide. The exhaled air also contains moisture from the lungs, which can make it slightly warmer and more humid than the inhaled air. Therefore, the correct option is "usually has more water vapor" and "less amount of oxygen".

Soma maelezo ya somo kwenye Respiratory System (WAEC)

Respiratory System

Tazama Jibu

Swali 48 Ripoti

In the diagram, the part labelled I represents the

stationary phase

lag phase Jibu sahihi

log phase

steady phase

Maelezo ya Majibu

The part labelled I in the diagram refers to the "lag phase". The lag phase is the first phase of bacterial growth where the bacteria are adjusting to their new environment, synthesizing new components and increasing in size, but not yet dividing. During this phase, there is little to no increase in the number of bacteria. Once the bacteria have adapted and are ready to divide, they enter the log phase, which is the phase of rapid exponential growth.

Soma maelezo ya somo kwenye Classification (WAEC)

Soma maelezo ya somo kwenye Excretory Systems And Mechanisms; Types Of Excretory Systems (WAEC)

Soma maelezo ya somo kwenye Properties And Functions Of The Living Cell (WAEC)

Soma maelezo ya somo kwenye Respiratory System (WAEC)

Classification

Excretory Systems And Mechanisms; Types Of Excretory Systems

Properties And Functions Of The Living Cell

Respiratory System

Tazama Jibu

Swali 49 Ripoti

The most abundant group of organisms in the animal kingdom is

mammalia

aves

annelida

insecta Jibu sahihi

Maelezo ya Majibu

Tazama Jibu

Swali 50 Ripoti

In a dicotyledonous stem, the zone between the epidermis and the pericycle is the

cortex Jibu sahihi

stele

xylem

ploem

Maelezo ya Majibu

The zone between the epidermis and the pericycle in a dicotyledonous stem is known as the cortex. The cortex is composed of several layers of parenchyma cells, which store food and provide mechanical support to the stem. It also contains collenchyma cells, which provide additional support to the stem. The cortex is important for the exchange of gases and water between the stem and the environment.

Soma maelezo ya somo kwenye Nutrition (JAMB)

Soma maelezo ya somo kwenye Morphology Of Monocotyledonous And Dicotyledonous Plants (WAEC)

Nutrition

Morphology Of Monocotyledonous And Dicotyledonous Plants

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