JAMB UTME - Biology - 2008 | Green Bridge CBT

Ibeere 1 Ìròyìn

The main ecological problem facing intertidal organisms is

desiccation

floatation Ìdáhùn tó tọ́

salinity

humidity

Awọn alaye Idahun

Wo Idahun

Ibeere 2 Ìròyìn

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

III

IV Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Heredity (JAMB)

Heredity

Wo Idahun

Ibeere 3 Ìròyìn

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

100

200 Ìdáhùn tó tọ́

300

400

Awọn alaye Idahun

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.

Ka ìwé ẹ̀kọ́ nípa Co-ordination And Control (JAMB)

Co-ordination And Control

Wo Idahun

Ibeere 4 Ìròyìn

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

oxygen Ìdáhùn tó tọ́

carbon (IV) oxide

ammonia

alkalinity

Awọn alaye Idahun

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.

Ka ìwé ẹ̀kọ́ nípa Relevance Of Biology To Agriculture (WAEC)

Relevance Of Biology To Agriculture

Wo Idahun

Ibeere 5 Ìròyìn

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

order

family

class Ìdáhùn tó tọ́

species

Awọn alaye Idahun

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.

Ka ìwé ẹ̀kọ́ nípa Co-ordination And Control (JAMB)

Co-ordination And Control

Wo Idahun

Ibeere 6 Ìròyìn

Use the diagram above to answer this question.

The type of reproduction illustrated in IV is

sexual

conjugation

binary fission

budding Ìdáhùn tó tọ́

Awọn alaye Idahun

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.

Ka ìwé ẹ̀kọ́ nípa Organization Of Life (WAEC)

Ka ìwé ẹ̀kọ́ nípa Reproduction (JAMB)

Ka ìwé ẹ̀kọ́ nípa Reproduction (Physical Changes In Males And Females) (WAEC)

Organization Of Life

Reproduction

Reproduction (Physical Changes In Males And Females)

Wo Idahun

Ibeere 7 Ìròyìn

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

wind Ìdáhùn tó tọ́

man

insects

birds

Awọn alaye Idahun

Wo Idahun

Ibeere 8 Ìròyìn

Which of the following associations is an example of mutualism

hydra viridis and zoochlorellae Ìdáhùn tó tọ́

human and lice

shark and remora fish

bread and rhizopus stolonifer

Awọn alaye Idahun

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.

Ka ìwé ẹ̀kọ́ nípa Symbiotic Interactions Of Plants And Animals (JAMB)

Symbiotic Interactions Of Plants And Animals

Wo Idahun

Ibeere 9 Ìròyìn

The bacteria type that are arranged in chains are the

staphylococci

clostidia

streptococci Ìdáhùn tó tọ́

basilli

Awọn alaye Idahun

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.

Ka ìwé ẹ̀kọ́ nípa Resources To Be Conserved: Soil, Water, Wildlife, Forest And Minerals (WAEC)

Ka ìwé ẹ̀kọ́ nípa Support And Movement (JAMB)

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

Support And Movement

Wo Idahun

Ibeere 10 Ìròyìn

Use the diagram above to answer this question.

Water reabsorption takes place in

ll and lll

lll and lV Ìdáhùn tó tọ́

l and IV

l and lll

Awọn alaye Idahun

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.

Wo Idahun

Ibeere 11 Ìròyìn

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

stigma

filament

anther Ìdáhùn tó tọ́

receptance

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Humans And Environment (JAMB)

Ka ìwé ẹ̀kọ́ nípa Spirogyra And Rhizopus (WAEC)

Humans And Environment

Spirogyra And Rhizopus

Wo Idahun

Ibeere 12 Ìròyìn

The natural process that produces adaptive evolutionary changes is

Mutation

Gene flow

Genetic drift

Natural selection

Ìdáhùn tó tọ́

Awọn alaye Idahun

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.

Ka ìwé ẹ̀kọ́ nípa Heredity (JAMB)

Heredity

Wo Idahun

Ibeere 13 Ìròyìn

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

becomes flaccid

contains crystals

becomes turgid Ìdáhùn tó tọ́

is pigmented

Awọn alaye Idahun

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.

Wo Idahun

Ibeere 14 Ìròyìn

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

possession of unicellular structures

development of flowers Ìdáhùn tó tọ́

dispersal of spores

development of secondary thickening

Awọn alaye Idahun

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.

Ka ìwé ẹ̀kọ́ nípa Local (Nigerian) Biomes (JAMB)

Ka ìwé ẹ̀kọ́ nípa Variation In Population (JAMB)

Ka ìwé ẹ̀kọ́ nípa Evolution (Theories and Evidence) (WAEC)

Ka ìwé ẹ̀kọ́ nípa Factors Affecting The Distribution Of Organisms (JAMB)

Local (Nigerian) Biomes

Variation In Population

Evolution (Theories and Evidence)

Factors Affecting The Distribution Of Organisms

Wo Idahun

Ibeere 15 Ìròyìn

insectivorous plants traps and kill their prey to derive

phosphorous

calcium

nitrogen Ìdáhùn tó tọ́

zinc

Awọn alaye Idahun

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.

Ka ìwé ẹ̀kọ́ nípa Classification (WAEC)

Classification

Wo Idahun

Ibeere 16 Ìròyìn

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

crop

beak

gizzard Ìdáhùn tó tọ́

tongue

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Alimentary System (WAEC)

Alimentary System

Wo Idahun

Ibeere 17 Ìròyìn

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 Ìdáhùn tó tọ́

onchocerciasis

poliomyelitis

salmonellosis

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Animal Nutrition (WAEC)

Ka ìwé ẹ̀kọ́ nípa Excretory Systems And Mechanisms; Types Of Excretory Systems (WAEC)

Animal Nutrition

Excretory Systems And Mechanisms; Types Of Excretory Systems

Wo Idahun

Ibeere 18 Ìròyìn

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

Inbreeding

Backcrossing

Sexual reproduction

Gene dominance Ìdáhùn tó tọ́

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Heredity (JAMB)

Heredity

Wo Idahun

Ibeere 19 Ìròyìn

The beak of a duck is structurally adapted for

scooping and sieving food Ìdáhùn tó tọ́

catching and grasping food

picking and cracking food

boring and sucking food

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Respiration (JAMB)

Ka ìwé ẹ̀kọ́ nípa Adaptive Colouration (WAEC)

Respiration

Adaptive Colouration

Wo Idahun

Ibeere 20 Ìròyìn

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 Ìdáhùn tó tọ́

Awọn alaye Idahun

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.

Ka ìwé ẹ̀kọ́ nípa Evolution (Theories and Evidence) (WAEC)

Ka ìwé ẹ̀kọ́ nípa Growth (JAMB)

Evolution (Theories and Evidence)

Growth

Wo Idahun

Ibeere 21 Ìròyìn

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

tidal zone

intertidal zone

littoral zone Ìdáhùn tó tọ́

euphotic zone

Awọn alaye Idahun

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.

Ka ìwé ẹ̀kọ́ nípa The Cell And Its Environment: Physical And Biophysical Processes (WAEC)

Ka ìwé ẹ̀kọ́ nípa Ecological Factors (WAEC)

The Cell And Its Environment: Physical And Biophysical Processes

Ecological Factors

Wo Idahun

Ibeere 22 Ìròyìn

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% Ìdáhùn tó tọ́

10.36%

14.28%

43.28%

Awọn alaye Idahun

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%

Wo Idahun

Ibeere 23 Ìròyìn

During ovulation, an egg is released from the

corpus luteum

ovarian funnel

graafian follicle Ìdáhùn tó tọ́

fallopian tube

Awọn alaye Idahun

Wo Idahun

Ibeere 24 Ìròyìn

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

the caudal fin

the pectoral fin

the anal fin

the dorsal fin Ìdáhùn tó tọ́

Awọn alaye Idahun

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.

Wo Idahun

Ibeere 25 Ìròyìn

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

1:2

1:2:1 Ìdáhùn tó tọ́

1:1:1:1

3:1

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Application Of The Principles Of Heredity (WAEC)

Application Of The Principles Of Heredity

Wo Idahun

Ibeere 26 Ìròyìn

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

reached its maximum size Ìdáhùn tó tọ́

reached senescence

stopped metabolizing food

started dying

Awọn alaye Idahun

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.

Ka ìwé ẹ̀kọ́ nípa Co-ordination And Control (JAMB)

Co-ordination And Control

Wo Idahun

Ibeere 27 Ìròyìn

In the diagram, the part labelled I represents the

stationary phase

lag phase Ìdáhùn tó tọ́

log phase

steady phase

Awọn alaye Idahun

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.

Ka ìwé ẹ̀kọ́ nípa Classification (WAEC)

Ka ìwé ẹ̀kọ́ nípa Excretory Systems And Mechanisms; Types Of Excretory Systems (WAEC)

Ka ìwé ẹ̀kọ́ nípa Properties And Functions Of The Living Cell (WAEC)

Ka ìwé ẹ̀kọ́ nípa Respiratory System (WAEC)

Classification

Excretory Systems And Mechanisms; Types Of Excretory Systems

Properties And Functions Of The Living Cell

Respiratory System

Wo Idahun

Ibeere 28 Ìròyìn

Use the diagram above to answer this question.

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

I Ìdáhùn tó tọ́

III

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Forms In Which Living Cells Exist (WAEC)

Forms In Which Living Cells Exist

Wo Idahun

Ibeere 29 Ìròyìn

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

cortex Ìdáhùn tó tọ́

stele

xylem

ploem

Awọn alaye Idahun

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.

Ka ìwé ẹ̀kọ́ nípa Nutrition (JAMB)

Ka ìwé ẹ̀kọ́ nípa Morphology Of Monocotyledonous And Dicotyledonous Plants (WAEC)

Nutrition

Morphology Of Monocotyledonous And Dicotyledonous Plants

Wo Idahun

Ibeere 30 Ìròyìn

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

mesophytes

epiphytes

hydrophytes

xerophytes Ìdáhùn tó tọ́

Awọn alaye Idahun

Wo Idahun

Ibeere 31 Ìròyìn

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

attraction

defence Ìdáhùn tó tọ́

display

attack

Awọn alaye Idahun

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.

Ka ìwé ẹ̀kọ́ nípa Adaptive Colouration (WAEC)

Adaptive Colouration

Wo Idahun

Ibeere 32 Ìròyìn

The major consequences of bush burning in an ecosystem is

the loss of water

the loss of biological diversity Ìdáhùn tó tọ́

a decrease in animal population

an increase in soil fertility

Awọn alaye Idahun

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.

Ka ìwé ẹ̀kọ́ nípa Ecosystem (WAEC)

Ecosystem

Wo Idahun

Ibeere 33 Ìròyìn

Use the diagram above to answer this question.

The animal represented by l is a

poikilotherm

homoiotherm Ìdáhùn tó tọ́

carnivore

herbivore

Awọn alaye Idahun

Wo Idahun

Ibeere 34 Ìròyìn

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 Ìdáhùn tó tọ́

both will decrease in size

Awọn alaye Idahun

Wo Idahun

Ibeere 35 Ìròyìn

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

locomotion

irritability

increase in biomass Ìdáhùn tó tọ́

increase in size

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Irritability As A Basic Characteristic Of Protoplasm (WAEC)

Irritability As A Basic Characteristic Of Protoplasm

Wo Idahun

Ibeere 36 Ìròyìn

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

oxygen

light Ìdáhùn tó tọ́

temperature

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Soil (JAMB)

Ka ìwé ẹ̀kọ́ nípa Relevance Of Biology To Agriculture (WAEC)

Ka ìwé ẹ̀kọ́ nípa Ecological Factors (WAEC)

Ka ìwé ẹ̀kọ́ nípa Ecosystem (WAEC)

Soil

Relevance Of Biology To Agriculture

Ecological Factors

Ecosystem

Wo Idahun

Ibeere 37 Ìròyìn

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

long tail

scaly skin

sharp claw

amniotic egg Ìdáhùn tó tọ́

Awọn alaye Idahun

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.

Ka ìwé ẹ̀kọ́ nípa Plant Nutrition (WAEC)

Plant Nutrition

Wo Idahun

Ibeere 38 Ìròyìn

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

ileum → caecum → large intestine → rectum Ìdáhùn tó tọ́

ileum → colon → caecum →rectum

large intestine →ileum → caecum →rectum

colon → caecum → ileum →rectum

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Alimentary System (WAEC)

Alimentary System

Wo Idahun

Ibeere 39 Ìròyìn

Radial symmetry is a future common to

platyhelminthes

nematodes

coelenterates Ìdáhùn tó tọ́

arthropods

Awọn alaye Idahun

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.

Ka ìwé ẹ̀kọ́ nípa Organization Of Life (WAEC)

Ka ìwé ẹ̀kọ́ nípa Classification (WAEC)

Organization Of Life

Classification

Wo Idahun

Ibeere 40 Ìròyìn

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 Ìdáhùn tó tọ́

the technology can be applied only in developed countries

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Variation In Population (JAMB)

Ka ìwé ẹ̀kọ́ nípa Evidence Of Evolution (JAMB)

Ka ìwé ẹ̀kọ́ nípa Heredity (JAMB)

Variation In Population

Evidence Of Evolution

Heredity

Wo Idahun

Ibeere 41 Ìròyìn

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 Ìdáhùn tó tọ́

l and ll maintain constant body temperature

external temperatures affect the body temperature of l and ll

Awọn alaye Idahun

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.

Ka ìwé ẹ̀kọ́ nípa Adaptation For Survival (WAEC)

Ka ìwé ẹ̀kọ́ nípa Co-ordination And Control (JAMB)

Adaptation For Survival

Co-ordination And Control

Wo Idahun

Ibeere 42 Ìròyìn

The transmission of impulses along a nerve fibre is characterized by

hormonal and temperature changes

electrical and ionic changes Ìdáhùn tó tọ́

hormonal and changes

electrostatic changes

Awọn alaye Idahun

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.

Ka ìwé ẹ̀kọ́ nípa Evidence Of Evolution (JAMB)

Ka ìwé ẹ̀kọ́ nípa Nervous Coordination (WAEC)

Evidence Of Evolution

Nervous Coordination

Wo Idahun

Ibeere 43 Ìròyìn

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

ureter

pelvis

cortex Ìdáhùn tó tọ́

medulla

Awọn alaye Idahun

Ka ìwé ẹ̀kọ́ nípa Excretory Systems And Mechanisms; Types Of Excretory Systems (WAEC)

Ka ìwé ẹ̀kọ́ nípa Natural Habitats (JAMB)

Excretory Systems And Mechanisms; Types Of Excretory Systems

Natural Habitats

Wo Idahun

Ibeere 44 Ìròyìn

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 Ìdáhùn tó tọ́

Awọn alaye Idahun

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".

Ka ìwé ẹ̀kọ́ nípa Respiratory System (WAEC)

Respiratory System

Wo Idahun

Ibeere 45 Ìròyìn

Use the diagram above to answer this question.

The vessel that carries blood from l to ll is the

pulmonary artery Ìdáhùn tó tọ́

pulmonary vein

carotid artery

jugular vein

Awọn alaye Idahun

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.

Wo Idahun

Ibeere 46 Ìròyìn

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

monkeys Ìdáhùn tó tọ́

human females

human males

chimpanzees

Awọn alaye Idahun

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

Ka ìwé ẹ̀kọ́ nípa Heredity (JAMB)

Heredity

Wo Idahun