JAMB UTME - Biology - 2022 | Green Bridge CBT

Question 1 Report

The part labelled II is?

pellicle

cytoplasmic connections

flagella

cells

Nucleic Acids

Cell Structure

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Question 2 Report

Succession that occurs on an abandoned farm land is?

tertiary

secondary

primary

climax

Answer Details

Succession that occurs on an abandoned farm land is referred to as secondary succession. Secondary succession is the process of change and development of plant and animal communities that occurs after a disturbance, such as a fire, flood, or human activity, has removed or altered the existing community. In the case of an abandoned farm land, the removal of crops, trees, and other vegetation, as well as the disturbance of the soil, creates an opportunity for new species to colonize the area and establish new communities. Over time, the community changes and evolves, eventually reaching a stable state known as the climax community. Primary succession, on the other hand, occurs in areas where there was previously no vegetation, such as newly formed volcanic islands or areas that have been covered by glaciers. In these areas, the first organisms to colonize the area are typically lichens, mosses, and other small plants that can tolerate the harsh conditions. As the community becomes more established, larger plants and animals move in, leading to the development of a more complex and diverse community. Tertiary succession is a less common type of succession that occurs on previously disturbed sites that have been abandoned for a longer period of time, such as old fields or abandoned industrial sites. In these cases, the community has already undergone secondary succession, but further changes and evolution may occur due to changes in the environment or the introduction of new species.

Read lesson note on Local (Nigerian) Biomes (JAMB)

Read lesson note on Natural Habitats (JAMB)

Local (Nigerian) Biomes

Natural Habitats

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Question 3 Report

In Nigeria, Southern Guinea Savanna is found in?

Borno and Sokoto

Kogi and Kwara

Kaduna and Cross River

Kano and Niger

Answer Details

Southern Guinea Savanna is found in the following states in Nigeria: Kogi and Kwara. Southern Guinea Savanna is a type of vegetation found in Nigeria and other parts of West Africa. It is characterized by grasses and scattered trees, and it is different from the dense forests found in other parts of the country. The Southern Guinea Savanna region in Nigeria covers parts of Kogi and Kwara states.

Read lesson note on Local (Nigerian) Biomes (JAMB)

Local (Nigerian) Biomes

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Question 4 Report

The beak structure of the organism is best adapted for?

pecking grass

killing and picking fish

pecking woods

sucking nectars

Answer Details

The beak structure of an organism is best adapted for the type of food it primarily consumes. For example, if the organism primarily consumes seeds and grass, its beak will likely be flat and wide, allowing it to effectively peck at the ground and pick up small seeds. If the organism primarily eats fish, its beak will likely be sharp and hooked, allowing it to efficiently kill and pick fish from the water. If the organism primarily feeds on nectar, its beak will likely be long and slender, allowing it to reach into flowers and efficiently suck the nectar. So, the type of food the organism consumes will determine the beak structure that is best adapted for its needs.

Read lesson note on Variety Of Organisms (JAMB)

Variety Of Organisms

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Question 5 Report

The internal structure of a leaf that has larger air space is?

palisade mesophyll

epidermis

spongy mesophyll

vascular bundles

Answer Details

The internal structure of a leaf with larger air spaces is the spongy mesophyll. The mesophyll is the main tissue inside the leaf, and it is divided into two main layers: the palisade mesophyll and the spongy mesophyll. The palisade mesophyll is located near the upper surface of the leaf and has tightly packed cells that are responsible for carrying out photosynthesis. The spongy mesophyll is located near the lower surface of the leaf and has loosely packed cells with larger air spaces between them. The larger air spaces in the spongy mesophyll allow for the exchange of gases such as carbon dioxide and oxygen between the leaf and the air. This is important for the process of photosynthesis, where the plant uses energy from sunlight to convert carbon dioxide and water into glucose and oxygen. The oxygen produced during photosynthesis is released into the air through the stomata, which are small pores found on the surface of the leaf.

Read lesson note on Tissues And Supporting Systems: (WAEC)

Tissues And Supporting Systems:

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Question 6 Report

An adaptation for defense in animals is?

croaking of a male toad

basking in lizard

spines in porcupine fish

huddling together of penguins

Answer Details

An adaptation for defense in animals is spines in porcupine fish. Porcupine fish have spines on their bodies that can be raised when they feel threatened. The spines act as a defense mechanism to deter predators from attacking the fish. When the spines are raised, they make the fish look larger and more intimidating, and the spines can also cause injury to the predator if it tries to bite the fish. Croaking of a male toad is a type of communication that is used to attract mates or defend territory, but it is not an adaptation for defense. Basking in lizards is a behavior that helps the lizards regulate their body temperature, but it is not an adaptation for defense. Huddling together of penguins is a behavior that helps the penguins stay warm in cold environments, but it is not an adaptation for defense.

Read lesson note on Behavioural Adaptations In Social Animals (WAEC)

Behavioural Adaptations In Social Animals

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Question 7 Report

When a colour blind woman marries a normal man, what is the probability of their son being colour blind?

25%

100%

50%

0%

Answer Details

Read lesson note on Probability In Genetics (Hybrid Formation) (WAEC)

Read lesson note on Application Of The Principles Of Heredity (WAEC)

Read lesson note on Heredity (JAMB)

Probability In Genetics (Hybrid Formation)

Application Of The Principles Of Heredity

Heredity

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Question 8 Report

The movement of Euglena towards the source of light is a?

tropic movement

tactic movement

nastic movement

kinetic movement

Evolution Among The Monera, Protista, Fungi, Plantar and Animalia

Movement

Nervous Coordination

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Question 9 Report

The correct pathway for blood flow from the heart to the tissues of mammals is?

heart-arteriole-artery-tissues

heart-artery-arteriole-tissues

heart-vein-venule-tissues

heart-venule-vein-tissues

Answer Details

The correct pathway for blood flow from the heart to the tissues of mammals is: heart-artery-arteriole-tissues. Here's a simple explanation: - The heart pumps blood into the arteries. - The arteries carry the blood away from the heart to smaller blood vessels called arterioles. - The arterioles further distribute the blood to the tissues. It's important to note that the blood carries oxygen and nutrients to the tissues, and picks up waste products from the tissues to be transported back to the heart and then to the lungs, kidneys, and other organs for elimination. This is called the circulatory system.

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Question 10 Report

The system of classification in which there are seven hierarchies from kingdom to species was introduced by?

Felix Dujardin

Carolus Linneus

Theodore Schwann

Charles Darwin

Answer Details

The system of classification in which there are seven hierarchies from kingdom to species was introduced by Carolus Linneus. He was a Swedish botanist and zoologist who is known as the "father of modern taxonomy." He developed a system of classification that organized all living things into groups based on their physical characteristics. This system has seven levels, starting with the kingdom and ending with the species. Linneus's system is still widely used today and forms the basis for our modern understanding of the classification of living things. In a simple and comprehensive way, Carolus Linneus introduced the system of classification that organizes living things into seven groups based on their physical characteristics.

Read lesson note on Classification (WAEC)

Classification

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Question 11 Report

Pentadactyl plan of the fore limbs of frog, bird, horse, whale and man is a proof of?

spontaneous generation

evolution

locomotion

creation

Answer Details

The pentadactyl plan of the fore limbs of frog, bird, horse, whale, and man is a proof of evolution. The pentadactyl plan refers to the similar skeletal structure of the forelimbs of these organisms, which consists of five digits, or fingers, arranged in a similar pattern. This similarity in structure suggests that these organisms share a common ancestor and have evolved over time from a common ancestral form. This is consistent with the theory of evolution and not with spontaneous generation, locomotion, or creation.

Read lesson note on Evolution (Theories and Evidence) (WAEC)

Evolution (Theories and Evidence)

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Question 12 Report

Conversion of atmosphere carbon into chemical bond energy occurs during the process of?

transpiration

photosynthesis

digestion

respiration

Answer Details

The conversion of atmospheric carbon into chemical bond energy occurs during the process of photosynthesis.

Read lesson note on Plant Nutrition (WAEC)

Read lesson note on Nutrition (JAMB)

Plant Nutrition

Nutrition

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Question 13 Report

The components of blood in man are?

red blood cells, white blood cells, plasma and water

red blood cells, white blood cells, and plasma

red blood cells, white blood cells, and platelets

red blood cells, white blood cells, plasma and platelets

Answer Details

The correct answer is: red blood cells, white blood cells, plasma and platelets. Blood is a complex fluid that is made up of different components, each with a specific function.

- Red blood cells (also called erythrocytes) are responsible for carrying oxygen from the lungs to the rest of the body. They have a biconcave shape that allows them to carry more oxygen and are flexible so they can move through the smallest blood vessels.

- White blood cells (also called leukocytes) are part of the body's immune system and help fight infections. There are different types of white blood cells, each with a specific function, such as identifying and destroying harmful bacteria and viruses.

- Plasma is the yellowish fluid part of blood that makes up about 55% of total blood volume. It contains water, proteins, hormones, and waste products. Plasma also helps to transport nutrients, hormones, and waste products throughout the body.

- Platelets (also called thrombocytes) are small, disc-shaped cells that play a crucial role in the formation of blood clots. When there is an injury or wound, platelets clump together to form a clot and stop bleeding.

So, red blood cells, white blood cells, plasma and platelets.

Read lesson note on Adaptation For Survival (WAEC)

Read lesson note on Reproduction (JAMB)

Adaptation For Survival

Reproduction

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Question 14 Report

A universal recipient of blood belongs to blood group?

O

AB

B

A

Answer Details

AB positive blood type is known as the “universal recipient” because AB positive patients can receive red blood cells from all blood types.

Read lesson note on Blood Transfusion (WAEC)

Read lesson note on Reproduction (JAMB)

Blood Transfusion

Reproduction

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Question 15 Report

The end product of the digestion of carbohydrate is?

amino acid

glycerol

glucose

sucrose

Answer Details

The end product of the digestion of carbohydrates is glucose. Carbohydrates are a type of nutrient found in many foods, including breads, cereals, fruits, and vegetables. When we eat carbohydrates, they are broken down into smaller sugar molecules through a process called digestion. The simplest sugar molecule produced by this process is glucose, which is then absorbed into the bloodstream and used as a source of energy by the body's cells. So, glucose is the end product of the digestion of carbohydrates.

Read lesson note on Nutrition (JAMB)

Nutrition

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Question 16 Report

An ecological instrument used to measure wind direction is?

Secchi disc

wind vane

anemometer

slope gauge

Answer Details

A wind vane is an ecological instrument used to measure wind direction. It's a simple device that consists of a small weather-vane mounted on a tall pole or a roof. The wind vane is shaped like a arrow, and it's free to rotate on a vertical axis. The direction that the arrow points in is the direction from which the wind is blowing. This information can be useful for a variety of purposes, including monitoring wind patterns for weather forecasting, studying air pollution, and measuring wind speeds in wind energy applications.

Read lesson note on Ecological Factors (WAEC)

Ecological Factors

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Question 17 Report

The organism above is?

chlamydomonas

algae

volvox

euglena

Answer Details

Volvox is a genus of green algae containing around 20 species of freshwater algae. Thousands of cells together form colonies. There are around 500 to 60,000 cells in each colony of volvox. Leeuwenhoek was the first scientist to observe them in 1700. Volvox is widely studied to understand the process of morphogenesis.

Read lesson note on Forms In Which Living Cells Exist (WAEC)

Forms In Which Living Cells Exist

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Question 18 Report

The sum total of all observable features of an organism is?

phenotype

heterozygous

genotype

homozygous

Answer Details

The sum total of all observable features of an organism is called the phenotype. The phenotype includes physical traits, such as height, eye color, and hair texture, as well as behavioral traits, such as a person's ability to run quickly or play a musical instrument. The phenotype is influenced by both genetic and environmental factors. The genetic component of the phenotype is determined by the organism's genotype, which is the complete set of genetic information that it carries, while the environmental component is determined by the conditions in which the organism lives, such as the availability of food and water, the temperature, and the presence of other organisms. Heterozygous and homozygous are terms that describe the relationship between two copies of a gene in an organism's genotype. Heterozygous means that the two copies of the gene are different, while homozygous means that the two copies are the same. These terms are used to describe the genetic makeup of organisms and can be used to predict the likelihood of certain traits being expressed in the phenotype.

Read lesson note on Genetic Terminologies (WAEC)

Genetic Terminologies

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Question 19 Report

The genes crossing over occurs during?

fertilization

mutation

mitosis

meiosis

Answer Details

Genetic crossing over occurs during meiosis, which is a type of cell division that produces cells called gametes that are used for sexual reproduction. During meiosis, homologous chromosomes (chromosomes that carry similar genes) pair up and exchange genetic material, resulting in the shuffling of genetic information and creating genetic diversity. This process of exchanging genetic material between homologous chromosomes is called genetic crossing over. The end result of crossing over is the production of genetically unique offspring that have a combination of traits from both parents.

Read lesson note on Probability In Genetics (Hybrid Formation) (WAEC)

Read lesson note on Heredity (JAMB)

Probability In Genetics (Hybrid Formation)

Heredity

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Question 20 Report

The waste product of insects is?

uric acid

urine

Mucilage

sweat

Answer Details

The waste product of insects is typically excreted in the form of uric acid. Unlike other insects and mammals, insects do not have a separate organ for the elimination of liquid waste, like a bladder. Instead, they excrete nitrogenous waste in the form of uric acid, which is a solid substance. This solid form of waste helps to conserve water, as insects can lose a significant amount of water through evaporation. The uric acid is excreted through specialized structures called Malpighian tubules, which are found in the insect's abdomen. The uric acid is then passed out of the body through the anus.

Read lesson note on Humans And Environment (JAMB)

Read lesson note on Excretory Systems And Mechanisms; Types Of Excretory Systems (WAEC)

Read lesson note on Excretion (JAMB)

Humans And Environment

Excretory Systems And Mechanisms; Types Of Excretory Systems

Excretion

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Question 21 Report

An adaptive feature of camel to the desert is?

ability to increase sweat production

ability to pass high amount of urine

ability to tolerate low degree of dehydration

ability to tolerate high degree of dehydration

Answer Details

Camel's ability to tolerate high degree of dehydration is an adaptive feature to the desert. This means that camels are able to survive for a long period of time without water and can survive in the harsh, dry conditions of the desert. Their bodies have evolved to store large amounts of water and to conserve water efficiently, which allows them to go for long periods without drinking. This is a critical adaptation for survival in the desert, where water is often scarce.

Read lesson note on Structural Adaptation For Survival (WAEC)

Structural Adaptation For Survival

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Question 22 Report

Which of the following is associated with the dark stage of photosynthesis?

Assimilation of Carbon(IV)oxide

Photophosphorylation

Photolysis

Excitation of chlorophyll

Answer Details

The dark stage of photosynthesis is associated with "Assimilation of Carbon(IV)oxide". Photosynthesis can be divided into two stages: light-dependent reactions and light-independent reactions. The light-dependent reactions occur in the thylakoid membranes of the chloroplasts and require light energy to produce ATP and NADPH, which are energy-rich molecules. The light-independent reactions, also known as the dark reactions, occur in the stroma of the chloroplasts and use the energy from the ATP and NADPH produced in the light-dependent reactions to convert carbon dioxide into glucose. This process is called "Assimilation of Carbon(IV)oxide". "Photophosphorylation" refers to the process of producing ATP in the light-dependent reactions, while "Photolysis" refers to the splitting of water molecules into oxygen and hydrogen ions during the light-dependent reactions. "Excitation of chlorophyll" refers to the process of capturing light energy by chlorophyll molecules in the light-dependent reactions.

Read lesson note on Nucleic Acids (WAEC)

Nucleic Acids

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Question 23 Report

The under secretion of thyroxine in children results in?

goitre

gigantism

kwashiorkor

cretinism

Answer Details

The under secretion of thyroxine in children results in cretinism. Thyroxine is a hormone produced by the thyroid gland and is essential for normal growth and development. Inadequate production of this hormone can lead to cretinism, which is a condition characterized by stunted growth, intellectual disability, and physical deformities.

Read lesson note on Hormonal Coordination (WAEC)

Hormonal Coordination

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Question 24 Report

The development of big muscles by a wrestler is an example of?

acquired characteristics

inherited characteristics

mutation

atrophication

Answer Details

The development of big muscles by a wrestler is an example of acquired characteristics. Acquired characteristics refer to changes that an organism acquires during its lifetime as a result of its experiences and environment. For example, a wrestler may develop big muscles through regular exercise and weightlifting. These changes are not passed on to the next generation and are not part of the organism's genetic material.

Read lesson note on Heredity (JAMB)

Heredity

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Question 25 Report

One of the functions of water in seed germination is to?

dilute the embryo

make the soil wet and soft

activate the enzymes

promote aerobic respiration

Answer Details

One of the functions of water in seed germination is to activate the enzymes. When a seed is planted in soil, it needs water to start growing. The water activates certain enzymes in the seed that help it to begin the process of germination. Enzymes are like tiny helpers that carry out specific tasks in the seed. Some enzymes break down stored food in the seed, while others help to soften the seed coat so that the plant can emerge. By activating the enzymes, the water helps to kick-start the process of growth and development in the seed, making it possible for it to sprout and eventually become a mature plant.

Read lesson note on Nitrogen Cycle (WAEC)

Read lesson note on Cellular Respiration (WAEC)

Read lesson note on Factors Affecting The Distribution Of Organisms (JAMB)

Nitrogen Cycle

Cellular Respiration

Factors Affecting The Distribution Of Organisms

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Question 26 Report

The body of a snail is divided into head?

thorax and abdomen

visceral mass and abdomen

thorax and foot

visceral mass and foot

Answer Details

The body of a snail is divided into a head, visceral mass, and foot.

Read lesson note on Respiration (JAMB)

Read lesson note on Classification (WAEC)

Respiration

Classification

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Question 27 Report

Gaseous exchange in annelids is more advanced and efficient compared to flatworms because?

the cells of their epidermis have no blood capillaries

they have well developed respiratory structures

their cylindrical shape gives high surface area to volume ratio

their surface area to volume ratio is very low

Answer Details

In simple organisms, such as cnidarians and flatworms, every cell in the body is close to the external environment. Their cells are kept moist and gases diffuse quickly via direct diffusion. Flatworms are small, literally flat worms, which “breathe” through diffusion across the outer membrane. Annelids have a closed circulatory system; the blood is entirely contained in vessels. Annelids have no lungs, although many species have simple gills.

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Question 28 Report

An example of arboreal animal is?

squirrels

duck

pig

rat

Answer Details

An example of an arboreal animal is a squirrel. Arboreal animals are animals that live in trees and have adaptations that allow them to move and live effectively in this environment. Squirrels are a classic example of arboreal animals as they are well-known for their ability to climb trees and live in the branches. They have strong hind legs, sharp claws, and a tail that helps them balance and maneuver in the trees. Squirrels use trees for food, shelter, and protection, and their arboreal lifestyle is a critical aspect of their survival.

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Question 29 Report

In genetic counseling, a man with hemoglobin formation HbA HbS is most preferred to marry a woman of?

HbA HbA

HbC HbH

HbM HbF

HbS HbS

Answer Details

In genetic counseling, it is preferred for a man with the HbA HbS blood type to marry a woman with the HbA HbA blood type. This is because the HbA HbS blood type, also known as sickle cell anemia, is a genetic condition where the red blood cells can take on a sickle shape, leading to reduced oxygen flow and causing various health problems. If a man with HbA HbS marries a woman with HbA HbA, there is a lower chance that their children will inherit the sickle cell anemia gene. On the other hand, if the man with HbA HbS marries a woman with HbS HbS, there is a higher chance that their children will inherit the sickle cell anemia gene and suffer from the condition. In summary, it is recommended for a man with HbA HbS to marry a woman with HbA HbA to reduce the risk of passing on the sickle cell anemia gene to their children.

Read lesson note on Heredity (JAMB)

Heredity

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Question 30 Report

The type of fruit that is formed from a single flower having several free carpels is?

indehiscent fruit

aggregate fruit

simple fruit

fleshy fruit

Answer Details

An aggregate fruit is the type of fruit that is formed from a single flower having several free carpels.

Read lesson note on Regulation Of Internal Environment (WAEC)

Read lesson note on Internal Structure Of A Flowering Plant (JAMB)

Regulation Of Internal Environment

Internal Structure Of A Flowering Plant

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Question 31 Report

The movement of sugars from the leaf to other parts of plant is?

guttation

transpiration

transportation

translocation

Answer Details

The movement of sugars from the leaf to other parts of the plant is called translocation. Plants make food through photosynthesis, which occurs in the leaves. The sugar produced in the leaves is used by the plant as energy, but it also needs to be transported to other parts of the plant, such as the roots, stems, and flowers. This movement of sugar is called translocation. Translocation occurs through the plant's transport system, which includes tiny tubes called xylem and phloem. The xylem transports water and minerals from the roots to the leaves, while the phloem transports sugars and other organic compounds from the leaves to other parts of the plant. This helps ensure that all parts of the plant have the necessary resources to grow and thrive.

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Question 32 Report

The feeding relationship that exists between a tick and a cow is?

parasitism

mechanism

saprophytism

commensalism

Answer Details

The feeding relationship that exists between a tick and a cow is parasitism.

Read lesson note on Morphology Of Monocotyledonous And Dicotyledonous Plants (WAEC)

Morphology Of Monocotyledonous And Dicotyledonous Plants

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Question 33 Report

The growth of mucor on a piece of bread is?

scavenging

commensalism

autotrophism

saprophytism

Answer Details

The growth of mucor on a piece of bread is saprophytism. Saprophytes are organisms that obtain their nutrients from dead organic matter, such as bread in this case. Mucor is a type of fungus that is known to grow on organic matter in a saprophytic manner.

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Question 34 Report

The display of male agama lizard is to?

scare predators

regulate body temperature

attract female for mate

give invite to intruders

Answer Details

The display of male agama lizards is to attract female lizards for mating. Agama lizards are known for their bright, colorful displays, which they use to show off to potential mates. The display typically involves the male standing up on his hind legs, puffing out his throat, and waving his tail. This display is meant to demonstrate the male's strength and vitality, and to attract the attention of female lizards who are looking for a suitable mate. It is important to note that the display of agama lizards is not meant to scare predators or regulate body temperature, although it may have these side effects. The primary purpose of the display is to attract a mate and increase the chances of successful reproduction.

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Question 35 Report

The structure that joins the two strands of a chromosome together is the?

spindle

cellulose

centromere

chromatid

Answer Details

The structure that joins the two strands of a chromosome together is the centromere.

Read lesson note on Chromosomes: The Basis Of Heredity (WAEC)

Chromosomes: The Basis Of Heredity

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Question 36 Report

petaloid sepals serve the function of?

carrying out photosynthesis

attracting pollinating agents to a flower

retaining pollen grains in the corolla tubes

protecting the inner floral parts of the flower

Answer Details

Petaloid sepals serve the function of attracting pollinators to a flower. In many plants, the sepals look similar to petals and are brightly colored to catch the attention of insects, birds, bats or other animals. These animals are attracted to the flower for the nectar or pollen that it provides, and in the process, they help to pollinate the flower, which is essential for the plant to produce seeds and reproduce. So, the petaloid sepals help the flower to attract pollinators and ensure its survival.

Read lesson note on Transport (JAMB)

Read lesson note on Internal Structure Of A Flowering Plant (JAMB)

Transport

Internal Structure Of A Flowering Plant

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Question 37 Report

sources of air pollutants are?

industrial chimneys, burning fossil oils and river dams

sulphurdioxide, acid rain and pesticides

sulphur dioxide, vehicle exhausts, and aerosols

sewage,smoke and old vehicles

Answer Details

Air pollutants are substances present in the air that can harm human health, wildlife, and the environment. They come from various sources including: 1. Industrial chimneys: Industries such as power plants, manufacturing facilities, and refineries release pollutants like sulfur dioxide, nitrogen oxides, and particulate matter into the air through their chimneys. 2. Vehicle exhausts: Cars, trucks, buses, and other vehicles emit pollutants like carbon monoxide, nitrogen oxides, and particulate matter into the air. 3. Burning fossil fuels: The burning of fossil fuels such as coal, oil, and natural gas releases pollutants like sulfur dioxide, nitrogen oxides, and carbon monoxide into the air. 4. Sewage: Waste from sewage treatment plants and septic systems can emit pollutants like methane and nitrogen into the air. 5. Smoke: Open burning of waste, forest fires, and other sources of smoke can emit pollutants like particulate matter and carbon monoxide into the air. It's important to note that not all sources of air pollutants are man-made. Natural sources such as volcanic eruptions, dust storms, and wildfires also contribute to air pollution.

Read lesson note on Resources To Be Conserved: Soil, Water, Wildlife, Forest And Minerals (WAEC)

Read lesson note on Classification (WAEC)

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

Classification

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Question 38 Report

Lack of nucleus is a feature in?

osteocyte

neurone

erythrocyte

leucocyte

Answer Details

Erythrocyte.

Read lesson note on Cell Structure (WAEC)

Cell Structure

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Question 39 Report

The part of mammalian skin that excretes metabolic wastes is?

sweat gland

horny layer

Malpighian layer

sebaceous gland

Answer Details

The part of mammalian skin that excretes metabolic wastes is the sweat gland. The sweat glands are responsible for producing and secreting sweat, which is a mixture of water, salts, and other substances, including metabolic waste products. The sweat is produced in response to changes in body temperature, such as during physical activity or exposure to warm environments, and it is released onto the surface of the skin through small openings called sweat pores. From there, it evaporates and helps to regulate the body's temperature. The horny layer is the outermost layer of the skin, composed of dead skin cells that have been pushed to the surface. It acts as a protective barrier, helping to keep harmful substances out of the body. The Malpighian layer is the deepest layer of the skin, and it contains blood vessels, nerve endings, and other structures that are important for the skin's function. The sebaceous glands are small glands in the skin that produce an oily substance called sebum, which helps to moisturize the skin and protect it from environmental damage.

Read lesson note on Excretory Systems And Mechanisms; Types Of Excretory Systems (WAEC)

Excretory Systems And Mechanisms; Types Of Excretory Systems

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Question 40 Report

During mitosis, the stage at which chromosomes lines up around the equator is?

telophase

metasphase

anaphase

prophase

Answer Details

During mitosis, the stage at which chromosomes line up around the equator is metaphase. Metaphase is the stage in the cell cycle when the chromosomes condense and become visible. They then line up along the equator, or the center of the cell, in preparation for separation and distribution to the two daughter cells. This is a critical stage in the process of cell division and ensures that each daughter cell receives a complete set of chromosomes.

Read lesson note on Cell Cycle (WAEC)

Cell Cycle

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