Biology 2021

Objective Questions

Which of the following organelles is common to both plant and animal cells?

A) Cellulose cell wall B) Chlorophyll C) Cell membrane D) Large vacuole

Correct Answer: C) Cell membrane

The diagrams below are illustrations of different sections of a particular fruit. Study them and answer the question below.

The section X and Y respectively are _________.

A) longitudinal and transverse B) transverse and longitudinal C) cross and transverse D) transverse and cross

Correct Answer: B) transverse and longitudinal

The fruit that has the illustrated sections is a _________.

A) hesperidium B) capsule C) drupe D) cypsela

Correct Answer: A) hesperidium

The diagram below is an illustration of a fungus. Study it and answer the question below

The structure labeled I is associated with _________.

A) sexual reproduction B) asexual reproduction C) bud formation D) gamete formation

Correct Answer: B) asexual reproduction

The structure labeled (II) is the _________.

A) spore B) stolon C) columella D) sporangium

Correct Answer: C) columella

Which of the following statements about the structure labeled III is correct? It __________.

A) secretes digestive enzymes into the substrate B) absorbs mineral salts from the soil C) forms the root hairs of the organism D) develops into stolon

Correct Answer: A) secretes digestive enzymes into the substrate

The diagram below is an illustration of a living organism. Study it and answer the question.

The level of organization of the organism is ____________.

A) tissue B) cell C) organ D) system

Correct Answer: B) cell

The organism belongs to the Phylum _________.

A) Rhizopoda B) Ciliophora C) Euglenophyta D) Rhodophyta

Correct Answer: C) Euglenophyta

A plant cell placed in a solution with a higher water potential will ___________.

A) expand and then shrink B) enlarge and become turgid C) expand and then burst D) decrease in size and become flaccid

Correct Answer: B) enlarge and become turgid

Offspring formed by sexual reproduction exhibit more variation than those formed by asexual reproduction because _________.

A) greater amount of DNA is involved in sexual reproduction B) gametes of parents have different genetic composition C) genetic materials come from parents of two different species D) sexual reproduction is a lengthy process

Correct Answer: B) gametes of parents have different genetic composition

Radius and ulna are bones of the _________.

A) pectoral girdle B) upper arm C) pelvic girdle D) lower arm

Correct Answer: D) lower arm

The blood vessel which carries blood from the alimentary canal to the liver is the ___________.

A) hepatic artery B) hepatic vein C) hepatic portal vein D) mesenteric artery

Correct Answer: C) hepatic portal vein

The diagram below is an illustration of the longitudinal section of a mammalian organ. Study it and answer the question below

Which of the labeled parts is the cortex?

A) I B) II C) III D) IV

Correct Answer: D) IV

What is the main function of the organ?

A) Excretion B) Respiration C) Reproduction D) Locomotion

Correct Answer: A) Excretion

Detoxification of urea takes place in the ________.

A) pancreas B) heart C) liver D) testes

Correct Answer: C) liver

Which of the following hormones is suddenly secreted into the bloodstream of a frightened person?

A) Insulin B) Adrenaline C) Thyroxine D) Parathormone

Correct Answer: B) Adrenaline

The temperature control centre in mammals is located in the ________.

A) skin B) hypothalamus C) pituitary gland D) adrenal gland

Correct Answer: B) hypothalamus

The diagram above is an illustration of a type of eye defect in humans. Study it and answer questions 18 and 19.

The eye defect illustrated in the diagram is __________.

A) hypermetropia B) astigmatism C) presbyopia D) myopia

Correct Answer: D) myopia

The eye defect can be corrected by the use of _________.

A) convex lens B) concave lens C) bifocal lens D) cylindrical lens

Correct Answer: B) concave lens

How many gametes are produced in the pollen grain of a flowering plant before fertilization?

A) One B) Two C) Three D) Four

Correct Answer: B) Two

Which of the following organisms does not undergo incomplete metamorphosis?

A) Locust B) Grasshopper C) Butterfly D) Cockroach

Correct Answer: C) Butterfly

An enzyme reaction may begin to decline when _________.

A) the optimum temperature is attained B) the pH of the medium is altered C) grant D) subscription

Correct Answer: A) the optimum temperature is attained

The diagram below is an illustration of the growth of a plant in a water culture. After a few days, the solution turned green and the plant died. Use it to answer the question below.

What precaution should have been taken to prevent the solution from turning green?

A) Use a non-green plant B) Aerate the solution daily C) Cover the culture vessel with opaque paper D) Keep cotton wool around the seedling to make it dry

Correct Answer: C) Cover the culture vessel with opaque paper

The death of the plant was likely caused by _________.

A) excess supply of nutrients to the plant B) inadequate supply of water to the plant C) algal growth in the solution that used up the nutrient D) inability of the plant to make food due to lack of sunlight

Correct Answer: C) algal growth in the solution that used up the nutrient

Which of the following factors is not necessary for photosynthesis?

A) Water B) Carbon (IV) oxide C) Wind D) Sunlight

Correct Answer: C) Wind

Autotrophic nutrition is a process whereby an organism obtains food ___________.

A) by utilizing its stored energy B) by synthesizing simple substances using energy C) from other organisms in exchange for some products D) in a synthesized form, from other living organisms

Correct Answer: B) by synthesizing simple substances using energy

The process that takes place at the light stage of photosynthesis is ___________.

A) splitting of water molecules to form hydrogen ions B) reduction of carbon(IV) oxide to form carbohydrate C) formation of two molecules of photoglyceric acid D) breaking down of ATP molecules to produce energy

Correct Answer: A) splitting of water molecules to form hydrogen ions

The diagram below is an illustration of the foot of an animal.

The adaptation of this type of foot is that it is ______________.

A) used as a bait to catch fish in water B) used as a paddle for swimming C) effective in scratching the soil for food D) used for killing prey in water

Correct Answer: B) used as a paddle for swimming

The following organisms are examples of carnivorous plants except ___________.

A) Gloriosa B) Venus flytrap C) Pitcher plant D) Utricularia

Correct Answer: A) Gloriosa

Plants and animals of an ecosystem make up a _________.

A) habitat B) succession C) community D) population

Correct Answer: C) community

Rabbits cannot survive in an aquatic habitat because they have ___________.

A) no scales B) no gills C) fore limbs D) lateral line

Correct Answer: B) no gills

The illustration below is a food chain.

Grass → Grasshopper → Domestic Fowl → Hawk

What would happen if the population of domestic fowl decreases? The population of __________.

A) grasshoppers would decrease B) hawks would increase C) grasshoppers would increase D) grasses available to grasshoppers would increase

Correct Answer: C) grasshoppers would increase

Which of the following features is a characteristic of aquatic plants? Possession of __________.

A) multiple epidermis B) heavily lignified tissue C) finely divided leaves D) succulent stem

Correct Answer: C) finely divided leaves

An association between living organisms in which one organism lives on and feeds at the expense of the other organism is known as _________.

A) mutualism B) commensalism C) parasitism D) predation

Correct Answer: C) parasitism

When a large number of organisms share limited resources, the result is ____________.

A) mutualism B) extinction C) commensalism D) competition

Correct Answer: D) competition

Which of the following behaviors is correctly matched with the corresponding diseases?

A) Smoking cigarettes B) Having multiple sexual partners C) Living near dirty gutters D) Eating uncooked meat

Correct Answer: D) Eating uncooked meat

Endangered species are organisms that are __________.

A) likely to migrate to other favourable lands B) likely to disappear from the surface of the earth C) reproducing profusely in an area D) dangerous to humans and attacking other animals

Correct Answer: B) likely to disappear from the surface of the earth

Which of the following practices is a wildlife conservation method?

A) Use of cover crops B) Crop rotation C) Mulching D) Discourage poaching

Correct Answer: D) Discourage poaching

Which of the following resources cannot be conserved?

A) Forest B) Water C) Soil D) Garbage

Correct Answer: D) Garbage

The diagrams below are illustrations of types of comb found in domestic fowl. Study them and answer the question below. The types of comb show ________.

A) variation B) inheritance C) cell theory D) courtship behaviour

Correct Answer: A) variation

Which factor is most likely responsible for the various types of comb?

A) Environment B) Genetics C) Physiology D) Morphology

Correct Answer: A) Environment

Which of the following statements about mitosis is not correct?

A) Chiasmata are not formed B) Bivalents are not formed C) It does not lead to variation D) Four daughter cells are produced

Correct Answer: D) Four daughter cells are produced

A mixture of blood with antigen A and blood containing antibody a will ____________.

A) lead to agglutination B) facilitate dissolution of clot C) have no effect on blood composition D) change the blood group

Correct Answer: A) lead to agglutination

Plants suitable for experiments in genetics must not _______.

A) produce numerous seeds within a short time B) have a small number of chromosomes C) have a relatively short life cycle D) produce one generation in a long period

Correct Answer: D) produce one generation in a long period

Which of the following statements about sickle cell anaemia is correct?

A) It is caused by sex-linked genes B) It is more common in males than in females C) Two sickle cell carrier parents may have a sickling child D) It is caused by a recessive gene

Correct Answer: D) It is caused by a recessive gene

In humans pointed eyebrows (B) is a dominant trait over smooth eyebrows (b). A student and the mother have smooth eyebrows while the father has pointed eyebrows. What is the genotype of the father?

A) BB B) Bb C) bb D) BBbb

Correct Answer: B) Bb

A woman with Rhesus negative blood group was advised not to marry a man with Rhesus positive blood group because __________.

A) it will hinder her from having blood transfusion from her husband B) it will result in sickness and probably death of the offspring C) her children may all resemble her husband D) it may affect her childbearing ability

Correct Answer: B) it will result in sickness and probably death of the offspring

Which of the following organisms exhibits division of labour?

A) Butterfly B) Cockroach C) Termite D) Housefly

Correct Answer: C) Termite

Natural selection arises as a result of _________.

A) gene mutation B) change of habitat C) reduction in population D) climate change

Correct Answer: D) climate change

Which of the following statements is not Lamarck’s postulate on evolution?

A) Great changes in the environment result in corresponding changes in species B) Frequently used organs become well developed while the ones not used become vestigial C) Well developed acquired characters are inheritable D) Survivors in a competitive community must have inherited useful traits

Correct Answer: D) Survivors in a competitive community must have inherited useful traits

Theory Questions

A sample of human blood was put in a test tube and allowed to spin in a centrifuge. The components of the blood sample were clearly separated.

List the four main components of blood that would be in the test tube.
Name the components of the blood that:
1. Would form the top layer in the test tube
2. Destroys pathogens
3. Is bi-concave in shape
4. Would be relatively low in a haemophilic condition
5. Is produced in the bone marrow
6. Is a thrombocyte
7. Is nucleated
Mention three chemical substances transported by the blood component named in 1(b)(i)
List four diseases associated with blood.
Explain briefly why a disease of the blood could be dangerous.

What is dentition in animals?
Describe briefly the generalized structure of a tooth in animals.
List three food substances that plants manufacture from glucose.
Make a diagram, 6cm to 8cm long of an experimental set-up to show that oxygen is produced during photosynthesis.

Complete the table below by placing each of the following organisms under the appropriate heading.
Algae, Bacteria, Dog, Water lettuce, Tadpole, Cat, Lemna, Waterleaf, Mucor, Mushroom

(i) Name four products of decomposition
(ii) Mention three roles of decomposers on a refuse dump.
List three materials found in a refuse dump which would not be affected by the action of decomposers.

Complete the table below by naming five wildlife animals in West Africa and one body part each that makes them endangered because of the activities of humans.

State three effects each of the following factors on the conservation of natural resources:

Poor economy of a nation
Poaching

State four roles played by the Government in conservation of natural resources.

Complete the table below by naming the nutrient cycle that involves each of the given processes and give three other processes involved in the nutrient cycle.

What is irritability?
Complete the table below by stating the type of response elicited by each of the given actions.

Name three animals each that exhibit:

Territoriality
Seasonal migration
Display

Practical Questions

Study specimen A, B and C and answer questiions 1(a) to 1(c)

Name the part of the body where specimens A, B, and C would be found in a mammal.
- A: _________
- B: _________
- C: _________
State one function each of specimens A, B, and C.
- A: _________
- B: _________
- C: _________
Make a drawing, 6cm to 8cm long, of the anterior view of specimen C and label fully.
State one function each of four of the parts labelled in 1(b)(i).
Mention the total number of each of specimens A, B, and C in adult humans.
- A: _________
- B: _________
- C: _________
Name two other vertebrae in humans.

Beakers D, E, F and G contain seeds that have been sown for seven days. Carefully remove one seed/seedling from each of the beakers labelled D, E, F and place each on the corresponding white tile labelled D, E, F and G. Study them and answer questions 2(a) to 2(c).

Observe the soils and seed/seedling, then record the observation and result on the table below.
(i) Name one condition for germination that was likely absent in the beakers labelled E, F, and G:
- E: _________
- F: _________
- G: _________
(ii) Give two reasons for the result in beaker D.
Make a drawing 8cm to 10cm long of one seed/seedling obtained from the beaker labelled D and label fully.

Study specimens L and M and answer questions 4(a) to 4(e).

Classify each of specimens L and M into its:
- (i) Phylum
  - L: ________
  - M: ________
- (ii) Class
  - L: ________
  - M: ________
(i) State three observable features of members of the class of specimen L.

(ii) Name three other classes of the phylum to which specimen L belongs.
(i) State two ways each by which specimens L and M are of economic importance.
- L: ________
- M: ________
(ii) State five ways by which specimen L can be controlled.
(i) State five observable differences between specimens L and M.

(ii) State four observable similarities between specimens L and M.
Name one habitat each of specimens L and M.
- L: ________
- M: ________