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WAEC Biology Questions and Answers for 2023/2024 (Theory and Objectives)

WAEC Biology Questions and Answers 2023. I will be showing you WAEC Biology objective and theory repeated questions for free. You will also understand how WAEC Biology questions are set and many more examination details.

The West African Examination Council (WAEC) is an examination body in Nigeria that conducts the Senior Secondary Certificate Examination and the General Certificate in Education in May/June and November/December respectively.

WAEC Biology Objectives and Essay Answers 2023

Today’s Answers:

The 2023 Biology answers will be posted here today 7th June during the exam.

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-Chlorophyll formation
-Electron transport in photosynthesis
-Enzyme activation
-Nitrogen fixation

Effects of deficiency in plants:
-Chlorosis (yellowing of leaves)
-Stunted growth
-Reduced fruit and seed production
-Interference with nutrient uptake

-Nitrogen fixation
-Enzymatic reactions
-Iron uptake and utilization
-Seed germination and growth
-Chlorophyll formation

Effects of deficiency in plants:
-Reduced nitrogen fixation
-Chlorosis (yellowing of leaves)
-Impaired sulfur metabolism
-Abnormal phosphorus uptake
-Altered enzyme activity

-Osmotic regulation
-Enzyme activation
-Protein synthesis

Effects of deficiency in plants:
-Stunted growth.
-Leaf chlorosis.
-Weak stems.
-Reduced flower and fruit production.
-Increased susceptibility to diseases and pests.

-It plays a vital role in activating various enzymes within plants
-It helps to facilitate photosynthesis
-It helps facilitate respiration in plants

Effects of deficiency in plants:
-Stunted growth
-Yellowing of leaves
-Death of plant tissue
-Reduced fertility
-Increased susceptibility to diseases

-It helps in building proteins
-It is a fundamental constituent of nucleic acids and DNA
-It helps in formation of chlorophyll
-It helps in energy transfer and metabolism
-It is an enzyme co-factor

Effects of deficiency in plants:
-Reduced photosynthesis
-Poor protein synthesis
-Leaf necrosis
-Increased susceptibility to diseases and pests.
-Impaired nutrient transport

(i) Fruits and Vegetables
(ii) Grains and Cereals
(iii) Legumes and Pulses
(iv) Nuts and Seeds
(v) Dairy Products
(vi) Meat, Poultry, and Fish

(i) The buccal cavity is the entry point for food and liquids into the digestive system.
(ii) The buccal cavity is responsible for chewing or masticating food.
(iii) The buccal cavity contains salivary glands that produce saliva.
(iv) The buccal cavity plays a vital role in speech production.

(i) The duodenum receives partially digested food from the stomach and continues the process of digestion.
(ii) The duodenum is involved in the absorption of nutrients from digested food.
(iii) The duodenum plays a role in regulating the overall process of digestion.
(iv) The duodenum secretes several important hormones that regulate various aspects of digestion.

(i) One of the primary roles of the stomach is to store food temporarily after it has been ingested.
(ii) The stomach aids in the mechanical digestion of food through muscular contractions known as peristalsis.
(iii) The stomach secretes gastric juices, primarily composed of (HCl) and enzymes such as pepsin, which play a crucial role in chemical digestion.
(iv) The stomach controls the rate at which food is released into the small intestine.

Glucose and fructose



The questions below are the WAEC Biology Questions. Go through them and be ready to score high in your WAEC 2023 Biology Examination. ExamLabs.

1. The scientist who introduced binomial nomenclature in the classification of organisms was

A. Charles Darwin

B. Carolus Linnaeus  

C. John Ray  

D. Louis Pasteur

2. Which of the following statements is true about arthropods?

A. Prothorax bears only legs 

B. Mesothorax bears only legs 

C. Metathorax bears only wings 

D. Prothorax bears only wings

3. What level of organization is Spirogyra?

A. Organ system

B. Organ

 C. Cell  

D. Tissue

4. The streaming movement of cytoplasm within paramecium is known as

A. Transpiration

 B. Digestion

  C. Cyclosis

D. Osmosis

5. Which of the following organelles is found only in plant cells?

A. Mitochondria

 B. Ribosomes

 C. Lysosomes 

D. Plastids

6. Active transport differs from diffusion in that active transport

A. Is a very fast process

B. Allows the movement of substances against concentration gradient

. C. Takes places in both light and dark reactions of photosynthesis

D. Occurs in both plant and animal tissues.

The diagrams below are illustration of an experimental set-up to demonstrate a type of tropic response in plants. Study them and answer question 7 and 8

waec biology questions and answers

7. The type of response demonstrated is

A. Phototropism  

B. Geotropism 

C. Hydrotropism

 D. Thigmotropism

8. The conclusion drawn from the experiment is that

A. Shoots of plants are negatively thigmotropic. 

B. Shoots of plants are negatively geotropic. 

C. Leaves of plants are positively phototropic.

D. Roots of plants are positively hydrotropic.

9. The odontoid process is found on the

A. Axis vertebra 

B. Atlas vertebra 

C. Thoracic vertebra 

D. Sacral vertebra

10. A seedling was made to stand in a solution of red ink for three hours and a transverse section of the stem was examined under the microscope. The process being investigated was

A. The importance of micro elements of plants. 

B. Ascent of water through the xylem. 

C  Diffusion of coloured substances. 

D. Distribution of food in plants.

11. Which of the following structures would carry out respiration?

A. Germinating cowpea. 

B. Decolorized leaf

C. Dry leaf. 

D. Boiled cowpea

12. Which of the following substances is not an excretory product of animals?

A. Carbon dioxide

B. Urea

 C. Sweat 

D. Oxygen

13. An example of homeostasis in living organisms is

A. Cooling effect resulting from evaporation of water from the body surface.

B. Root hairs of a plant growing toward a source of light 

C. Changing of the body colour of chameleon to match the colour of the foliage on which it is resting.

D. The release of phosphorus into the phloem of a plant growing in a phosphorus-deficient soil

14. Ultrafiltration in the kidney takes place in the

A. Renal vein 

B. Medulla

C. Loop of Henle 

D. Bowman’s capsule

15. The thyroid gland is located at the base of the

A. Midbrain

B. Kidney

C. Neck 

D. Liver

16. Which of the following statements about the response of neurons to stimulus is correct?

A. Neurones respond to stimulus of any strength.

B. Neurones respond to all stimuli applied in rapid succession.

C. Neurones respond more rapidly during the absolute period.

D. Intensity of stimulus must reach a threshold value before the neurons can be excited.

17. Which of the following practices may lead to infection of the eye? Use of

A. Contact lenses

B. Convex lenses

C. Biconcave lenses

D. Concave lenses.

18. The structures for gaseous exchange in breathing roots are    

A. Stomata 

B. Lenticels

 C. Cuticles 

D. Mitochondria

The diagram below is an illustration of the life cycle of an insect. Study it and answer question 19 and 20

waec biology

19. The adult insect in this life cycle is

A. Housefly

B. Butterfly

C. Cockroach 

D. Mosquito

20. The larva is also known as

A. Nymph

 B. Maggot

C. Caterpillar 

D. Chrysalis

21. The source of energy required  by plants during food production is

A. Photosynthesis

 B. Chlorophyll 

C. Sunlight

 D. Microorganisms

22. One major difference between plant and animal nutrition is the ability of plants to synthesize

A. Food for plants and animals

B Water for plants

C. Water for animals

D. Food for plants only.

23. By what process is starch converted into maltose?

A. Hydrolysis

B. Condensation 

C. Translocation 

D. Photosynthesis

24. The ascent of water in tall tree is mainly due to

A. Adhesive forces

B. Transpiration pull 

C. Root pressure 

D. Cohesive force

25. The duodenum of a person was surgically removed. Which of the following substances would have their digestion affected?

A. Starch and protein only

B. Starch and lipids

C. Starch, protein and maltose

D. Starch, protein and lipids.

26. Which of the following dental formulae represents the dentition in rabbits?

A. 12/1 C 0/0 P 3/2 M 2/3  

B. 1 2/2 C 1/1 P 2/2 M 3/3

 C. 1 ½ C 0/0 P 2/3 M 3/3  

D.1 2/1 C 0/1 P 3/2 M 3/3

The diagram below is an illustration of an experimental set-up to

 Demonstrate a property of soil. Study it and answer question 27 and 28

waec biology questions and answers

27. The property of soil demonstrated is

A. Particle size

B. Capillarity

C. Colour  

D. Texture

28. Which of the following statements would be a correct observation at the end of the experiment? Water moves

A. Highest in sandy soil

B. Lowest in loamy soil

C. To the same level in all soil types

D. Highest in clayed soil.

29. The most important factor(s) that influence(s) the ecological niche of an organism is/are the

A. Water, light and predator-prey relationship.

B. Food and water availability.

C. Physical environment.

D. Competition for food and space

30. The diagram below is an illustration of organisms in an air-tight aquarium. The most important factor needed by the organism is

waec biology expo

A. Light energy

 B. Low humidity  

C. Oxygen


31. Which of the following instruments is used to determine the turbidity of water?

A. Hygrometer 

B. Hydrometer 

C. Secchi disc  

D. Rain gauge


32. In an ecosystem, the least efficient energy transfer link is from the

A. Secondary consumers to decompose.

B. Sun to producers

C. Primary consumers to secondary consumers. 

D. Producer to primary consumers.

33. Xerophytes have the following characteristics aimed at conserving water except

A. Thick cuticle B. Broad leaf surfaces.

C. Sunken stomata 

D. Waxy cuticle

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

A. Commensalism

 B. Predation 

C. Parasitism

 D. Mutualism

35. When large numbers of organisms share limited space and resources, the immediate result is

A. Extinction  

B. Emigration  

C. Competition

 D. Immigration

36. Which of the following diseases is caused by a bacterium?

A. Ringworm

 B. Poliomyelitis 

C. Syphilis  

D. Malaria

37. Conservation of  wildlife is necessary mainly because

A. Wild species cannot resist diseases better than their domesticated species. 

  B. Many predator wild animals help in the control of pests

C. It prevents the extinction of species

D. Many people derive pleasure from observing wild animals.

Two conscious patient X and Y whose blood group genotypes are AO and AB respectively were transfused with blood from the same donor. Patient X immediately showed signs of difficulty in breathing while patient Y showed no negative reaction.

Use the information above to answer questions 38 and 39.

 38. Patient X and Y were likely transfused with blood of genotype

A. OO 

B. AO 



39. What should the hospital have done to prevent patient X from showing the symptom described above? Patient X should have

A. Undergone an agglutination test

B. Been asked for the blood group.

C. Been screened for HIV  

 D. Undergone malaria test.

40. The greatest contribution to genetic studies was made by

A. Gregor Mendel

 B. Thomas Morgan 

C. Charles Darwin 

D. Robert Hooke.

41. The exchange of genes between homologous chromosomes is called

A. Crossing over

B. Back cross 

C. Test cross

 D. Mutation

The diagrams below are illustration of the inheritance of coat in mice. J, K, L, M and N are parents. The crosses between two parent mice gave rise to offspring P, Q, R and S. study the diagram and answer question 42 and 43

2020 biology questions and answers

42. Which parent mouse is heterozygous for coat colour,




D. L

43. Which of the offspring are all homozygous?




D. R

44. Genes that remain linked are those

A. Close to each other on the chromosomes.

B. On the same locus on the chromosomes

C. On the homologous chromosomes

D. Which are allelic pair

45. A plant cell has 14 chromosomes prior to mitosis. What is the number of chromosomes in the daughter cells?

A. 14 

B. 56 

C. 28 

D. 7

46. The chemical bonds the bases of the two strands of DNA together is

A. Oxygen  

B. Hydrogen bond 

C. Electrovalent bond 

D. Covalent bond

The diagram below is an illustration of one of the theories of evolution. Study it and answer questions 47 and 48

waec biology answers

47. Who proposed the theory in the illustration?

A. Louis Pasteur

B. Gregor Mendel 

C. Robert Hooke 

D. Jean Lamarck

48. The theory supports

A. Struggle for survival

B. Natural selection

C. Independent assortment.

D. The use and disuse of body parts

49. In evolution, fossils are naturally preserved in

A. Rocks 

B. Water 

C. Chemicals 

D. Trees

50. Which of the following insects is not a social insect?

A. Termite

 B. Housefly 

C. Housefly 

D. Ant

WAEC Biology Essay and Objective 2023 (EXPO)

The above questions are not exactly 2023 WAEC Biology questions and answers but likely WAEC Biology repeated questions and answers.

These questions are for practice. The 2023 WAEC Biology expo will be posted on this page during the WAEC Biology examination. Keep checking and reloading this page for the answers.

Tips on How to Pass WAEC Biology Questions

Have a Target and Work Towards Actualizing it 

You have decided to pass WAEC Biology 2023 and I am sure of that. Now, the next thing you should do is set targets.

You have told yourself, “I will score A in WAEC Biology 2023”, that’s not all. You need to plan on how to make it happen. Create a timetable and master plan to achieve your goals.

 Get the Recommended Textbook on Biology for 2023 WAEC Examination

Normally, WAEC recommends books for the examination. But apart from WAEC Literature in English where certain novels are compulsory, you are free to use any good English Language textbook to prepare for WAEC 2023 exam.

Some textbooks are more difficult to understand. If you have any topic you are finding difficult to understand, then get a textbook that will simplify the topics and make life better for you.

 Do not Skip Biology Examples and Exercises you Will Come Across While Reading: 

Many candidates are fond of skipping exercises and even examples while studying textbooks. In fact, we like notebooks so much that we could ask, “can I read my notebook and pass WAEC Biology 2023?” Don’t be scared of attempting exercises in Biology. Face the challenges.

Note: The above questions are likely WAEC Biology Questions and Answers, not the real questions

If you have any questions about WAEC Biology Questions and Answers, feel free to ask through the comment session and we shall answer you within the shortest possible time.

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Last Updated on August 9, 2023 by Admin

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143 thoughts on “WAEC Biology Questions and Answers for 2023/2024 (Theory and Objectives)”

  1. Pls I will be writimg November and December weac pls I need your help the pass question and answers if possible pls

    • Pls I will be writimg November and December weac pls I need your help the pass question and answers if possible pls

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