WAEC 2026 Biology OBJ & Essay Questions and Answers – May/June
Preparing for WAEC 2026 Biology OBJ & Essay Questions and Answers – May/June requires a solid understanding of key biological concepts, practical knowledge, and consistent practice. This guide provides likely objective and essay questions with well-structured answers to help candidates revise effectively and boost their chances of success in the upcoming examination.
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WAEC 2026 Biology OBJ & Essay Questions and Answers – May/June Biology Objective Questions (OBJ)
1. The basic unit of life is
A. Tissue
B. Organ
C. Cell
D. System
Answer: C
2. Photosynthesis occurs in the
A. Mitochondria
B. Nucleus
C. Chloroplast
D. Ribosome
Answer: C
3. Which of the following is a vertebrate?
A. Earthworm
B. Snail
C. Fish
D. Insect
Answer: C
4. The process by which plants lose water is called
A. Translocation
B. Transpiration
C. Respiration
D. Diffusion
Answer: B
5. Which organ is responsible for pumping blood?
A. Brain
B. Liver
C. Heart
D. Kidney
Answer: C
6. The green pigment in plants is
A. Hemoglobin
B. Chlorophyll
C. Melanin
D. Cytoplasm
Answer: B
7. Which of these is NOT a nutrient?
A. Protein
B. Vitamin
C. Water
D. Oxygen
Answer: D
8. The function of the root is to
A. Photosynthesize
B. Absorb water
C. Produce seeds
D. Support leaves
Answer: B
9. Which system controls body activities?
A. Digestive
B. Circulatory
C. Nervous
D. Respiratory
Answer: C
10. The site of respiration in cells is
A. Nucleus
B. Ribosome
C. Mitochondria
D. Vacuole
Answer: C
11. Blood is a type of
A. Tissue
B. Organ
C. Cell
D. System
Answer: A
12. Which organism is unicellular?
A. Amoeba
B. Frog
C. Goat
D. Man
Answer: A
13. The breaking down of food is called
A. Digestion
B. Respiration
C. Excretion
D. Growth
Answer: A
14. Which gas is released during photosynthesis?
A. Carbon dioxide
B. Oxygen
C. Nitrogen
D. Hydrogen
Answer: B
15. The human skeleton is made up of
A. 100 bones
B. 206 bones
C. 150 bones
D. 300 bones
Answer: B
16. The movement of substances across a semi-permeable membrane is
A. Osmosis
B. Digestion
C. Circulation
D. Respiration
Answer: A
17. Which of these is a producer?
A. Goat
B. Lion
C. Grass
D. Human
Answer: C
18. The largest organ in the human body is
A. Liver
B. Brain
C. Skin
D. Heart
Answer: C
19. Which vitamin is produced by sunlight?
A. Vitamin A
B. Vitamin B
C. Vitamin C
D. Vitamin D
Answer: D
20. The process of removing waste is
A. Nutrition
B. Excretion
C. Growth
D. Movement
Answer: B
WAEC 2026 Biology OBJ & Essay Questions and Answers – May/June Essay Questions and Answers
1. Define Biology and list its branches.
Answer:
Biology is the study of living organisms.
Branches include Botany (plants), Zoology (animals), Microbiology (microorganisms), and Ecology (environment).
2. Explain photosynthesis.
Answer:
Photosynthesis is the process by which green plants use sunlight, carbon dioxide, and water to produce food (glucose) and oxygen using chlorophyll.
3. Describe the human digestive system.
Answer:
The digestive system includes the mouth, esophagus, stomach, small intestine, and large intestine. It breaks down food into simpler substances for absorption.
4. What is a cell and its types?
Answer:
A cell is the smallest unit of life. Types include plant cells and animal cells.
5. Explain the process of respiration.
Answer:
Respiration is the breakdown of food substances to release energy. It occurs in the mitochondria.
6. List the functions of the skeleton.
Answer:
Support
Protection
Movement
Blood cell production
7. What is an ecosystem?
Answer:
An ecosystem is a community of living organisms interacting with their environment.
8. Describe the circulatory system.
Answer:
It consists of the heart, blood, and blood vessels. It transports oxygen, nutrients, and waste materials.
9. What are nutrients? List examples.
Answer:
Nutrients are substances needed for growth and energy. Examples: carbohydrates, proteins, fats, vitamins, and minerals.
10. Explain reproduction in organisms.
Answer:
Reproduction is the process by which living organisms produce new individuals. It can be sexual or asexual.
11. Differentiate between plant and animal cells.
Answer:
Plant cells have cell walls and chloroplasts, while animal cells do not.
12. Define excretion.
Answer:
Excretion is the removal of metabolic waste from the body.
13. Explain adaptation.
Answer:
Adaptation is the ability of organisms to adjust to their environment for survival.
14. What is food chain?
Answer:
A food chain shows the flow of energy from producers to consumers.
15. Describe the structure of a leaf.
Answer:
A leaf consists of epidermis, mesophyll, veins, and stomata for photosynthesis and gas exchange.
16. Explain the importance of water to living organisms.
Answer:
Water aids digestion, transport, temperature regulation, and metabolic reactions.
17. What are microorganisms?
Answer:
They are tiny organisms visible only under a microscope, e.g., bacteria and fungi.
18. Describe the nervous system.
Answer:
It consists of the brain, spinal cord, and nerves, controlling body activities.
19. Explain the concept of habitat.
Answer:
A habitat is the natural environment where an organism lives.
20. What is growth in living organisms?
Answer:
Growth is an increase in size and complexity of an organism.
