Free WAEC 2025 Biology Answers Expo/Runs 2025:
WAEC BIOLOGY INSTRUCTIONS
ANSWER THREE QUESTIONS IN ALL, TWO QUESTIONS FROM SECTION A, AND THE COMPULSORY QUESTION IN SECTION B.
SECTION A
(PICK ANY TWO)
QUESTION 1
QUESTION 2
QUESTION 3
QUESTION 4
SECTION B
QUESTION 5(Compulsory)✅
BIOLOGY OBJECTIVE (Type A to D)
BIOLOGY ESSAY ANSWERS:
NUMBER 1
(1a)
Excretion is the biological process by which living organisms remove metabolic waste products and toxic substances produced from their body to maintain internal balance and prevent harm.
(1bi)
(i) Urea
(ii) Carbon dioxide
(1bii)
(i) Oxygen
(ii) Water
(1c)
[TABULATE]
=Organism=
(i) Paramecium
(ii) Planaria
(iii) Leaf of plant
(iv) Earthworm
=Excretory structure=
(i) Contractile vacuole
(ii) Flame cells
(iii) Stomata
(iv) Nephridia
=Mechanism involved in excretion=
(i) Osmoregulation
(ii) Diffusion and filtration
(iii) Transpiration
(iv) Filtration and diffusion
=Adaptation of the structure for excretion=
(i) Thin semi-permeable membrane
(ii) Highly branched tubules for efficient removal
(iii) Guard cells regulate opening and closing of stomata
(iv) Extensive network increases surface area for excretion
(1d)
(i) Removes metabolic waste products from the blood.
(ii) Regulates water and salt balance.
(iii) Maintains acid-base balance and regulates blood pH.
NUMBER 5
(5a)
(i) Increased rate of evaporation leading to water loss and dehydration in organisms.
(ii) Denaturation of enzymes affecting metabolic processes.
(iii) Reduced reproductive success due to stress or death of gametes.
(iv) Migration or death of heat-sensitive species.
(v) Altered behavior such as seeking shade or burrowing to escape heat.
(5b)
(i) Destruction of vegetation and loss of plant cover.
(ii) Death of animals and destruction of habitats.
(iii) Soil erosion due to loss of protective plant cover.
(iv) Reduction in soil fertility as nutrients are lost through burning.
(v) Air pollution from smoke and release of greenhouse gases.
(5c)
(i) Coordination of international response to disease outbreaks.
(ii) Provision of guidelines and information on disease prevention and control.
(iii) Distribution of vaccines and medical supplies to affected areas.
(iv) Monitoring and surveillance of disease spread globally.
(5di)
Countershading in Tilapia is a camouflage adaptation where the back is dark and the belly is light. It helps the fish blend with its surroundings, protecting it from predators.
(5dii)
Seasonal migration in birds is the regular movement of birds from one region to another in response to changes in seasons. Birds often migrate to warmer areas to find food, breed, or escape harsh weather.
(5ei)
(i) Bacteria
(ii) Viruses
(iii) Fungi
(iv) Protozoa
(v) Algae
(5eii)
(i) Bacteria
(ii) Viruses
(5fi)
(i) Blood group A
(ii) Blood group B
(5fii)
(i) Agglutination (clumping) of red blood cells, which can block blood vessels and cause organ damage.
(ii) Hemolytic reaction, where the immune system destroys the transfused blood cells, leading to fever, chills, kidney failure, or even death
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Below are the verified WAEC 2025 Biology question papers that were released to the FASTANSWER TEAM since last week.
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