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BIOLOGY QUESTIONS

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(d) Countershading is an adaptive feature in Tilapia where the coloration of their upper body is darker than their lower body. This helps them blend in with the water when viewed from above, making it difficult for predators to spot them. However, when viewed from below, their lighter lower body matches the lighter water surface, providing camouflage. This adaptation enhances their survival by reducing the likelihood of predation in their natural freshwater habitats.

*WAEC BIOLOGY ANSWERS* *NUMBER ONE* (1a) Excretion is the biological process by which living organisms remove metabolic waste products from their body to maintain internal balance and prevent harm. (1b) -Mammals- (PICK ANY TWO) (i) Urea (ii) Carbon dioxide (iii) Water (iv) Uric acid (v) Creatinine (vi) Excess salts -Plants- (PICK ANY TWO) (i) Oxygen (ii) Water vapor (iii) Tannins (iv) Alkaloids (v) Resins (vi) Latex (1c) Check the image below (1d) (PICK ANY THREE) (i) Removal of nitrogenous wastes like urea (ii) Regulation of water and salt balance (osmoregulation) (iii) Regulation of blood pH (iv) Secretion of erythropoietin to stimulate red blood cell production (v) Regulation of blood pressure through renin (vi) Activation of vitamin D for calcium absorption*WAEC BIOLOGY ANSWERS* *NUMBER TWO* (2a) In a Tabular form -Photosynthetic Nutrition- (PICK ANY TWO) (i) It uses sunlight as the source of energy. (ii) It occurs in green plants, algae, and some protists. (iii) It requires chlorophyll to absorb sunlight. (iv) Oxygen is released as a by-product during the process. -Chemosynthetic Nutrition- (PICK ANY TWO) (i) It uses energy derived from chemical reactions (e.g., oxidation of inorganic substances like ammonia or hydrogen sulfide). (ii) It occurs in some bacteria, especially those found in extreme environments like hydrothermal vents. (iii) It does not require chlorophyll. (iv) It does not release oxygen as a by-product. (2bi) Organisms that feed on dead or decaying organic matter by secreting enzymes and absorbing the digested nutrients. (2bii) (PICK ANY TWO) (i) Rhizopus (ii) Mucor (iii) Penicillium (iv) Aspergillus (v) Yeast (vi) Bacillus subtilis (2biii) Saprophytes feed by secreting extracellular digestive enzymes onto dead organic material. These enzymes break down complex organic substances into simpler soluble compounds, which the saprophytes then absorb for nourishment. (2biv) (PICK ANY THREE) (i) They help in decomposing waste and recycling nutrients. (ii) They are used in the production of antibiotics (e.g., Penicillium). (iii) They play a role in the food and beverage industry (e.g., yeast in bread and alcohol production). (iv) They are used in scientific research and biotechnology. (v) Some help improve soil fertility. (vi) They aid in compost formation and organic farming. (vii) They can be used in the bioremediation of pollutants. (2di) -Butterfly- Feeds on nectar (fluid feeder). (2dii) -Mosquito larva- Filter feeder, they feed on microorganisms in water (2diii) -Mucor- Saprophytic, they feed on decaying organic matter. (2div) -Housefly- Fluid feeder, they feed on liquefied food using proboscis.*WAEC BIOLOGY THEORY ANSWERS* *NUMBER FIVE* (5a) (PICK ANY FIVE) (I) It Increases water loss and dehydration in plants and animals. (ii) It Reduces dissolved oxygen levels in water bodies, there by affecting aquatic life. (iii) It increases the risk of heat-related illnesses and mortality in animals. (iv) organisms tend to move to cooler areas. (v) It reduces the growth and development in some organisms. (vi) It affects the reproductive cycles of orgamism (b) (i) It reduces soil fertility (ii) It leads to soil erosion (iii) It causes air pollution which leads to greenhouse effect (iv) It leads to death of organisms. (v) It polutes the water reduce it's quality. (C) (PICK ANY FOUR) (I) They help in providing guidance and recommendations for disease prevention and control. (ii)They help in providing technical and medical support to affected countries. (iii) They help in monitoring and reporting on the global spread of diseases and emerging health threats. (iv) They help in disseminating accurate information and guidelines to the public and governments. (v) They help to coordinate international efforts for research, data sharing, and resource allocation.

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*🚨PUBLIC ANNOUNCEMENT🚨* *JAMB PORTAL NOW ACTIVE FOR 2025 MOP-UP EXAM SLIP REPRINTING:* JAMB has activated the portal for candidates eligible for the 2025 Mop-Up UTME examination. This applies to candidates who missed their main exam. You can now reprint your examination slip using the link below: https://slipsprinting.jamb.gov.ng/PrintExaminationSlip

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