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NECO SSCE Biology 2025 past questions and answers

This 2025 NECO SSCE Biology set has 40 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2025 set with instant marking.

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Sample NECO SSCE Biology 2025 questions

1. In a grassland food chain, grass contains 20,000 kJ of energy and grasshoppers obtain 10% of it. If frogs obtain 10% of the grasshopper energy, how much energy reaches the frogs?
  1. 2,000 kJ
  2. 200 kJ
  3. 100 kJ
  4. 20 kJ

Answer: B. 200 kJ

Grasshoppers receive 2,000 kJ and frogs receive 10% of that, which is 200 kJ.

2. A student captures and marks 40 grasshoppers, releases them, and later captures 50 grasshoppers, of which 10 are marked. Using the capture-recapture estimate, what is the estimated population?
  1. 200
  2. 100
  3. 250
  4. 500

Answer: A. 200

The estimate is (40 x 50) / 10 = 200 grasshoppers.

3. Which process in the nitrogen cycle converts atmospheric nitrogen into compounds that plants can eventually absorb?
  1. Denitrification
  2. Transpiration
  3. Nitrification only
  4. Nitrogen fixation

Answer: D. Nitrogen fixation

Nitrogen fixation converts atmospheric nitrogen into ammonia or related usable nitrogen compounds.

4. Fertiliser runoff enters a lake and is followed by excessive algal growth and the death of many fish. Which immediate change most directly causes the fish deaths?
  1. A rapid increase in dissolved oxygen
  2. A fall in dissolved oxygen as decomposers break down dead algae
  3. A decrease in the lake's mineral content
  4. A rapid decline in water temperature

Answer: B. A fall in dissolved oxygen as decomposers break down dead algae

Decomposers use dissolved oxygen while breaking down the abundant dead algae, leaving too little for fish.

5. Which action is an example of ex situ conservation of an endangered Nigerian plant species?
  1. Storing its seeds in a gene bank
  2. Protecting the forest where it grows naturally
  3. Prohibiting farming within its natural habitat
  4. Restoring the species' original woodland

Answer: A. Storing its seeds in a gene bank

A gene bank conserves biological material outside the species' natural habitat, so it is ex situ conservation.

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