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NECO SSCE Biology 2005 past questions and answers

This 2005 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 2005 set with instant marking.

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Sample NECO SSCE Biology 2005 questions

1. In a grassland ecosystem, which organisms initially convert solar energy into chemical energy stored in food?
  1. Green plants
  2. Fungi
  3. Carnivores
  4. Detritivores

Answer: A. Green plants

Green plants are producers that trap light energy during photosynthesis and store it in organic compounds.

2. A human digestive enzyme works fastest at 37°C and pH 7, but its activity falls sharply at 70°C; what best explains the fall?
  1. The enzyme has been converted into a carbohydrate
  2. Heat has changed the shape of its active site
  3. The substrate has become a catalyst
  4. The enzyme has increased the pH of the solution

Answer: B. Heat has changed the shape of its active site

High temperature denatures the enzyme, altering its active site so the substrate no longer fits effectively.

3. A plant cell is placed in distilled water; which movement causes the cell to become turgid?
  1. Solute diffuses out through the cell wall
  2. Water leaves by active transport
  3. Water enters through the selectively permeable membrane by osmosis
  4. Mineral salts enter through the nucleus

Answer: C. Water enters through the selectively permeable membrane by osmosis

Water moves by osmosis from the dilute external solution into the more concentrated cell sap.

4. Which outcome is normally produced by mitosis in a diploid body cell?
  1. Four cells with half the chromosome number
  2. Two cells with different chromosome numbers
  3. Four genetically varied gametes
  4. Two genetically similar cells with the same chromosome number

Answer: D. Two genetically similar cells with the same chromosome number

Mitosis produces two daughter cells that normally retain the parent cell chromosome number and genetic information.

5. Which tissue carries water and dissolved mineral salts from the roots toward the leaves of a flowering plant?
  1. Xylem
  2. Phloem
  3. Epidermis
  4. Cortex

Answer: A. Xylem

Xylem vessels conduct water and mineral salts from the roots to the aerial parts of the plant.

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