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NECO SSCE Biology 2017 past questions and answers

This 2017 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 2017 set with instant marking.

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Sample NECO SSCE Biology 2017 questions

1. A plant cell is placed in a concentrated sucrose solution. What happens to it as water moves across its selectively permeable membrane?
  1. It becomes turgid as water enters
  2. It loses water and becomes plasmolysed
  3. It divides by mitosis
  4. It gains solute by active transport only

Answer: B. It loses water and becomes plasmolysed

The concentrated solution has a lower water potential, so water leaves the cell by osmosis and the protoplast pulls away from the cell wall.

2. Which nitrogenous base pairs with adenine in a DNA molecule?
  1. Uracil
  2. Cytosine
  3. Guanine
  4. Thymine

Answer: D. Thymine

In DNA, adenine pairs with thymine, whereas uracil is used in RNA.

3. An object measuring 0.08 mm in length produces an image 24 mm long. What is the magnification?
  1. 300 times
  2. 30 times
  3. 192 times
  4. 0.0033 times

Answer: A. 300 times

Magnification is image size divided by actual size, so 24 mm / 0.08 mm = 300 times.

4. Which factor is directly required as a raw material for photosynthesis?
  1. Oxygen
  2. Glucose
  3. Carbon dioxide
  4. Chlorophyll

Answer: C. Carbon dioxide

Carbon dioxide and water are the raw materials from which plants make carbohydrate during photosynthesis.

5. Which procedure is used to test a leaf for starch after it has been boiled in water?
  1. Heat it in ethanol to remove chlorophyll, rinse it, then add iodine solution
  2. Add Benedict's solution and warm it in a water bath
  3. Add Biuret reagent and look for a violet colour
  4. Add dilute hydrochloric acid and look for effervescence

Answer: A. Heat it in ethanol to remove chlorophyll, rinse it, then add iodine solution

Ethanol removes the chlorophyll and iodine turns blue-black where starch is present.

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