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NECO SSCE Biology 2021 past questions and answers

This 2021 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 2021 set with instant marking.

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Sample NECO SSCE Biology 2021 questions

1. Which heart structure prevents blood from flowing back from the aorta into the left ventricle?
  1. The aortic semilunar valve
  2. The tricuspid valve
  3. The bicuspid valve
  4. The pulmonary semilunar valve

Answer: A. The aortic semilunar valve

The aortic semilunar valve closes after ventricular contraction to prevent backflow into the left ventricle.

2. Which tissue carries water and dissolved mineral salts from the roots towards the leaves?
  1. Phloem
  2. Xylem
  3. Epidermis
  4. Cortex

Answer: B. Xylem

Xylem vessels conduct water and mineral salts upward from the roots.

3. A strong upward pull of water through a plant on a hot, dry day is mainly caused by
  1. root pressure alone
  2. movement of sugars in the phloem
  3. rapid evaporation of water from the leaves
  4. diffusion of oxygen into the roots

Answer: C. rapid evaporation of water from the leaves

Rapid evaporation from leaf surfaces increases transpiration pull through the xylem.

4. In humans, the blood passes through the heart twice during one complete circulation of the body; this is known as
  1. open circulation
  2. single circulation
  3. portal circulation
  4. double circulation

Answer: D. double circulation

In double circulation, blood passes through the heart once on the pulmonary route and once on the systemic route.

5. During inhalation in a healthy human, the diaphragm
  1. contracts and becomes flatter
  2. relaxes and becomes flatter
  3. contracts and forms a dome
  4. remains relaxed while the ribs move down

Answer: A. contracts and becomes flatter

Contraction flattens the diaphragm and increases the volume of the thoracic cavity.

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