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JAMB UTME Biology 2008 past questions and answers

This 2008 JAMB UTME 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 2008 set with instant marking.

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Sample JAMB UTME Biology 2008 questions

1. After a carbohydrate-rich meal, which response helps return an elevated blood glucose concentration toward normal?
  1. Pancreatic beta cells release insulin, promoting glucose uptake and storage
  2. The thyroid gland releases thyroxine to convert glucose into amino acids
  3. The adrenal cortex releases glucagon to increase glycogen breakdown
  4. The pancreas stops releasing hormones until the glucose is used up

Answer: A. Pancreatic beta cells release insulin, promoting glucose uptake and storage

Insulin promotes glucose uptake by cells and conversion of excess glucose to glycogen, lowering blood glucose.

2. In a simple withdrawal reflex, which sequence correctly traces an impulse from the stimulus to the response?
  1. Effector, motor neuron, relay neuron, sensory neuron, receptor
  2. Receptor, motor neuron, sensory neuron, relay neuron, effector
  3. Receptor, sensory neuron, relay neuron, motor neuron, effector
  4. Sensory neuron, receptor, motor neuron, relay neuron, effector

Answer: C. Receptor, sensory neuron, relay neuron, motor neuron, effector

A reflex impulse travels from a receptor through a sensory neuron and relay neuron to a motor neuron and its effector.

3. A shoot bends toward a window because auxin becomes more concentrated on the side away from the light; what is the immediate effect there?
  1. Cells on the illuminated side divide more rapidly
  2. Cells on both sides stop elongating
  3. The shoot tip loses its ability to respond to gravity
  4. Cells on the shaded side elongate more, causing the shoot to bend toward the light

Answer: D. Cells on the shaded side elongate more, causing the shoot to bend toward the light

In a shoot, greater auxin concentration on the shaded side stimulates greater cell elongation there.

4. Which event is specifically defined as pollination in a flowering plant?
  1. Fusion of a male nucleus with an egg nucleus
  2. Transfer of pollen grains from an anther to a stigma
  3. Development of an ovule into a seed after fertilisation
  4. Growth of a pollen tube through the style

Answer: B. Transfer of pollen grains from an anther to a stigma

Pollination is the transfer of pollen from an anther to a stigma, and it occurs before fertilisation.

5. What is an important function of the amniotic fluid surrounding a developing human embryo?
  1. It cushions the embryo against mechanical shocks
  2. It supplies all oxygen directly from the mother's lungs
  3. It produces the embryo's red blood cells throughout pregnancy
  4. It prevents exchange of nutrients between mother and embryo

Answer: A. It cushions the embryo against mechanical shocks

The amniotic fluid surrounds and cushions the embryo, reducing the effects of mechanical shocks.

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