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JAMB UTME Biology 2009 past questions and answers

This 2009 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 2009 set with instant marking.

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Sample JAMB UTME Biology 2009 questions

1. When a person's body temperature rises above normal, which response helps restore it?
  1. Skin arterioles constrict and sweating decreases
  2. Skin arterioles dilate and sweating decreases
  3. Skin arterioles dilate and sweating increases
  4. Skin arterioles constrict and sweating increases

Answer: C. Skin arterioles dilate and sweating increases

Vasodilation increases heat loss from the skin, while evaporation of more sweat cools the body.

2. Which sequence correctly traces an impulse through a simple reflex arc?
  1. Receptor, sensory neurone, relay neurone, motor neurone, effector
  2. Effector, motor neurone, relay neurone, sensory neurone, receptor
  3. Receptor, motor neurone, sensory neurone, relay neurone, effector
  4. Sensory neurone, receptor, motor neurone, effector, relay neurone

Answer: A. Receptor, sensory neurone, relay neurone, motor neurone, effector

A reflex impulse travels from the receptor through sensory and relay neurones to a motor neurone and then an effector.

3. After a carbohydrate-rich meal, insulin helps lower blood glucose mainly by promoting
  1. the conversion of glycogen to glucose in the liver
  2. the breakdown of proteins into amino acids
  3. the release of glucagon from the pancreas
  4. the uptake of glucose by cells and its storage as glycogen

Answer: D. the uptake of glucose by cells and its storage as glycogen

Insulin promotes cellular glucose uptake and glycogen formation, reducing the concentration of glucose in the blood.

4. In which part of a mammalian nephron is most of the filtered glucose normally reabsorbed into the blood?
  1. Bowman's capsule
  2. Proximal convoluted tubule
  3. Loop of Henle
  4. Collecting duct

Answer: B. Proximal convoluted tubule

The proximal convoluted tubule selectively reabsorbs virtually all filtered glucose under normal conditions.

5. When the eye accommodates to focus on a nearby object, which change occurs?
  1. The ciliary muscles relax and the lens becomes thinner
  2. The suspensory ligaments tighten and the lens becomes more convex
  3. The ciliary muscles contract, the suspensory ligaments slacken, and the lens becomes more convex
  4. The pupil widens and the retina moves farther from the lens

Answer: C. The ciliary muscles contract, the suspensory ligaments slacken, and the lens becomes more convex

For near vision, ciliary muscle contraction slackens the suspensory ligaments so the elastic lens becomes more convex.

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