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JAMB Biology Past Questions 1991

10 questions from the JAMB 1991 Biology paper, with answers and explanations. Tap "Show answer" under each one when you are ready.

JAMB 1991Question 1 · Ecology and Environment
The most important factors which influence an organism's way of life in its habitat are
  1. A.the physicals and biotic enviroment
  2. B.Food and water availability
  3. C.temperature, water, light and predator-prey relationship
  4. D.competition for food and spaces
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Answer: A. the physicals and biotic enviroment

An organism's way of life reflects both the physical environment and its biotic interactions.

JAMB 1991Question 2 · General Past Questions
Sting cells are normally found in
  1. A.Flatworms
  2. B.Hydra
  3. C.Snails
  4. D.Paramecium
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Answer: B. Hydra

Hydra is a cnidarian and bears nematocyst-containing stinging cells on its tentacles.

JAMB 1991Question 3 · General Past Questions
One of the features which adapts Paramecium to its environment is the possession of
  1. A.a regular shape
  2. B.two nuclei
  3. C.cilia
  4. D.a pellicle
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Answer: C. cilia

Cilia propel Paramecium through water and also help sweep food toward the oral groove.

JAMB 1991Question 4 · General Past Questions
The gill raker of fishes take part in?
  1. A.feeding
  2. B.respiration
  3. C.swimming
  4. D.diffusion
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Answer: A. feeding

Gill rakers strain and retain food particles while the gill filaments perform gaseous exchange.

JAMB 1991Question 5 · General Past Questions
The element common to protein carbohydrate and lipid is
  1. A.hydrogen
  2. B.sulphur
  3. C.nitrogen
  4. D.phosphorus
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Answer: A. hydrogen

Proteins, carbohydrates and lipids all contain hydrogen; nitrogen and sulphur are not universal constituents of carbohydrates and lipids.

JAMB 1991Question 6 · General Past Questions
Which of the following is a plant excretory product?
  1. A.Oil
  2. B.Cytokinin
  3. C.Resin
  4. D.Amino acids
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Answer: C. Resin

Resin is a plant metabolic waste that is deposited or secreted, often into ducts; cytokinin is a hormone and amino acids are useful metabolites.

JAMB 1991Question 7 · General Past Questions
The function of the epididymis in mammals is the
  1. A.expulsion of urine
  2. B.storage of sperms
  3. C.circulation of blood
  4. D.activation of sperms
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Answer: B. storage of sperms

Sperm mature and are stored in the epididymis before ejaculation.

JAMB 1991Question 8 · General Past Questions
The greatest contribution to genetic studies was made by
  1. A.Thomas Morgan
  2. B.Gregor Mendel
  3. C.Charles Darwin
  4. D.Robert Hooke
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Answer: B. Gregor Mendel

Mendel's controlled pea crosses established the basic laws of inheritance and founded classical genetics.

JAMB 1991Question 9 · General Past Questions
A food web is more stable than a food chain because
  1. A.it contains more organisms
  2. B.it has greater energy source
  3. C.it is not easy to destroy
  4. D.every organism has an alternative source
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Answer: D. every organism has an alternative source

A food web provides alternative feeding routes, so loss of one food organism need not break the entire energy pathway.

JAMB 1991Question 10 · Mammalian Physiology and Anatomy
Deoxygenation blood flows into the right and left lungs through the
  1. A.pulmonary vein
  2. B.vena cava
  3. C.pulmonary artery
  4. D.subclavian vein
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Answer: C. pulmonary artery

The pulmonary arteries carry deoxygenated blood from the right ventricle to the lungs for oxygenation.

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