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JAMB Biology Past Questions 2010

10 questions from the JAMB 2010 Biology paper, with answers and explanations. Tap "Show answer" under each one when you are ready.

JAMB 2010Question 1 · Agricultural Science and Basic Biology
The loss of soil through erosion can be reduced by?
  1. A.watering
  2. B.crop rotation
  3. C.manuring
  4. D.irrigation
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Answer: B. crop rotation

Crop rotation (including cover crops) helps maintain soil structure and reduces soil erosion.

JAMB 2010Question 2 · Cell Biology and Biochemistry
Yeast respires anaerobically to convert simple sugar to carbon (IV) oxide and?
  1. A.alcohol
  2. B.acid
  3. C.oxygen
  4. D.water
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Answer: A. alcohol

In anaerobic respiration (fermentation), yeast converts sugar into ethanol (alcohol) and carbon(IV) oxide.

JAMB 2010Question 3 · Ecology and Environment
Which of the following organisms is mainly found in the marine habitat?
  1. A.Achatina
  2. B.Tilapia
  3. C.Dog fish
  4. D.Tortoise
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Answer: C. Dog fish

The dog fish (a type of shark) is mainly found in marine habitats.

JAMB 2010Question 4 · Ecology and Environment
The average number of individuals of a species per unit area of the habitat is the?
  1. A.population density
  2. B.population frequency
  3. C.population size
  4. D.population distribution
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Answer: A. population density

Population density is the average number of individuals of a species per unit area of habitat.

JAMB 2010Question 5 · Genetics and Evolution
A pair of genes that control a trait is referred to as?
  1. A.an allele
  2. B.recessive
  3. C.dominant
  4. D.a hybrid
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Answer: A. an allele

A pair of genes controlling a particular trait is called an allele.

JAMB 2010Question 6 · Genetics and Evolution
If both parents are heterozygous for a trait, the probability that an offspring will be recessive for that trait is?
  1. A.
  2. B.
  3. C.
  4. D.1
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Answer: C.

Crossing two heterozygotes (Aa x Aa) gives a 1:2:1 ratio (AA:Aa:aa), so the probability of a recessive (aa) offspring is 1/4.

JAMB 2010Question 7 · Mammalian Physiology and Anatomy
The oily substance that lubricates the mammalian hair to keep it flexible and water repellent is secreted by the?
  1. A.sweat glands
  2. B.sebaceous glands
  3. C.fatty cells
  4. D.granular layer
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Answer: B. sebaceous glands

Sebaceous glands secrete sebum, an oily substance that lubricates and waterproofs mammalian hair and skin.

JAMB 2010Question 8 · Mammalian Physiology and Anatomy
The two halves of the pelvic girdle are joined together at the?
  1. A.pubic symphysis
  2. B.ilium
  3. C.pubis
  4. D.obturator foramen
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Answer: A. pubic symphysis

The two halves of the pelvic girdle are joined at the pubic symphysis.

JAMB 2010Question 9 · Microbiology and Disease
The protozoan plasmodium falciparum is transmitted by?
  1. A.female Anopheles mosquitoes
  2. B.female Aedes mosquitoes
  3. C.female Culex mosquitoes
  4. D.Female blackfly
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Answer: A. female Anopheles mosquitoes

Plasmodium falciparum (the malaria parasite) is transmitted by the female Anopheles mosquito.

JAMB 2010Question 10 · Plant Biology
Which of the following stimuli is likely to elicit a nastic response in an organism?
  1. A.Wound lesion
  2. B.Light intensity
  3. C.Chemical substances
  4. D.Gravity
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Answer: B. Light intensity

Nastic responses are non-directional movements triggered by stimuli such as changes in light intensity, temperature, or humidity.

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