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JAMB Biology 2016 past questions and answers

3 questions. Try each one, then open the answer to check yourself and read the explanation.

Question 15

Population Ecology

Use the graph of population size of a given species against temperature to answer: The zone of physiological stress is represented by

Diagram for this question
  1. A.I and II
  2. B.II only
  3. C.II and III
  4. D.I and III.
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Answer: D (I and III.)

Explanation

Zones I and III are the temperature extremes where only a few individuals survive, so the organisms there are under physiological stress. Zone II is the optimum range.

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Question 16

Population Ecology

Use the graph of population size of a given species against temperature to answer: The optimum temperature for the growth of the organism is

Diagram for this question
  1. A.25°C
  2. B.50°C
  3. C.75°C
  4. D.100°C.
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Answer: B (50°C)

Explanation

The population is largest at the peak of the curve, which is at about 50 °C, so that is the optimum temperature.

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Question 30

Soil

Erosion can be reduced along a slope by

  1. A.ridging across slope
  2. B.ridging up slope
  3. C.ridging down slope
  4. D.crop rotation.
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Answer: A (ridging across slope)

Explanation

Ridges made across the slope (contour ridging) stop rain water from running straight down and carrying soil away.

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