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JAMB Biology 2020 past questions and answers

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

Question 2

Viruses, Monera, Protista and Fungi

Which one of the following options is not true for Mucor or Rhizopus? It

  1. A.grows on moist dead organic matter
  2. B.is a plant
  3. C.has cellulose cell wall
  4. D.reproduces asexually by producing spores.
Show the answer and explanation

Answer: C (has cellulose cell wall)

Explanation

Mucor and Rhizopus are fungi whose cell walls are made of chitin, not cellulose.

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Question 4

Cell and Its Environment

What would happen if solution Y is more concentrated than solution X in the figure below?

Diagram for this question
  1. A.The level of X would rise, Y would fall
  2. B.The level of X would rise, Y would rise
  3. C.The levels of X and Y would stay the same
  4. D.The level of Y would rise, X would fall
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Answer: D (The level of Y would rise, X would fall)

Explanation

Water passes by osmosis from the weaker solution X into the stronger solution Y, so Y rises and X falls.

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Question 36

Evolution

Adaptive radiation is illustrated in

  1. A.modified insect mouthparts.
  2. B.dentition in mammals.
  3. C.wings in birds and bats.
  4. D.appendages in insects.
Show the answer and explanation

Answer: B (dentition in mammals.)

Explanation

Mammals evolved different kinds of teeth from a common pattern to suit different diets, an example of adaptive radiation.

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