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WAEC Biology 2012 Question 25

Question 25

Ecological Associations

Squirrels easily kill some trees because

  1. A.they inject poisonous substances into the trees.
  2. B.most trees are susceptible to squirrel bites.
  3. C.they feed voraciously on the roots.
  4. D.they gnaw the bark and destroy the phloem.
Show the answer and explanation

Answer: D (they gnaw the bark and destroy the phloem.)

Explanation

Removing a ring of bark destroys the phloem, so food cannot reach the roots and the tree dies.