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JAMB Biology 1984 Question 11

Question 11

Animal Kingdom

Fig.1 below represents a quill feather. The structure labelled 'M' is the

Diagram for this question
  1. A.quill
  2. B.rachis
  3. C.superior umbilicus
  4. D.inferior umbilicus
  5. E.aftershaft.
Show the answer and explanation

Answer: C (superior umbilicus)

Explanation

M marks the small opening where the quill joins the vane, the superior umbilicus. The inferior umbilicus is the hole at the tip of the quill.