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WAEC Biology 2010 Question 19

Question 19

Reproduction in Animals

Which of the following statements about the development of the foetus is not correct?

  1. A.The circulatory system of the foetus is directly connected to the maternal blood vessels.
  2. B.The foetus depends on the mother's blood for its food and oxygen.
  3. C.The foetus is surrounded by a water sac.
  4. D.Food and oxygen are carried across the placenta to the embryo's blood.
Show the answer and explanation

Answer: A (The circulatory system of the foetus is directly connected to the maternal blood vessels.)

Explanation

The mother's and foetus's blood never mix; materials pass across the thin placental membrane.