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Biology

Which of the following cannot pass readily through the placenta to the foetus ?

  1. Antibodies
  2. Amino acids
  3. Alcohol
  4. Haemoglobin

Reproductive System

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Answer

Haemoglobin

Reason — There is exchange of substances between the capillaries of foetus and mother but their blood never mixes. Therefore, there is no exchange of Haemoglobin.

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