Q.

Allarltois of Embryo helps in -

A. digestion
B. excretion
C. respiration
D. protection
Answer» B. excretion
Explanation: The allantois is the sac-like extra- embryonic membrane that removes waste from the embryo. As the embryo grows, so does the allantois, eventually pressing against the chorion. This allows the allantois to exchange oxygen and carbon dioxide with the air out-side the eggshell. In addition, the allantois also serves as a disposal site for uric acid.
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