In the egg of bird, shell and shell membranes are

Permeable to

O_{2}

and

C O_{2}

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Permeable to water only

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Permeable to air only

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Non-permeable

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Solution

The correct option is B Permeable to $O_{2}$ and $C O_{2}$
Reptiles and birds and some insects have developed eggs with a shell impermeable to water. These shells allow oxygen to diffuse into the egg and carbon dioxide to diffuse out. Such eggs which does not allow the transport except for gas exchange are called as cleidoic eggs.
Thus, the correct answer is option (A).

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