Explanation
The avian epidermis is usually thin in areas covered by feathers. Feathers are the derivatives of stratum corneum (the flattened, horny outermost layer made up of stratified and keratinized epidermis).
The corneous layer is much thinner, soft and loosely attached in birds than in reptiles, for muscles to achieve maximum freedom of movement for flight. Feather also protect and insulate the body and are seasonally shed and replaced.
Solution:
Correct answer is option A.Explanation for correct option:
Thallophytes are autotrophic, plant body is thallus-like and devoid of vascular tissues. Both algae and bryophytes have motile sperms and need water for fertilization. But bryophytes can be separated from algae (Thallophyta) because archegonium originated for the first time in bryophytes in the plant kingdom wherein the reproductive organs are covered by a jacket of sterile cells. In algae, sex organs are non-jacketed and unicellular. Hence the correct option is B.
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