Yolk sac is derived from
Correct Answer: Hypoblasts
Description: Ans. is 'a' i.e., HypoblastsThe yolk sac develops from hypoblast cells. By the end of 2nd week the lower half of primary yalk sac pinches off to form definitive yolk sac, while a second wave of hypoblast cells form inner lining of definitive yolk sac.
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