Q. The part of castor seed that yields oil is

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Solution:

The seeds of Ricinus communis, Cocos nucifera, Zea mays and other cereals are albuminous or endospermic (seeds with endosperm), where endosperm acts as the food storage tissue of a seed.
So, the part of castor (Ricinus communis) seed that yields oil (food material) is endosperm.