1) explain the structure of castor
seed with diagram
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It is a knob-like outgrowth. Plumule lies in between the two cotyledons and is quite indistinct. ... Castor-oil seed is dicotyledonous (having two cotyledons), endospermic (with a special food storing tissue called endosperm) and perispermic (having perisperm or persistent nucellus).
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Besides the basic structures (endosperm, embryo and seed-coat) certain special structures may arise during seed development. In castor bean a fleshy whitish tissue, the caruncle, develops at one end of the seed. It is derived from the integument. ... The cotton fibres are the elongated epidermal cells of the seed-coat.
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