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ICSE Class 9 Answered

Can I have the structure of castor bean seeds explanation with image?
Asked by ankitamukherjee6079.9sdatl | 03 May, 2020, 08:12: PM
Expert Answer
Castor is a dicotyledonous plant hence seeds contain two cotyledons.

Structure of a dicot seed:
  • A dicotyledonous seed is covered by a seed coat.
  • A seed coat is made of two layers—an outer testa and an inner tegmen.
  • There is a scar on the seed coat called hilum. Through the hilum, the developing seeds are attached to the fruit.
  • A micropyle is the small pore present just above the hilum.
  • An embryo is enclosed by the seed coat.
  • The embryo has an embryonal axis and two cotyledons.
  • The cotyledons are fleshy, and they serve as the food reserves for the developing embryo.
  • At the two ends of the embryonal axis are the radicle and the plumule.

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