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Classification of Seeds - Structure of a Dicotyledonous Seed

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Estimated time: 2 minutes
CBSE: Class 12

Key Points: Structure of a Dicotyledonous Seed

  • Seed coat: Consists of two layers—testa (outer) and tegmen (inner).
  • Hilum: A scar on the seed coat showing the point of attachment to the fruit.
  • Micropyle: A small pore present above the hilum helps in water absorption.
  • Cotyledons: Two fleshy cotyledons present, storing reserve food material.
  • Embryo: Contains an embryonal axis with radicle and plumule at opposite ends.
  • Endosperm: May be present (e.g., castor) or absent (e.g., bean, gram, pea) in mature seeds.

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