Describe the structure of a dicot seed
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In dicotyledons, the embryo consists of an embryo axis and two cotyledons. Cotyledons are generally swollen part which acts as a food reserve for the developing seedling. The embryo axis has two ends. The one which forms the shoot tip is called plumule and the portion at the lower end which forms the root tip is called radicle. The whole content is enclosed within a protective cover, seed coat. The seed coat is made up of an outer layer called testa and an inner layer called tegmen. And a seed is attached to the fruit through a structure called hilum.
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The structure of a dicot type of seed is described below :
1. There is a covering on the outer portion of dicot seed which is called as coat of seed.
2. Testa (outer) and tegmen (inner) are seen in the layer of seed coat.
3. Embryo is located within the coat of seed. This embryo consists two parts : axis of embryo and cotyledons that are two in number.
4. Examples of such seeds of dicot type are : gram, bean and pea.
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