Question

explain the structure of a dicotyledonous seed

Answer 1

The outermost covering of a seed is the seed coat. The seed coat has two layers, the outer testa and the inner tegmen. The hilum is a scar on the seed coat through which the developing seeds were attached to the fruit. Above the hilum is a small pore called the micropyle. Within the seed coat is the embryo, consisting of an embryonal axis and two cotyledons. The cotyledons are often fleshy and full of reserve food materials. At the two ends of the embryonal axis are present the radicle and the plumule (Figure 18). In some seeds such as castor the endosperm formed as a result of double fertilisation, is a food storing tissue. In plants such as bean, gram and pea, the endosperm is not present in mature seeds and such seeds are called nonendospermous.

Answer 2

The structure of dicotyledonous seed is as follows:

Explanation:

• The embryo consists of embryo axis and 2 cotyledons.
• The cotyledons in dicot seed are swollen due to storage of food reserves in them. The reserves helps in germination of seeds and development of seeds.
• The shoot tip is called as plumule which will give rise to shoot on seed germination.
• The root tip is called as radical which will give rise to root on seed germination.
• The whole seed content is covered with a seed coat.
• The seed coat is protected by the outer layer called as testa and inner layer called as tegmen.
• The seed remain attach to the fruit with hilum.

Learn more about dicotyledonous seed:

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