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प्रश्न
Describe the structure of seed by a suitable diagram.
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उत्तर
A typical seed consists of the following parts:
(i) Seed coat - It is the outer covering of the seed and develops from the integument of the ovule. Its outer layer is called testa and the inner layer is called tegmen. A seed coat protects the inner parts of the seed.
(ii) Micropyle - It is a small pore present near the hilum which allows entry of water into the embryo.
(iii) Embryo - It is the miniature plant present inside the seed coat. It develops from the fertilized egg. The embryo of a mature seed consists of cotyledons (or seed leaves), plumule, Hypocotyl, and radicle. Dicots have two cotyledons joined by a stalk whereas monocots have one cotyledon joined to the embryo. Cotyledons store food material for the embryo.
(iv) Endosperm - It is a food reserve present in certain seeds. Such seeds are called endospermic seeds.
APPEARS IN
संबंधित प्रश्न
Fill in the blanks:
_______ is a protective layer of radicle and ________ protects the rolled plumule.
Give two difference in the following pairs:
Bean seed and maize grain
Justify the statement that the maize grain is a 'one-seeded fruit'.
Radicle emerges out of the seed earlier than plumule. What one advantage is served by this?
In the spaces provided below, draw labelled diagrams to show the three stages in the germination of any seed you have observed.
Mention the functions of the following:
Seed coat
Give the functions of the following:
Seed coat
Name the following:
In which part of the maize-seed food is stored?
Give two examples of the following:
Dicotyledonous albuminous seeds.
Differentiate between:
Albuminous seed and Exalbuminous seed.
