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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.
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संबंधित प्रश्न
Give any two examples each of endospermic (albuminous) seeds, and non-endospermic (exalbuminous) seeds.
Give two difference in the following pairs:
Bean seed and maize grain
Put a tick mark (✓) against the correct alternative in the following statement
If the cotyledons remain under the soil, then such seeds type of germination is called
Given below is a longitudinal section of a bean seed. Label the parts marked 1 to 5 and write their functions.
State one function of the following
radicle
State one function of the following
micropyle
Name the part of the seeds from which the following are given out:
(a) Roots :
(b) Leaves :
In bean seed, germination is _______.
Fill in the blanks:
A mature seed consists of ______ and ____ coat.
Give two examples of the following:
Monocotyledonous albuminous seeds.
