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प्रश्न
Describe the structure of seed by a suitable diagram.
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
Is the following statement true (T) or false (F)?
Some seeds have no cotyledons at all.
Give any two examples each of endospermic (albuminous) seeds, and non-endospermic (exalbuminous) seeds.
Why do we not use the terms maize fruit and maize seed? What do we say instead?
Put a tick mark (✓) against the correct alternative in the following statement
In a germinating seed, the shoot develops from:
Multiple choice questions. Tick (✓) the correct choice:
Conditions necessary for seed germination are
Mention the functions of the following:
Endosperm
Give the functions of the following:
Cotyledons
Name the following:
What is formed from radical and plumule?
Give two examples of the following:
Monocotyledonous endospermic seeds showing hypogeal germination.
Differentiate between:
Albuminous seed and Exalbuminous seed.
