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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
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
Justify the statement that the maize grain is a 'one-seeded fruit'.
Put a tick mark (✓) against the correct alternative in the following statement
In a seed, food is generally stored in
Differentiate between the following pair of terms:
Radicle and plumule.
In the spaces provided below, draw labelled diagrams to show the three stages in the germination of any seed you have observed.
Multiple choice questions. Tick (✓) the correct choice:
A seed consists of
Mention the functions of the following:
Endosperm
Give the functions of the following:
Endosperm
Name the following:
The part of castor seed that stores food.
