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प्रश्न
Explain the different types of endosperms in angiosperms.
Explain the development of the different types of endosperms in angiosperms.
Describe types of endosperm.
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उत्तर
- Free-nuclear endosperm: This is the most common type. The primary endosperm nucleus divides repeatedly without cell wall formation, and the resulting nuclei remain free in the cytoplasm. Later, walls may form around the nuclei.
Example: Coconut water. - Cellular endosperm: Each nuclear division is immediately followed by cell wall formation, so the endosperm becomes cellular from the very beginning.
Examples: Peperomia, Villarsia, Drimys. - Helobial endosperm: This type is intermediate between the free-nuclear and cellular types. The first division of the primary endosperm nucleus is followed by a cell wall formation that separates the endosperm into a large micropylar chamber and a small chalazal chamber.
Examples: Vallisneria, Erimus.
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संबंधित प्रश्न
Read the statement and answer the questions that follow.
A flower of brinjal has 520 ovules in its ovary. However, it produces a fruit with only 480 viable seeds.
(a) What could have prevented the rest of the 40 ovules from maturing into viable seeds? Explain giving a reason.
(b) Describe the development of a dicot embryo in a viable seed.
(c) Why certain angiospermic seed albuminous while others are exalbuminous? Explain.
Define Racemose inflorescence
Name the terminal stage of ageing in the life cycle of plants.
Explain the events upto double fertilisation after the pollen tube enters one of the synergids in an ovule of an angiosperm.
A typical flower has ______ different kinds of whorl.
In a fertilized ovule, n, 2n, and 3n conditions occur respectively in ______
Verticillaster inflorescence is a characteristic feature of ______.
Angiosperms have dominated the land flora primarily because of their ______.
What is the similarity between gymnosperms and angiosperms?
The flower is a highly modified and condensed reproductive shoot specially meant for ______
Match List I with List II:
| List I (Types of Stamens) |
List II (Example) |
||
| A. | Monoadelphous | I. | Citrus |
| B. | Diadelphous | II. | Pea |
| C. | Polyadelphous | III. | Lily |
| D. | Epiphyllous | IV. | China-rose |
Choose the correct answer from the options given below:
Axile placentation is observed in ______.
What is the floral envelope called when the calyx (sepals) and corolla (petals) cannot be differentiated from one another?
The swollen terminal part of the pedicel where all the floral whorls are arranged is known as __________.
Which of the following is considered an "essential whorl" of a flower?
The male reproductive unit of a flower, the androecium, is made up of individual members called ______.
