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प्रश्न
Explain the different types of endosperms in angiosperms.
Explain the development of the different types of endosperms in angiosperms.
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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.
संबंधित प्रश्न
Sketch and label stages in the development of the angiospermic female gametophyte from the functional megaspore.
List the three stages the annuals and biennial angiosperms have to pass through during their life cycle.
A capsicum flower has 240 ovules in its ovary. But, it produces a fruit with only 180 viable seeds.
Give a reason for the Following:
Pollen grains of wind-pollinated flowers are produced in large quantities.
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.
The flower is the site of ______.
Verticillaster inflorescence is a characteristic feature of ______.
Angiosperms have dominated the land flora primarily because of their ______.
Which of the following statement is incorrect?
