Advertisements
Advertisements
प्रश्न
Explain the events upto double fertilisation after the pollen tube enters one of the synergids in an ovule of an angiosperm.
Advertisements
उत्तर
The events which occur during double fertilization are:
-
Two male gametes are released by the pollen tube into the cytoplasm of synergid.
-
One of these male gametes moves towards the egg cell and fuses with the nucleus. This process is called syngamy and results in the formation of a diploid cell, zygote,which eventually forms an embryo.
-
The other male gamete moves towards the polar nuclei located in the central cell and fuses with them to form a triploid primary endosperm nucleus (PEN). This process is called triple fusion.
-
Since two types of fusion, syngamy and triple fusion, take place here, the phenomenon is called double fertilisation.
APPEARS IN
संबंधित प्रश्न
Name the terminal stage of ageing in the life cycle of plants.
Explain the different types of endosperms in angiosperms.
A typical flower has ______ different kinds of whorl.
Science of cultivation, breeding, marketing and arrangement of flowers is called ______.
The flower is the site of ______.
Angiosperms have dominated the land flora primarily because of their ______.
Place the following groups of plants in order, beginning with those that first appeared on the earth and progressing toward those that appeared most recently in time.
The flower is a highly modified and condensed reproductive shoot specially meant for ______
In angiosperms, the site of sexual reproduction is ______.
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:
