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प्रश्न
‘Pollination in Gymnosperms is different from Angiosperms’ – Give reasons.
उत्तर
In gymnosperms, the ovules are exposed and the pollens are deposited directly on it. Hence the pollution is direct in a gymnosperm. Whereas in angiosperms it is said to be indirect, as the pollens are deposited on stigma or the pistil.
संबंधित प्रश्न
Match the items in Column A with those in Column B.
|
Column A |
Column B |
|
(a) Generative nucleus |
(i) Pollen tube |
|
(b) Germ pore |
(ii) Endosperm nucleus |
|
(c) Exine |
(iii) Testa |
|
(d) Secondary nucleus |
(iv) Fertilization |
|
(e) Integument |
(v) Male nuclei |
|
(f) Egg nucleus |
(vi) Rough |
Give one word/term for the following:
When pollen grains of a flower reach the stigma of the same flower.
What happens to the following after fertilization?
Calyx
What happens to the following after fertilization?
Stamens
What is ‘double fertilization’? Describe it with the help of a neat and well-labeled diagram. Give its importance.
What is ‘double fertilization’? Describe it with the help of a neat and well-labeled diagram. Give its importance.
Name the scientists who have contributed to the following:
Discovered double fertilization.
Explain the pollination process in Salvia
Match the following
| I) | External fertilization | i) | pollen grain |
| II) | Androecium | ii) | anther wall |
|
III) |
Male gametophyte | iii) | algae |
| IV) | Primary parietal layer | iv) | stamens |
Identify the incorrect pair
In Haplopappus gracilis, number of chromosomes in cells of nucellus is 4. What will be the chromosome number in Primary endosperm cell?
Transmitting tissue is found in
Name the cell which divides to form male nuclei.
Give a concise account of the steps involved in the fertilization of an angiosperm plant.
Explain the development of a Dicot embryo
Which of the following happens during triple fusion?
The success of seed plants on land is mainly due to ______.
Double fertilization is fusion of ______.
Ovules fall off after fertilization.
After fertilization, the seed coat of seeds develops from ______
