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प्रश्न
State significance of pollination.
What is the significance of pollination?
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उत्तर
Significance of pollination:
- Pollination is a significant event because it precedes fertilization.
- It brings the two types of gametes closer for the process of fertilization.
- Also, cross-pollination introduces variations in the plants due to the mixing of different genes which increases adaptability towards the environment or surroundings.
- Fertilization thereby results in the formation of fruits and seeds. Without pollination, there wouldn't be any fruit and seed formation.
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संबंधित प्रश्न
Explain what you understand by sexual reproduction.
Draw a diagram of the longitudinal section of a flower exhibiting germination of pollen on stigma and label (i) ovary, (ii) male germ-cell, (iii) female germ-cell and (iv) ovule on it.
Draw a diagram of a pistil showing pollen tube growth into the ovule and label the following:
Pollen grain, male gamete, female gamete, ovary.
Distinguish between unisexual and bisexual flowers giving one example of each. Draw a diagram showing process of germination of pollen grains on stigma and label the following parts:
(a) Female germ cell
(b) Male germ cell
(c) Ovary
Identify the odd. Stigma, Style, Pollen, Ovary.
Draw a diagram of the longitudinal section of a flower and label the following parts.
Explain the sexual reproduction process in plants with a diagram.
Match the following
| 1. | Petal | Opuntia |
| 2. | Fern | Chrysanthemum |
| 3. | Phylloclade | Attracts insect |
| 4. | Hooks | Spore |
| 5. | Sucker | Bignonia |
Sperm and egg nuclei fuse due to ______.
State the number of sets of chromosomes present in a zygote.
