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प्रश्न
Differentiate between geitonogamy and xenogamy (allogamy).
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उत्तर
| Xenogamy (allogamy) | Geitonogamy | |
| 1. | Xenogamy is the transfer of pollen grains from the anther to the stigma of a different plant. | Geitonogamy is the transfer of pollen from one flower’s anther to another flower’s stigma. |
| 2. | This is the only type of pollination which during pollination brings genetically different types of pollen grains to the stigma. It is also known as allogamy. | Genetically, it is similar to autogamy, since the pollen grains come from the same plant. But it requires pollinating agents that help transfer the pollen from another flower onto the same plant. |
| 3. | It is cross-pollination. | It is self-pollination. |
संबंधित प्रश्न
A flower of tomato plant following the process of sexual reproduction produces 240 viable seeds.
Answer the following questions giving reasons :
(a) What is the minimum number of pollen grains that must have been involved in the pollination of its pistil?
(b) What would have been the minimum number of ovules present in the ovary?
(c) How many megaspore mother cells were involved?
(d) What is the minimum number of microspore mother cells involved in the above case?
(e) How many male gametes were involved in this case?
Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination.
Mention two strategies that evolved to prevent self-pollination in flowers.
What is self-incompatibility?
Why does self-pollination not lead to seed formation in self-incompatible species?
Enlist advantages and disadvantages of cross pollination
What is meant by pollination?
Differentiate between the following:
Self pollination and cross pollination.
Can a unisexual flower be self pollinated?
Give one word/term for the following:
Pollination of flowers by birds.
Type of interaction where an individual sacrifices its own welfare (life) for the benefit of another animal of its own species is ______.
What is a flower? Draw a typical flower and label its different parts.
Describe the Advantages and Disadvantages of self-pollination to the Plant.
What are the adaptations which are required in cross-pollinated
Autogamy can occur in a chasmogamous flower if ______.
A particular species of plant produces light, non-sticky pollen in large numbers and its stigmas are long and feathery. These modifications facilitate pollination by ______.
Both chasmogamous and cleistogamous flowers are present in ______.
Anemophily type of pollination is found in ______.
Mention any one example of the hydrophilous flower.
What is hypohydrophily?
