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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
Why do moss plants produce very large number of male gametes? Provide one reason. What are these gametes called?
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?
Give the floral adaptations for anemophily.
Describe the structure of its microsporangium.
Fill in the blank:
Male sex cells in plants are called _________.
Define the term Pollinating.
Put a tick mark (✓) against the correct alternative in the following statements
Vegetative propagation is not observed in:
Name the two types of pollination.
Differentiate Between Cross Pollination and Self Pollination:
Give an account of any two biotic agents for pollination along with their adaptations.
Give an account of various abiotic agencies used in pollination along with their adaptations for pollination.
Wind pollination is common in ______.
A dioecious flowering plant prevents both ______.
Chief pollinators of agricultural crops are ______.
Male and female flowers are present on different plants (dioecious) to ensure xenogamy, in ______.
Triple fusion in Capsella bursa pastoris is fusion of male gamete with ______.
The flower which possesses both androecium and gynoecium is called perfect or ______.
Describe any three adaptations in hydrophilous flowers.
Which of the following is classified as biotic agents of pollination?
Which type of pollination involves the transfer of pollen between different plants of the same species?
