Advertisements
Advertisements
प्रश्न
Differentiate between geitonogamy and xenogamy (allogamy).
Advertisements
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
With the help of a suitable example, explain protandry.
Explain the post-pollination events leading to seed production in angiosperms.
Give the floral adaptations for anemophily.
Describe the structure of its microsporangium.
Name two characteristics of flowers in which pollination occur by wind.
What is meant by pollination?
Find the odd-one out, giving reason:
Ovary, style, pollen grain, stigma
State four features of flowers pollinated by insects.
Coelacanth was caught in South Africa. State the significance of the discovery of Coelacanth in the evolutionary history of vertebrates.
Differentiate Between Cross Pollination and Self Pollination:
At which stage pollen grains are shed from the anther in Angiosperms?
Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by ______.
A dioecious flowering plant prevents both ______.
Anemophily type of pollination is found in ______.
Triple fusion in Capsella bursa pastoris is fusion of male gamete with ______.
Which of these is a condition that makes flowers invariably autogamous?
The flower which possesses both androecium and gynoecium is called perfect or ______.
In the dioecious aquatic plant shown, identify the characteristics of the male flowers that reach the female flowers for pollination:
| Size of the flower | Colour of flower | The characteristic feature of pollen grain | |
| A | small | brightly coloured | Lightweight and non-sticky |
| B | large | colourless | large and sticky |
| C | small | white | small, covered with mucilage |
| D | large | colourless | non-sticky |
Autogamy can occur in a chasmogamous flower if ______.
Give any four floral adaptations for chiropterophily.
