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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
Lever mechanism of pollination is observed in
- Salvia
- Jasmine
- Bougainvillea
- Butea
Geitonogamous flowering plants are genetically autogamous but functionally cross-pollinated. Justify.
List the different types of pollination depending upon the source of pollen gain.
Why angiosperm anthers are called dithecous?
Fill in the blank:
Male sex cells in plants are called _________.
Find the odd-one out, giving reason:
Ovary, style, pollen grain, stigma
Can a unisexual flower be self pollinated?
Describe the advantages and disadvantages of cross-pollination to the plant.
What is a flower? Draw a typical flower and label its different parts.
At which stage pollen grains are shed from the anther in Angiosperms?
Mention various adaptations for wind pollination.
Autogamy can occur in a chasmogamous flower if ______.
A dioecious flowering plant prevents both ______.
Pollination occurs in ______.
Even in absence of pollinating agents seed-setting is assured in ______.
Which of the following plant contain unisexual flower?
During Hybridization process anther of the bisexual flower is removed before it dehisces is called ______.
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 |
What is epihydrophily?
