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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
With the help of a suitable example, explain protandry.
As a senior biology student you have been asked to demonstrate to the students of secondary level in your school, the procedure(s) that shall ensure cross-pollination in a hermaphrodite flower. List the different steps that you would suggest and provide reasons for each one of them.
Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination.
Give the floral adaptations for anemophily.
Complete the following chart and rewrite.
| Sr.No. | Agencies | type of pollination |
| 1 | Water | .................... |
| 2 | ........................... | Entomophily |
| 3 | Bat | .................... |
| 4 | ....................... | Ornithophily |
(Or)
Explain outbreeding devices in angiospermic plants.
Which one of the following is one of the characteristics of self-pollinated flowers?
State the name of the chief pollinating agent against the corresponding plant by choosing from those given in brackets.
Dahlia_______ .
When maturation time of reproductive parts in a flower is different.
Answer the following question.
Write the difference in the characteristics of the progeny produced as a result of the two processes.
Write different modes of pollination in detail with suitable examples.
The question has four options. Choose the correct answer:
Pollination by insect is known as
Very short answer type question:
What is hydrophily?
Mention various adaptations for wind pollination.
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 ______.
Which of these is a condition that makes flowers invariably autogamous?
The flower which possesses both androecium and gynoecium is called perfect or ______.
What is ornithophily?
What is epihydrophily?
In sea grass, pollens are long, ribbon like and without exine exhibiting ______ pollination.
