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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
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.
Describe the characteristic features of wind pollinated flowers.
List the different types of pollination depending upon the source of pollen gain.
Name the part of the flower which the tassels of the corn- cob represent.
What are chasmogamous flowers?
Give the floral adaptations for anemophily.
Name two characteristics of flowers in which pollination occur by wind.
State the name of the chief pollinating agent against the corresponding plant by choosing from those given in brackets.
Dahlia_______ .
In bisexual flowers, maturation of gynoecium before androecium is known as ______.
Differentiate Between Cross Pollination and Self Pollination:
Which of these is a condition that makes flowers invariably autogamous?
The flower which possesses both androecium and gynoecium is called perfect or ______.
The flower which does not open at all are called ______.
Which one of these statements is incorrect?
The following statements seem to describe the water-pollinated submerged plants.
Correct definition of pollination is ______
Describe any three adaptations in anemophilous flowers.
Identify the set of correct statements:
- The flowers of Vallisneria are colourful and produce nectar.
- The flowers of waterlily are not pollinated by water.
- In most of water-pollinated species, the pollen grains are protected from wetting.
- Pollen grains of some hydrophytes are long and ribbon like.
- In some hydrophytes, the pollen grains are carried passively inside water.
Choose the correct answer from the options given below:
What is the definition of pollination?
Which of the following is classified as biotic agents of pollination?
