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प्रश्न
When and why does a plant breeder employ the emasculation technique?
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उत्तर
Plant breeders employed this technique to prevent pollination within the same flower or to pollinate stigmas with pollen of the desired variety. To remove the anthers, the flowers are covered with a bag before they open. This ensures that the flower is pollinated by pollen grains obtained from desirable varieties only. Later, the mature, viable, and stored pollen grains are dusted on the bagged stigma by breeders to allow artificial pollination to take place and obtain the desired plant variety.
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संबंधित प्रश्न
Why do moss plants produce very large number of male gametes? Provide one reason. What are these gametes called?
Explain the post-pollination events leading to seed production in angiosperms.
List the different types of pollination depending upon the source of pollen gain.
Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.
What is meant by emasculation?
Give the floral adaptations for anemophily.
The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as ______.
Draw a diagram of a section of a megasporangium of an angiosperm and label funiculus, Micropyle, embryosac and nuclleus.
Describe the structure of its microsporangium.
Write two ways in which pollination may occur in plants.
Define the term Pollinating.
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.
Give one word/term for the following:
Pollination of flowers by birds.
In bisexual flowers, maturation of gynoecium before androecium is known as ______.
Put a tick mark (✓) against the correct alternative in the following statements
Vegetative propagation is not observed in:
What are the adaptations which are required in cross-pollinated
For which of the following attractants and rewards are required?
A dioecious flowering plant prevents both ______.
Chief pollinators of agricultural crops are ______.
Anemophily type of pollination is found in ______.
Feathery stigma occurs in ______.
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 |
Which one of the following may require pollinators, but is genetically similar to autogamy?
Advantage of cleistogamy is:
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
What is ornithophily?
Briefly discuss any two methods by which plants avoid self-pollination.
Comparatively a large amount of pollen grains are wasted during ______.
