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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
Geitonogamous flowering plants are genetically autogamous but functionally cross-pollinated. Justify.
Mention two strategies that evolved to prevent self-pollination in flowers.
What is meant by emasculation?
Name two characteristics of flowers in which pollination occur by wind.
Fill in the blank:
Male sex cells in plants are called _________.
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.
State the name of the chief pollinating agent against the corresponding plant by choosing from those given in brackets.
Dahlia_______ .
Fill in the blanks with suitable words.
_______ is a water-pollinated flower.
Name of the part of the ovary which gives rise to:
Fruit ______
Coelacanth was caught in South Africa. State the significance of the discovery of Coelacanth in the evolutionary history of vertebrates.
What are the adaptations which are required in self-pollinated plants?
For which of the following attractants and rewards are required?
Choose the correct statement from the following.
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
Both chasmogamous and cleistogamous flowers are present in ______.
Heterostyly as a contrivance for cross-pollination is found in ______.
Insect pollinated flowers are ______.
Which one of these statements is incorrect?
The following statements seem to describe the water-pollinated submerged plants.
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 |
A botanist studying Viola (common pansy) noticed that one of the two flower types withered and developed no further due to some unfavorable condition, but the other flower type on the same plant survived and it resulted in an assured seed set. Which of the following will be correct?
Which one of the following may require pollinators, but is genetically similar to autogamy?
Describe any three adaptations in hydrophilous flowers.
What are the major abiotic factors that influence habitat?
Name the pollinating agent of a flowering plant with large and coloured flowers with sticky stigma. State one characteristic feature of the pollen grains produced in such flowers.
Anemophily is the process of pollination by which agent?
Which plant is an example of ornithophily?
Chiropterophily involves pollination by which organisms?
Geitonogamy is characterized by which of the following?
