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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.
APPEARS IN
संबंधित प्रश्न
A flower of tomato plant following the process of sexual reproduction produces 240 viable seeds.
Answer the following questions giving reasons :
(a) What is the minimum number of pollen grains that must have been involved in the pollination of its pistil?
(b) What would have been the minimum number of ovules present in the ovary?
(c) How many megaspore mother cells were involved?
(d) What is the minimum number of microspore mother cells involved in the above case?
(e) How many male gametes were involved in this case?
Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination.
What is the bagging technique?
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 ______.
Describe the structure of its microsporangium.
Name two characteristics of flowers in which pollination occur by wind.
Differentiate between the following:
Self pollination and cross pollination.
Compare the characteristic features of insect pollinated and wind pollinated flowers. Explain how the respective features assist in pollination.
Which one of the following is one of the characteristics of self-pollinated flowers?
Fill in the blanks with suitable words.
Different timings for the maturation of gynoecium and androecium is called ________.
Give one word/term for the following:
Pollination of flowers by insects.
Give one word/term for the following:
Pollination of flowers by birds.
In bisexual flowers, maturation of gynoecium before androecium is known as ______.
Write different modes of pollination in detail with suitable examples.
Differentiate Between Cross Pollination and Self Pollination:
What are the adaptations which are required in self-pollinated plants?
Mention various adaptations for wind pollination.
Give an account of any two biotic agents for pollination along with their adaptations.
Give an account of various abiotic agencies used in pollination along with their adaptations for pollination.
Autogamy can occur in a chasmogamous flower if ______.
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 ______.
Anemophily type of pollination is found in ______.
Heterostyly as a contrivance for cross-pollination is found in ______.
The flower which possesses both androecium and gynoecium is called perfect or ______.
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?
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
Pollination in water lilies is carried out by ______.
Mention any one example of the anemophilous flower.
Which one of the following flower is hypohydrophilous?
