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प्रश्न
What is meant by emasculation?
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उत्तर
Emasculation is the removal of stamens, mainly the anthers, from the flower buds before their dehiscence. The removal is mainly done to avoid self-pollination. Emasculation is one of the measures in the artificial hybridization.
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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.
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?
What are chasmogamous flowers?
What is the bagging technique?
Describe the structure of its microsporangium.
Select and write the most appropriate answer from the given alternatives for the following subquestion:
A versatile anther is an adaptation for _______ type of pollination.
Name of the parts of the ovary which give rise to:
Fruit wall ______
Give one word/term for the following:
Pollination of flowers by insects.
Mention any two contrivances in flowers which favour cross-pollination.
In bisexual flowers, maturation of gynoecium before androecium is known as ______.
Answer the following question.
Write the difference in the characteristics of the progeny produced as a result of the two processes.
Put a tick mark (✓) against the correct alternative in the following statements
Pollen is produced in the
Put a tick mark (✓) against the correct alternative in the following statements
Vegetative propagation is not observed in:
Differentiate Between Cross Pollination and Self Pollination:
At which stage pollen grains are shed from the anther in Angiosperms?
Pollination by water occurs in ______.
Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by ______.
Which of the following pair has haploid structures?
Anemophily type of pollination is found in ______.
Male and female flowers are present on different plants (dioecious) to ensure xenogamy, in ______.
Which of the following is not a water pollinated plant?
The flower which possesses both androecium and gynoecium is called perfect or ______.
The flower which does not open at all are called ______.
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?
Describe any three adaptations in anemophilous flowers.
Give any four floral adaptations for chiropterophily.
Comparatively a large amount of pollen grains are wasted during ______.
Which one of the following flower is hypohydrophilous?
Bird pollinated flowers are usually ______.
