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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
With the help of a suitable example, explain protandry.
Why do moss plants produce very large number of male gametes? Provide one reason. What are these gametes called?
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?
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What is self-incompatibility?
Add a note on pollination mechanism in Salvia.
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Fill in the blank:
Male sex cells in plants are called _________.
Fill in the blanks:
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A versatile anther is an adaptation for _______ type of pollination.
State the name of the chief pollinating agent against the corresponding plant by choosing from those given in brackets.
Dahlia_______ .
Describe the advantages and disadvantages of cross-pollination to the plant.
- Nucellus
- Antipodals
- Synergids
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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:
Choose the correct statement from the following.
Chief pollinators of agricultural crops are ______.
Even in absence of pollinating agents seed-setting is assured in ______.
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Which type of pollination does the figure indicate?
Choose the correct statement from the following:
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
Name the following:
Aquatic plants which are anemophilous.
Name the following:
One plant each of Hypohydrophily and epihydrophily.
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