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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.
Why does self-pollination not lead to seed formation in self-incompatible species?
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 ______.
Draw a diagram of a section of a megasporangium of an angiosperm and label funiculus, Micropyle, embryosac and nuclleus.
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.
Fill in the blanks with suitable words.
Different timings for the maturation of gynoecium and androecium is called ________.
Name of the parts of the ovary which give rise to:
Fruit wall ______
Give one word/term for the following:
When stigma and anthers do not grow up to the same height, which favors only cross-pollination.
State four features of flowers pollinated by insects.
Can a plant flowering in Mumbai be pollinated by pollen grains of the same species growing in New Delhi? Provide explanations to your answer.
- Nucellus
- Antipodals
- Synergids
- Micropyle
What is a flower? Draw a typical flower and label its different parts.
What are the different adaptations shown by bird-pollinated flowers?
For which of the following attractants and rewards are required?
Cleistogamous flowers are ______.
Both chasmogamous and cleistogamous flowers are present in ______.
Pollination by water occurs in ______.
Anemophily type of pollination is found in ______.
Which of these is a condition that makes flowers invariably autogamous?
The flower which possesses both androecium and gynoecium is called perfect or ______.
During Hybridization process anther of the bisexual flower is removed before it dehisces is 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?
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
Describe any three adaptations in anemophilous flowers.
Match the Column I with Column II.
| Column I | Column II |
| A. Pea | (i) Xenogamy |
| B. Jawar | (ii) Epihydrophily |
| C. Maize | (iii) Anemophily |
| D. Vallis | (iv) Bisexual |
| E. Cannabis | (v) Geitonogamy |
Which of the following floral adapation are adapted by hydrophilous flowers?
Briefly discuss any two methods by which plants avoid self-pollination.
Identify the set of correct statements:
- The flowers of Vallisneria are colourful and produce nectar.
- The flowers of waterlily are not pollinated by water.
- In most of water-pollinated species, the pollen grains are protected from wetting.
- Pollen grains of some hydrophytes are long and ribbon like.
- In some hydrophytes, the pollen grains are carried passively inside water.
Choose the correct answer from the options given below:
