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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
Name the part of the flower which the tassels of the corn- cob represent.
Why angiosperm anthers are called dithecous?
What are chasmogamous flowers?
Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.
What is self-incompatibility?
Why does self-pollination not lead to seed formation in self-incompatible species?
Describe the structure of its microsporangium.
Name two characteristics of flowers in which pollination occur by wind.
Find the odd-one out, giving reason:
Ovary, style, pollen grain, stigma
Which one of the following is one of the characteristics of self-pollinated flowers?
Fill in the blanks with suitable words.
_______ is a water-pollinated flower.
When maturation time of reproductive parts in a flower is different.
Put a tick mark (✓) against the correct alternative in the following statements
Vegetative propagation is not observed in:
What are the adaptations which are required in self-pollinated plants?
Very short answer type question:
What is hydrophily?
Pollination by water occurs in ______.
Pollination occurs in ______.
Plants with ovaries having only one or a few ovules are generally pollinated by ______.
The flower which does not open at all are called ______.
Which one of these statements is incorrect?
The following statements seem to describe the water-pollinated submerged plants.
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?
Pollination refers to the ______.
What is ornithophily?
Consider the following statements depicting adaptation of flowers to carryout successful pollination.
- Stigma is long, sticky and unwettable.
- Sepals, petals or perianth (if present) have waxy coating.
- Stamens with long filament and versatile anthers.
- Tubular corolla is seen.
- Flowers are noctumal.
Which of the above statements clearly depict hydrophily?
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 |
Give any four floral adaptations for chiropterophily.
Name the following:
One plant each of Hypohydrophily and epihydrophily.
Comparatively a large amount of pollen grains are wasted during ______.
Entomophily refers to pollination by which agency?
