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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?
Geitonogamous flowering plants are genetically autogamous but functionally cross-pollinated. Justify.
What are chasmogamous flowers?
Add a note on pollination mechanism in Salvia.
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.
Define the term Pollinating.
Fill in the blanks with suitable words.
_______ is a water-pollinated flower.
Give one word/term for the following:
When stigma and anthers do not grow up to the same height, which favors only cross-pollination.
Give one word/term for the following:
Pollination of flowers by birds.
Describe the advantages and disadvantages of cross-pollination to the plant.
In bisexual flowers, maturation of gynoecium before androecium is known as ______.
Give four adaptations shown by flowers pollinated by wind.
The question has four options. Choose the correct answer:
Pollination by insect is known as
Choose the correct statement from the following.
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 ______.
Male and female flowers are present on different plants (dioecious) to ensure xenogamy, in ______.
Plants with ovaries having only one or a few ovules are generally pollinated by ______.
The flower which possesses both androecium and gynoecium is called perfect or ______.
In the dioecious aquatic plant shown, identify the characteristics of the male flowers that reach the female flowers for pollination:
| Size of the flower | Colour of flower | The characteristic feature of pollen grain | |
| A | small | brightly coloured | Lightweight and non-sticky |
| B | large | colourless | large and sticky |
| C | small | white | small, covered with mucilage |
| D | large | colourless | non-sticky |
Correct definition of pollination is ______
Autogamy can occur in a chasmogamous flower if ______.
Choose the correct statement from the following:
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
What are the major abiotic factors that influence habitat?
When and why does a plant breeder employ the emasculation technique?
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:
