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प्रश्न
Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.
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उत्तर
Cross-pollination cannot occur in cleistogamous flowers. Cleistogamous flowers do not open at all. In these flowers, the anthers and stigma are close together; when the anthers dehisce in the flower buds, pollen grains touch the stigma, resulting in pollination. As a result, these flowers are always self-pollinated since they remain closed, and cross pollen cannot land on the stigma. Cleistogamous flowers can pollinate and set seeds without pollinators.
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संबंधित प्रश्न
List the different types of pollination depending upon the source of pollen gain.
Write two ways in which pollination may occur in plants.
Define the term Pollinating.
Can a unisexual flower be self pollinated?
Compare the characteristic features of insect pollinated and wind pollinated flowers. Explain how the respective features assist in pollination.
Fill in the blanks with suitable words.
Different timings for the maturation of gynoecium and androecium is called ________.
Name of the part of the ovary which gives rise to:
Fruit ______
Give one word/term for the following:
Pollination of flowers by insects.
Answer the following question.
Express the process of pollination in Vallisneria.
Put a tick mark (✓) against the correct alternative in the following statements
Vegetative propagation is not observed in:
What is a flower? Draw a typical flower and label its different parts.
What are the adaptations which are required in cross-pollinated
At which stage pollen grains are shed from the anther in Angiosperms?
Mention various adaptations for wind pollination.
Choose the correct statement from the following.
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
Both chasmogamous and cleistogamous flowers are present in ______.
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 ______.
During Hybridization process anther of the bisexual flower is removed before it dehisces is called ______.
The flower which does not open at all are called ______.
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 |
Pollination refers to the ______.
Which one of the following may require pollinators, but is genetically similar to autogamy?
Advantage of cleistogamy is:
Pollination in water lilies is carried out by ______.
What are the major abiotic factors that influence habitat?
Name the pollinating agent of a flowering plant with large and coloured flowers with sticky stigma. State one characteristic feature of the pollen grains produced in such flowers.
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:
