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प्रश्न
Choose the correct statement from the following:
पर्याय
Cleistogamous flowers always exhibit autogamy.
Chasmogamous flowers always exhibit geitonogamy.
Cleistogamous flowers exhibit both autogamy and geitonogamy.
Chasmogamous flowers never exhibit autogamy.
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उत्तर
Cleistogamous flowers always exhibit autogamy.
Explanation:
Cleistogamous flowers never open, so pollen from other plants cannot reach their stigma. This means they are always pollinated by their pollen, ensuring self-pollination (autogamy). This mechanism does not rely on external pollinating agents, making autogamy guaranteed in cleistogamous flowers.
APPEARS IN
संबंधित प्रश्न
Lever mechanism of pollination is observed in
- Salvia
- Jasmine
- Bougainvillea
- Butea
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?
Describe the characteristic features of wind pollinated flowers.
List the different types of pollination depending upon the source of pollen gain.
Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.
Mention two strategies that evolved to prevent self-pollination in flowers.
Why does self-pollination not lead to seed formation in self-incompatible species?
What is meant by emasculation?
Find the odd-one out, giving reason:
Ovary, style, pollen grain, stigma
Mention any two contrivances in flowers which favour cross-pollination.
Put a tick mark (✓) against the correct alternative in the following statements
Vegetative propagation is not observed in:
Describe the Advantages and Disadvantages of self-pollination to the Plant.
Give an account of any two biotic agents for pollination along with their adaptations.
Autogamy can occur in a chasmogamous flower if ______.
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
Anemophily type of pollination is found in ______.
Both chasmogamous and cleistogamous flowers are present in ______.
The flower which possesses both androecium and gynoecium is called perfect or ______.
Which type of flower has ovary superior?
Which one of these statements is incorrect?
The following statements seem to describe the water-pollinated submerged plants.
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 |
The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which, during pollination, brings genetically different types of pollen grains to stigma, is ______
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 |
Name the following:
Aquatic plants which are anemophilous.
