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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.
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संबंधित प्रश्न
With the help of a suitable example, explain protandry.
List the different types of pollination depending upon the source of pollen gain.
A flower of tomato plant following the process of sexual reproduction produces 240 viable seeds.
Answer the following questions giving reasons :
(a) What is the minimum number of pollen grains that must have been involved in the pollination of its pistil?
(b) What would have been the minimum number of ovules present in the ovary?
(c) How many megaspore mother cells were involved?
(d) What is the minimum number of microspore mother cells involved in the above case?
(e) How many male gametes were involved in this case?
What is meant by emasculation?
Give one word/term for the following:
Pollination of flowers by insects.
State four features of flowers pollinated by insects.
Put a tick mark (✓) against the correct alternative in the following statements
Pollen is produced in the
Describe the Advantages and Disadvantages of self-pollination to the Plant.
The question has four options. Choose the correct answer:
Pollination by insect is known as
At which stage pollen grains are shed from the anther in Angiosperms?
Mention various adaptations for wind pollination.
What are the different adaptations shown by bird-pollinated flowers?
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
Cleistogamous flowers are ______.
Both chasmogamous and cleistogamous flowers are present in ______.
Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by ______.
Pollination occurs in ______.
Which of these is a condition that makes flowers invariably autogamous?
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 |
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?
Correct definition of pollination is ______
Autogamy can occur in a chasmogamous flower if ______.
What is ornithophily?
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 |
Pollination in water lilies is carried out by ______.
Give any four floral adaptations for chiropterophily.
When and why does a plant breeder employ the emasculation technique?
