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प्रश्न
What is self-incompatibility?
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उत्तर
Sexual incompatibility occurs when a pistil with functioning female gametes fails to establish seeds after pollination with viable and fertile pollen capable of fertilizing another pistil. Sexual incompatibility can arise between members of different species or within the same species. The condition is also known as self-incompatibility.
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संबंधित प्रश्न
As a senior biology student you have been asked to demonstrate to the students of secondary level in your school, the procedure(s) that shall ensure cross-pollination in a hermaphrodite flower. List the different steps that you would suggest and provide reasons for each one of them.
Why do moss plants produce very large number of male gametes? Provide one reason. What are these gametes called?
What are chasmogamous flowers?
Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.
Why does self-pollination not lead to seed formation in self-incompatible species?
Add a note on pollination mechanism in Salvia.
Describe the structure of its microsporangium.
When maturation time of reproductive parts in a flower is different.
State four features of flowers pollinated by insects.
Give four adaptations shown by flowers pollinated by wind.
Write different modes of pollination in detail with suitable examples.
The question has four options. Choose the correct answer:
Pollination by insect is known as
Very short answer type question:
What is hydrophily?
Explain water pollination in detail with its types.
Give an account of any two biotic agents for pollination along with their adaptations.
For which of the following attractants and rewards are required?
Choose the correct statement from the following.
A dioecious flowering plant prevents both ______.
Both chasmogamous and cleistogamous flowers are present in ______.
Male and female flowers are present on different plants (dioecious) to ensure xenogamy, in ______.
Insect pollinated flowers are ______.
Which one of these statements is incorrect?
The following statements seem to describe the water-pollinated submerged plants.
Which type of pollination does the figure indicate?
Advantage of cleistogamy is:
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 ______
Autogamy can occur in a chasmogamous flower if ______.
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 |
Mention any one example of the anemophilous flower.
Briefly discuss any two methods by which plants avoid self-pollination.
