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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.
संबंधित प्रश्न
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.
Name the part of the flower which the tassels of the corn- cob represent.
What are chasmogamous flowers?
Describe the structure of its microsporangium.
Name two characteristics of flowers in which pollination occur by wind.
Compare the characteristic features of insect pollinated and wind pollinated flowers. Explain how the respective features assist in pollination.
Exine and intine are the parts of
When maturation time of reproductive parts in a flower is different.
Coelacanth was caught in South Africa. State the significance of the discovery of Coelacanth in the evolutionary history of vertebrates.
What is a flower? Draw a typical flower and label its different parts.
Write different modes of pollination in detail with suitable examples.
Describe the Advantages and Disadvantages of self-pollination to the Plant.
At which stage pollen grains are shed from the anther in Angiosperms?
Mention various adaptations for wind pollination.
Explain water pollination in detail with its types.
Give an account of any two biotic agents for pollination along with their adaptations.
Pollination occurs in ______.
Which of the following pair has haploid structures?
Even in absence of pollinating agents seed-setting is assured in ______.
Pollination refers to the ______.
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 ______
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
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 |
Mention any one example of the hydrophilous flower.
Comparatively a large amount of pollen grains are wasted during ______.
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:
