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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?
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 200 viable seeds.
Answer the following questions giving reasons :
(a) What would have been the minimum number of ovules present in pre-pollinated pistil ?
(b) How many microscope mother cells would minimally be required to produce requisite number of pollen grains ?
(c) How many pollen grains must have minimally pollinated the carple ?
(d) How many male gametes would have used to produce these 200 viable seeds ?
(e) How many megaspore mother cells were required in this process ?
What is meant by emasculation?
The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as ______.
Write two ways in which pollination may occur in plants.
Name two characteristics of flowers in which pollination occur by wind.
Fill in the blank:
Male sex cells in plants are called _________.
Complete the following chart and rewrite.
| Sr.No. | Agencies | type of pollination |
| 1 | Water | .................... |
| 2 | ........................... | Entomophily |
| 3 | Bat | .................... |
| 4 | ....................... | Ornithophily |
(Or)
Explain outbreeding devices in angiospermic plants.
Compare the characteristic features of insect pollinated and wind pollinated flowers. Explain how the respective features assist in pollination.
Name of the part of the ovary which gives rise to:
Fruit ______
When maturation time of reproductive parts in a flower is different.
In bisexual flowers, maturation of gynoecium before androecium is known as ______.
Can a plant flowering in Mumbai be pollinated by pollen grains of the same species growing in New Delhi? Provide explanations to your answer.
What are the adaptations which are required in cross-pollinated
What are the adaptations which are required in self-pollinated plants?
Explain water pollination in detail with its types.
Give an account of any two biotic agents for pollination along with their adaptations.
Wind pollination is common in ______.
The flower which does not open at all are called ______.
In which one of the following pollination is autogamous?
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 |
What is hypohydrophily?
Give any four floral adaptations for chiropterophily.
What are the major abiotic factors that influence habitat?
Name the following:
One plant each of Hypohydrophily and epihydrophily.
Briefly discuss any two methods by which plants avoid self-pollination.
Chiropterophily involves pollination by which organisms?
