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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
With the help of a suitable example, explain protandry.
Geitonogamous flowering plants are genetically autogamous but functionally cross-pollinated. Justify.
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?
Why does self-pollination not lead to seed formation in self-incompatible species?
What is the bagging technique?
What is meant by emasculation?
Fill in the blank:
Male sex cells in plants are called _________.
Find the odd-one out, giving reason:
Ovary, style, pollen grain, stigma
Can a unisexual flower be self pollinated?
Fill in the blanks with suitable words.
Different timings for the maturation of gynoecium and androecium is called ________.
Type of Interaction where an individual sacrifices its own welfare (life) for the benefit of another animal of its own species is ______.
Give four adaptations shown by flowers pollinated by wind.
Answer the following question.
Express the process of pollination in Vallisneria.
Describe pollination. How many types of pollinations are found?
Write different modes of pollination in detail with suitable examples.
Differentiate Between Cross Pollination and Self Pollination:
What are the adaptations which are required in cross-pollinated
Very short answer type question:
What is hydrophily?
Give an account of various abiotic agencies used in pollination along with their adaptations for pollination.
Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by ______.
Even in absence of pollinating agents seed-setting is assured in ______.
Male and female flowers are present on different plants (dioecious) to ensure xenogamy, in ______.
Plants with ovaries having only one or a few ovules are generally pollinated by ______.
Which of these is a condition that makes flowers invariably autogamous?
The flower which possesses both androecium and gynoecium is called perfect or ______.
Which of the following plant contain unisexual flower?
Pollination refers to the ______.
Mention any one example of the anemophilous flower.
Mention any one example of the hydrophilous flower.
Name the pollinating agent of a flowering plant with large and coloured flowers with sticky stigma. State one characteristic feature of the pollen grains produced in such flowers.
