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Question
What is self-incompatibility?
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Solution
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.
RELATED QUESTIONS
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 ?
Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination.
What is meant by emasculation?
Give the floral adaptations for anemophily.
Find the odd-one out, giving reason:
Ovary, style, pollen grain, stigma
Give one word/term for the following:
When stigma and anthers do not grow up to the same height, which favors only cross-pollination.
Give four adaptations shown by flowers pollinated by wind.
- Nucellus
- Antipodals
- Synergids
- Micropyle
What is a flower? Draw a typical flower and label its different parts.
What are the adaptations which are required in cross-pollinated
Very short answer type question:
What is hydrophily?
Give an account of any two biotic agents for pollination along with their adaptations.
For which of the following attractants and rewards are required?
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
Pollination by water occurs in ______.
Which of the following pair has haploid structures?
Anemophily type of pollination is found in ______.
Feathery stigma occurs in ______.
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 ______
Pollination in water lilies is carried out by ______.
Describe any three adaptations in hydrophilous flowers.
Mention any one example of the hydrophilous flower.
What is epihydrophily?
Give any four floral adaptations for chiropterophily.
Name the following:
Aquatic plants which are anemophilous.
When and why does a plant breeder employ the emasculation technique?
In sea grass, pollens are long, ribbon like and without exine exhibiting ______ pollination.
