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प्रश्न
What is self-incompatibility?
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उत्तर
Self-incompatibility is a genetic mechanism in angiosperms that prevents self-pollination. It develops genetic incompatibility between individuals of the same species or between individuals of different species. The pollen grains of an anther do not germinate on the stigma of the same flower.
APPEARS IN
संबंधित प्रश्न
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?
Mention two strategies that evolved to prevent self-pollination in flowers.
Add a note on pollination mechanism in Salvia.
Draw a diagram of a section of a megasporangium of an angiosperm and label funiculus, Micropyle, embryosac and nuclleus.
Name of the part of the ovary which gives rise to:
Fruit ______
When maturation time of reproductive parts in a flower is different.
Give one word/term for the following:
When stigma and anthers do not grow up to the same height, which favors only cross-pollination.
In bisexual flowers, maturation of gynoecium before androecium is known as ______.
Describe the Advantages and Disadvantages of self-pollination to the Plant.
Autogamy can occur in a chasmogamous flower if ______.
Chief pollinators of agricultural crops are ______.
Feathery stigma occurs in ______.
Pollination refers to the ______.
Which type of pollination does the figure indicate?
Choose the correct statement from the following:
Describe any three adaptations in anemophilous flowers.
What is epihydrophily?
Complete the following table:
| Sr. | Type of pollination | Agent | Kind of flower | Examples |
| (i) | ______ | Wind | ______ | Maize |
| (ii) | Chiropterophily | ______ | Dull colour, with strong fragrance, abundant nectar | Adansonia |
| (iii) | Entamophily | Insects | ______ | Rose/Jasmine |
| (iv) | Ornithophily | ______ | Brightly coloured, large and showy. They secrete profuse, dilute n ectar | ______ |
