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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
Describe the characteristic features of wind pollinated flowers.
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 ?
Why does self-pollination not lead to seed formation in self-incompatible species?
What is the bagging technique?
Give the floral adaptations for anemophily.
Differentiate between the following:
Self pollination and cross pollination.
Select and write the most appropriate answer from the given alternatives for the following subquestion:
A versatile anther is an adaptation for _______ type of pollination.
Describe the advantages and disadvantages of cross-pollination to the plant.
Type of interaction where an individual sacrifices its own welfare (life) for the benefit of another animal of its own species is ______.
What is a flower? Draw a typical flower and label its different parts.
Differentiate Between Cross Pollination and Self Pollination:
What are the adaptations which are required in cross-pollinated
The question has four options. Choose the correct answer:
Pollination by insect is known as
Very short answer type question:
What is hydrophily?
Wind pollination is common in ______.
Both chasmogamous and cleistogamous flowers are present in ______.
Even in absence of pollinating agents seed-setting is assured in ______.
Which of these is a condition that makes flowers invariably autogamous?
Insect pollinated flowers are ______.
Which type of flower has ovary superior?
The flower which does not open at all are called ______.
In the dioecious aquatic plant shown, identify the characteristics of the male flowers that reach the female flowers for pollination:
| Size of the flower | Colour of flower | The characteristic feature of pollen grain | |
| A | small | brightly coloured | Lightweight and non-sticky |
| B | large | colourless | large and sticky |
| C | small | white | small, covered with mucilage |
| D | large | colourless | non-sticky |
In which one of the following pollination is autogamous?
Choose the correct statement from the following:
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 | ______ |
Which one of the following flower is hypohydrophilous?
In sea grass, pollens are long, ribbon like and without exine exhibiting ______ pollination.
