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प्रश्न
When and why does a plant breeder employ the emasculation technique?
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उत्तर
Plant breeders employed this technique to prevent pollination within the same flower or to pollinate stigmas with pollen of the desired variety. To remove the anthers, the flowers are covered with a bag before they open. This ensures that the flower is pollinated by pollen grains obtained from desirable varieties only. Later, the mature, viable, and stored pollen grains are dusted on the bagged stigma by breeders to allow artificial pollination to take place and obtain the desired plant variety.
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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?
Name the part of the flower which the tassels of the corn- cob represent.
Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination.
What is self-incompatibility?
Why does self-pollination not lead to seed formation in self-incompatible species?
What is the bagging technique?
Draw a diagram of a section of a megasporangium of an angiosperm and label funiculus, Micropyle, embryosac and nuclleus.
Write two ways in which pollination may occur in plants.
Name two characteristics of flowers in which pollination occur by wind.
Fill in the blanks:
The two kinds of pollination are __________ and __________.
Find the odd-one out, giving reason:
Ovary, style, pollen grain, stigma
Differentiate between the following:
Self pollination and cross pollination.
Give one word/term for the following:
Pollination of flowers by insects.
Differentiate between geitonogamy and xenogamy (allogamy).
Can a plant flowering in Mumbai be pollinated by pollen grains of the same species growing in New Delhi? Provide explanations to your answer.
Coelacanth was caught in South Africa. State the significance of the discovery of Coelacanth in the evolutionary history of vertebrates.
Write different modes of pollination in detail with suitable examples.
Describe the Advantages and Disadvantages of self-pollination to the Plant.
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.
Pollination by water occurs in ______.
Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by ______.
A dioecious flowering plant prevents both ______.
Feathery stigma occurs in ______.
Which of the following is not a water pollinated plant?
Pollination refers to the ______.
Briefly discuss any two methods by which plants avoid self-pollination.
In sea grass, pollens are long, ribbon like and without exine exhibiting ______ pollination.
