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प्रश्न
Enlist advantages and disadvantages of cross pollination
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उत्तर
Advantages of cross pollination:
i. Offsprings produced are healthier and are well adapted to the environment.
ii. Seeds are produced in large numbers with higher viability and of better quality.
iii. Possibility of variations results in new desired varieties of plants, hence favours the process
of evolution.
iv. The offsprings show better vigour (hybrid vigour) and vitality.
Disadvantages of cross pollination:
i. The plants have to depend upon various external agencies.
ii. There is expenditure of energy due to the adaptations such as bright colour, nectar, fragrance,
etc. in attracting insects.
iii. There is considerable wastage of pollen grains.
iv. Since cross pollination result in the formation of new genotypes, it may also develop
undesirable characters in the progeny. Some desirable characters may get eliminated.
v. Genetic purity is not maintained.
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संबंधित प्रश्न
Explain the post-pollination events leading to seed production in angiosperms.
Name of the part of the ovary which gives rise to:
Fruit ______
Name of the parts of the ovary which give rise to:
Fruit wall ______
State four features of flowers pollinated by insects.
What are the adaptations which are required in self-pollinated plants?
Wind pollination is common in ______.
Heterostyly as a contrivance for cross-pollination is found in ______.
The flower which does not open at all are called ______.
Name the following:
One plant each of Hypohydrophily and epihydrophily.
Comparatively a large amount of pollen grains are wasted during ______.
