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प्रश्न
Enlist advantages and disadvantages of cross pollination
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
With the help of a suitable example, explain protandry.
The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as ______.
Exine and intine are the parts of
What are the different adaptations shown by bird-pollinated flowers?
Both chasmogamous and cleistogamous flowers are present in ______.
Anemophily type of pollination is found in ______.
Match the Column I with Column II.
| Column I | Column II |
| A. Pea | (i) Xenogamy |
| B. Jawar | (ii) Epihydrophily |
| C. Maize | (iii) Anemophily |
| D. Vallis | (iv) Bisexual |
| E. Cannabis | (v) Geitonogamy |
Mention any one example of the hydrophilous flower.
Briefly discuss any two methods by which plants avoid self-pollination.
When and why does a plant breeder employ the emasculation technique?
