Advertisements
Advertisements
Question
Enlist advantages and disadvantages of cross pollination
Advertisements
Solution
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.
APPEARS IN
RELATED QUESTIONS
Lever mechanism of pollination is observed in
- Salvia
- Jasmine
- Bougainvillea
- Butea
Why do moss plants produce very large number of male gametes? Provide one reason. What are these gametes called?
Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.
Fill in the blanks with suitable words.
_______ is a water-pollinated flower.
Give one word/term for the following:
Pollination of flowers by birds.
The question has four options. Choose the correct answer:
Pollination by insect is known as
Pollination by water occurs in ______.
Even in absence of pollinating agents seed-setting is assured in ______.
Which one of these statements is incorrect?
The following statements seem to describe the water-pollinated submerged plants.
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 |
