Question

advantages and disadvantages of the cross pollination in plant

Answer 1

Advantages of Self Pollination:

1. It maintains the parental characters or purity of the race indefinitely.

2. Self pollination is used to maintain pure lines for hybridisation experiments.

3. The plant does not need to produce large number of pollen grains.

4. Flowers do not develop devices for attracting insect pollinators.

5. It ensures seed production. Rather it is used as fail safe device for cross-pollinated flowers.


6. Self pollination eliminates some bad recessive characters.

Contrivances (Devices) to Ensure Self Pollination:

(1) Flowers are bisexual and both sexes mature at the same time (homogamy).

(2) In some cases, flowers are bisexual and cleistogamous, i.e., remain closed.

(3) Pollination occurs in bud condition before the opening (anthesis) of flower.

Disadvantages of Self Pollination:

1. New useful characters are seldom introduced.

2. Vigour and vitality of the race decreases with prolonged self pollination.

3. Immunity to diseases decreases.

4. Variability and hence adaptability to changed environment are reduced.

Answer 2

HI

NITIN

HERE IS THE ANSWER 

Disadvantages to cross pollination. For one, Diffen points out that it prevents uniform progeny and the purity of the genetic pool. It is also hard to guarantee cross pollination. In some cases this means that there is too much distance between plants or not enough pollinators, like bees or other insects, to do the job.

Some plants, such as willows, have to be cross-pollinated because the male and female flowers are not on the same plants. In tropical regions, cross pollination occurs via hummingbird, rodents, bats and even lemurs. Occasionally snails act as cross pollinators. Some plants are pollinated by water and wind.

HOPE THIS IMAGE WOULD MAKE YOU UNDERSTAND MORE ABOUT CROSS-POLLINATION .