The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which during pollination, brings genetically different types of pollen grains to stigma, is:

In water hyacinth and water lily, pollination takes place by:

1. Water currents only

2. Wind and water

3. Insects and water

4. Insects or wind

Which of the following is incorrect for wind-pollinated plants?

1. Well exposed stamens and stigma

2. Many ovules in each ovary

3. Flowers are small and not brightly colored

4. Pollen grains are light and non-sticky

What type of pollination takes place in Vallisneria?

In which one of the following, both autogamy and geitonogamy are prevented?

1. Wheat

2. Papaya

3. Castor

4. Maize

Given below are two statements:
I: Cleistogamous flowers are invariably autogamous
II: Cleistogamy is disadvantageous as there is no chance for cross pollination
In the light of the above statements, choose the correct answer from the options given below:
1. I is incorrect but II is correct
2. Both I and II are correct
3. Both I and II are incorrect
4. I is correct but II is incorrect

Bee-keeping helps to improve the yield of following crops Except ____________. 
1. Jowar 
2. Sunflower 
3. Apple 
4. Mustard