There is no natural death in single-celled organisms like Amoeba and bacteria because:

1. They cannot reproduce sexually

2. They reproduce by binary fission

3. Parental body is distributed among the offspring

4. They are microscopic

Which of the following is a post-fertilisation event in flowering plants?

1. Transfer of pollen grains

2. Embryo development

3. Formation of flower

4. Formation of pollen grains

The number of chromosomes in the shoot-tip cells of a maize plant is 20. The number of chromosomes in the microspore mother cells of the same plant shall be:

1. 20

2. 10

3. 40

4. 15

The process of sexual reproduction which involves meiosis and syngamy is:

Grafting is not successful in monocots but is successful in dicots because they have:
1. Vascular bundles arranged in a ring
2. Cambium for secondary growth
3. Vessels with elements arranged end to end
4. Cork cambium

A scion is grafted on a stock. The quality of fruits produced will depend upon the genotype of:
1. Scion
2. Stock
3. Both 1. and 2.
4. None of the above

A prominent Indian botanist noted chiefly for his invention of the technique of test-tube fertilization of angiosperms is:

Consider the two statements:

1. Both I and II are correct and II explains I.
2. Both I and II are correct but II does not explain I.
3. I is correct and II is incorrect.
4. Both I and II are incorrect.

Which of the following is not always true for sexual mode of reproduction?
I. Separate sexes in the species
II. Gamete formation
III. Fertilization

A plant with both male flowers and female flowers is called as: