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