Pollen tablets are available in the market for:

1. In vitro fertilization

2. Breeding programmes

3. Supplementing food

4. Ex situ conservation

Which one of the following statements is correct?

1. Sporogenous tissue is haploid

2. Endothecium produces the microspores

3. Tapetum nourishes the developing pollen

4. Hard outer layer of pollen is called intine