Heterosporous pteridophyte includes both:

1. Lycopodium and Equisetum

2. Selaginella and Salvinia

3. Psilotum and Phylloglossum

4. Selaginella and Equisetum

The given diagram shows :

In bryophytes and pteriodophytes, transport of male gametes requires

1. insects

2. birds

3. water

4. wind

Compared with the gametophytes of the bryophytes, the gametophytes of vascular plants tends to be

Which one of the following is considered important in the development of seed habit?