Question

The pteridophyte showing heterospory is
options 1.lycopodium
2.selaginella
3.pteris
4.dryopteris​

Answer 1

2. selaginella

Explanation:

• Heterospory is shown by selaginella and Salvinia.
• This produces two different kinds of spores, thus it is more advanced than most of the members in its group.
• The two different kinds of spores are megaspores formed from megasporangia and microspores formed from microsporangia.
• Microspores produce male gametophyte while megaspore produces female gametophyte.
• Heterospory is essential for seed habit.
• Retention of gametophyte inside the sporophyte is a precursor for the seed habit.

Answer 2

Explanation:

Selaginella is the sole genus of vascular plants in the family Selaginellaceae, the spikemosses or lesser clubmosses. This family is distinguished from Lycopodiaceae by having scale-leaves bearing a ligule and by having spores of two types.