Which one of the following pairs of plants are not seed producers?

Characteristic of fern is

A mature pollen grain of Pinus has

‘Club moss’ belongs to

In pteridophyte, the sporophytes consist of leaf-like appendages called

The production of two distinct types of spores, megaspores and microspores, in plants like Selaginella and Salvinia is known as:

Horse tails and ferns are belongs to

The 'ligulate leaves' found in some pteridophytes are primarily associated with which genus?

In which plant group is the retention of the female gametophyte with the developing embryo on the parent sporophyte first observed as a significant evolutionary step?

In pteridophytes, gametophytes require …A… to grow

Heterosporous Pteridophyte is