Question

Thallophyta, bryophyta and pteridophyta are called as cryptogams, gymnosperms and angiosperms are called as phanerogams. Discuss why? Write any one difference between monocotyledons and dicotyledons with example.

Answer 1

Thallophyta, Bryophyta, and pteridophyta are called cryptogams because the reproductive organs of these groups are inconspicious or hidden. Seeds are absent.

Gymnosperms and angiosperms are called phenerogams because they have well diffrentiated reproductive tissue and the embryo with stored food. Their embryo develops into seeds.

Monocot	Dicot
One cotyledon	Two cotyledons
Parallel vein in leaves	Reticulate vein in leaves
trimerous flower	tetramerous or pentamerous flower
Secondary growth absent	Secondary growth present
Adventitious root	tap root system