Question

Thallophyta Bryophyta and petdriophyta are called gymnosperms , cyptosperms and angiosperms. Explain.

Answer 1

because they have hidden reproductive organ as well as reproductive tissues and embroy which stores food and later turn into seed

Answer 2

gymnosperms are non flowering plant.
gymno means naked and sperms means seeds. thus thallophyta has naked seeds or they are non flowering thus they called as gymnosperms. similarly, petdriopyta has seeds and flowering plant so it called as angiosperm plant.