Thallophyta, bryophyta and pteridophyta are called as 'cryptogams'. Gymnosperms and angiosperms are called as 'phanerogams'. Discus why? Draw one example of gymnosperm.

Explanation

Cryptogams are seedless plants. The reproductive organs of members of cryptogams are inconspicous or hidden. They produce naked embryos after fertilisation that are called spores.

Cryptogams are further divided into thallophytes (undifferentiated body), Bryophyta (moss plant) and pteridophytes (vascular cryptogams).
Plants which make seeds and have well-differentiated reproductive tissues are called phanerogams. In these plants seeds consists of embryo along with stored food. The stored food serves the purpose of initial growth of the embryo during germination.
On the basis of presence or absence of naked seeds, these are divided into two groups (i) gymnosperms (naked seed) (ii) angiosperms (covered seed).