Question

what are cryptograms and phanerogams

Answer 1

texts written in code are known as cryptograms.
old-fashioned term for spermatophyte is known as phanerogams

Answer 2

Cryptogams :-

Include thallophytes, the bryophytes and the pteridophytes.

they have naked embryos in form of spores.

they are inconspicuous and therfore they are called Cryptogams or those with hidden reproductive organs.

Phanerogams :-

Include gymnosperms and angiosperms.

well differentiated reproductive organs.

seeds may be enclosed or naked , embryos stored food for plants.