Answer:
The
thallophyta, bryophyta and pteridophyta are called as 'cryptogams' because the
reproductive organs of these groups are inconspicuous or hidden.
Seeds are absent. On the other hand 'Phanerogams' include gymnosperms and
angiosperms which have well differentiated reproductive tissue and the embryo
with stored food. Their embryo develops into seed.
The
main features of Pisces are:
(i) They are exclusively water living animals and include the fishes
(ii) Their skin is covered with scales/plates.
(iii) They obtain oxygen dissolved in water by using gills
(iv) The. body is streamlined, and a muscular tail is used
for movement.
(v) They are cold-blooded and their hearts have only two
chambers.
(vi) I hey lay eggs.
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