Give the salient features and importance of chrysophytes.

Explanation

A . (1) This group includes diatoms and desmids (golden algae).
(2) They are green, microscopic, float in water currents.
(3) In diatoms the cell walls form two thin overlapping shells, epitheca and hypotheca which fit together as in a soap box. (5) Diatoms are divided into two types based on symmetry.
(i) Central diatoms are radially symmetrical.
(ii) Pennales are bilaterally symmetrical
(6) Asexual reproduction is by binary fission and sexual
reproduction is by the formation of gametes.