How many statements are correct with respect to chrysophytes? (i) They are found in the marine environment, freshwater organisms are very rare. (ii) In diatoms, the cell walls form two thick overlapping shells which fit together as in a soapbox. (iii) The cell membranes of diatoms are embedded with silica and accumulation of them over billions of years is referred to as "diatomaceous earth". (iv) Diatoms are the chief "Producers" in the oceans.

Question

How many statements are correct with respect to chrysophytes? (i) They are found in the marine environment, freshwater organisms are very rare. (ii) In diatoms, the cell walls form two thick overlapping shells which fit together as in a soapbox. (iii) The cell membranes of diatoms are embedded with silica and accumulation of them over billions of years is referred to as "diatomaceous earth". (iv) Diatoms are the chief "Producers" in the oceans. (A) 1 (B) 2 (C) 3 (D) 4

Tardigrade Admin · Accepted Answer

Chrysophytes include diatoms and golden algae. These are present in fresh water and marine water both. In diatoms the upper and lower walls are arranged as thin shells that fit together as a soap box. These walls are embedded with silica and this accumulate over time and this is known as diatomaceous earth. These appear gritty and this is used in polishing, filtration of oils and syrups. These and Dinoflagellates both are producers of this ocean