Question

Select the wrong statement.

(a) The walls of diatoms are easily destructible.

(b) ‘Diatomaceous earth’ is formed by the cell walls of diatoms.

(c) Diatoms are chief producers in the oceans.

(d) Diatoms are microscopic and float passively in water.

Answer 1

Ans: (a) The walls of diatoms are easily destructible.

Sol: Diatoms are marine or freshwater unicellular organisms which have cell walls (frustules) composed of pectin impregnated with silica and consisting of two halves, one overlapping the other. The siliceous frustules of diatoms do not decay easily.