Question

Identify the correct statement(s) about diatoms.
I. The cell wall is composed of cellulose.
II. They are macroscopic.
III. Diatomaceous earth is formed by the cell wall of diatoms.
IV. Diatoms belong to the division Chrysophyta.
V. Diatoms are the chief producers of the oceans.

Answer 1

Chrysophyta are protists which are mostly aquatic and photosynthetic - hence referred as phytoplanktons or the chief producers of the oceans. Their cell wall is composed of silica. These are unicellular and microscopic.

Chrysophyta has two types:
1. Diatoms - Deposition of diatoms cell wall forms diatomaceous earth.
2. Desmids