What is the nature of the cell wall in diatoms? What is diatomaceous earth? Mention any two economic uses of it. Name the group under which diatoms belong to Protista.

The cell wall of diatoms is unique and intricate, composed primarily of silica, which gives it a glass-like structure. This cell wall, known as a frustule, has two halves that fit together like a petri dish, providing protection and support to the cell.

Diatomaceous Earth

Diatomaceous earth is formed from the accumulated remains of diatoms, which are microscopic algae. When these organisms die, their silica-rich frustules settle to the bottom of water bodies, creating a sedimentary layer. This material is often mined and processed for various uses.

Economic Uses of Diatomaceous Earth

• Filtration: It is widely used in water filtration systems due to its porous nature, effectively trapping impurities.
• Abrasives: Diatomaceous earth serves as a mild abrasive in products like toothpaste and metal polishes.

Classification of Diatoms

Diatoms belong to the group called Bacillariophyta within the kingdom Protista. This classification highlights their unique characteristics and ecological importance.