Question

Match the following:

A. Chemosynthetic bacteria	1. Consume sulphur
B. Photoautotrophic bacteria	2. Environmental balance
C. Saprophytic bacteria	3. Produce sulphur
D. Symbiotic bacteria	4. Synthesize vitamins in human gut

• A. A-1, B-3, C-2, D-4
• B. A-1, B-3, C-4, D-2
• C. A-3, B-1, C-2, D-4
• D. A-4, B-3, C-2, D-1

Answer 1

The correct option is A A-1, B-3, C-2, D-4

Chemosynthetic bacteria oxidize inorganic raw materials to make their own food. For example, Thiobacillus thiooxidans oxidizes sulphur to sulphate.

Photoautotrophic bacteria, which are not cyanobacteria, use substances other than water as reducing power. Many of them produce sulphur as a by-product.

Saprophytic bacteria break down organic matter and help to return inorganic raw materials to the environment.

Friendly symbiotic bacteria in our guts help us in many ways, one of which being the synthesis of vitamins B and K.