Question

Ecological cycling of which of the following is not assisted by microorganisms?

• A. Lead
• B. Nitrogen
• C. Carbon
• D. Phosphorus

Answer 1

The correct option is A Lead

The microorganisms are involved in the cycling of the nutrient elements between the geosphere and the atmosphere. The lead is a very toxic metal which causes lead poisoning on inhalation and ingestion. The ingestion of lead results in the death of the microbes. The other nutrients like the nitrogen, carbon and phosphorous are recycled by the microorganisms in order to make the nutrient in the available in the usable form.

Thus, the correct answer is option A.