Question

The ............ in microbial flora in the soil is an indicator of soil pollution.

• A. Decrease
• B. Increase
• C. Gradual increase and decrease
• D. None of the above

Answer 1

The correct option is A Decrease

When the soil is polluted, there is a decrease in the quality and fertility of the soil. The nutrients which were present in the soil has been lost. This results in a reduction in the number of microbes which were inhabited in the soil. So, when there is a decrease in the level of the microbial flora of the soil, it indicates that the soil has been polluted.

Thus, the correct answer is option A.