Free Environmental Issues (Daily Quiz: 2) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Question-1

Assertion:
Presence of large amounts of nutrients in waters also causes excessive growth of planktonic (free-floating) algae, called algal bloom.
Reason:
Algal bloom imparts a distinct colour to the water bodies.

(a) If both the assertion and reason are true but the reason is not a correct explanation of the assertion.

(b) If both the assertion and the reason are true and the reason is a correct explanation of the assertion.

(c) If the assertion is true but the reason is false.

(d) If both the assertion and reason are false.

Question-2

Which of the following is absent in polluted water ?

(a) Water hyacinth

(b) Hydrilla

(c) Larva of stone fly

(d) Blue-green algae

Question-3

Stirred-tank bioreactors have been designed for

(a) Purification of the product

(b) Addition of preservatives to the product

(c) Ensuring anaerobic conditions in the culture vessel

(d) Availability of oxygen throughout the process

Question-4

In the textbook you same across three mile island and Chernobyl disasters associated with accidental leakage of radioactive wastes. In India we had Bhopal gas tragedy. It is associated with which of the following?

(a) Methyl isocyanate

(b) CO2

(c) CFC's

(d) Methyl cyanate

Question-5

The term 'Terror of Bengal' is used for

(a) decreased biological oxygen demand

(b) Eichhornia crassipes

(c) biomagnification

(d) algal bloom