Home
Class 12
BIOLOGY
Assertion : BOD of river polluted by sew...

Assertion : BOD of river polluted by sewage is more than 20 ppm.
Reason: Polluted river contains excess of organic matter.

A

If both are true with reason being correct explanation

B

Both true but reason is not correct explanation

C

assertion is true but reason is wrong

D

Both are wrong

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • ENVIRONMENTAL ISSUES

    DINESH PUBLICATION|Exercise Check your grasp|18 Videos

  • ENVIRONMENTAL ISSUES

    DINESH PUBLICATION|Exercise Brain teasers-X|145 Videos

  • ECHINODERMATA

    DINESH PUBLICATION|Exercise REVISION QUESTIONS|65 Videos

  • EVIDENCES OF EVOLUTION

    DINESH PUBLICATION|Exercise CHECK YOUR GRASP|3 Videos

Similar Questions

Explore conceptually related problems

River Pollution

Assertion: A mere 0.1 per cent impurities make domestic sewage unfit for human use. Reason: Domestic sewage primarily contains biodegradable organic matter.

Organic matter is considered as a major source of water pollution caused by wastes of food , animal and human excreta, garbage etc. the excess of organic matter in water causd a threat to aquatic life because

Assertion (A) : The lower the concentration of DO , the the more polluted is the water sample. Reason (R) : Oxygen is consumed by microbes for the decomposition of organic matter present in water.

Assertion: Water pollutants are measured by BOD. Reason: If BOD is more, the water is polluted.

Which is the most polluted river of India?