Question

Assertion – Pathogens are harmful to mankind.
Reason – They either kill or prevent the growth of microorganisms.

• A. If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
• B. If both Assertion and Reason are correct, but Reason is not
  the correct explanation of Assertion.
• C. If Assertion is correct but Reason is incorrect.
• D. If Assertion is incorrect but Reason is correct.

Answer 1

The correct option is C

If Assertion is correct but Reason is incorrect.

Option (C):
Assertion statement:

1. Microbes which cause disease are called pathogens.
2. Germs enter the host body and infect the healthy person.
3. Different pathogens cause different diseases.
4. Pathogen which causes typhoid is different from the pathogen which causes cholera.

Reason statement:

1. Pathogens are the microbes which cause disease.
2. Therefore, they neither kill nor prevent the growth of microorganisms.

Final answer: Assertion is correct but Reason is incorrect.