NCERT Important Questions Class 9 Science biology Chapter 13
Important NCERT Extra Questions
Chapter 13 Why do We Fall ill
NCERT Book Extra Questions for Session 2022-2023
CBSE Board and UP Board Others state Board
What is correct? (a) A person strolling in the lawn of his/her house is relaxing or doing exercise. (b) Wearing socks and full sleeves at night will prevent the attack from dengue. (c) Regular use of ORS cures diarrhoea.
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(a) Strolling is no exercise as a person moves slowly. It is a way of relaxation where stress and strain can be
relieved.
(b) No. Dengue is caused by bite of Aedes aegypti mosquito which is active during day time only.
(c) Yes. ORS prevents dehydration. Diarrhoea is generally cured automatically after 1 to 2 days because it is
mostly viral infection.