NCERT Important Questions Class 9 Science biology Chapter 14
Important NCERT Extra Questions
Chapter 14 Natural Resources
NCERT Book Extra Questions for Session 2022-2023
CBSE Board and UP Board Others state Board
Justify “Dust is a pollutant”.
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(i) Dust consists of suspended particles. The latter pass into nasal tract and cause a lot of discomfort including allergic asthma, bronchitis, cough and cold
(ii) Dust reduces light intensity
(iii) Dust particles are eye irritants.
(iv) Dust particles settle over plant foliage and reduce photosynthetic activity
(v) Dust particles block stomata reduces gaseous exchange in plants
(vi) Dust particles can pick up toxic metals and chemicals being emitted by industries