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5Dec19 SS Q20

0. Given below are two statements - one is labelled as Assertion (A) and the other is labelled as Reason(R):
Assertion (A): Forests help in improving the air quality of a place.
Reasons (R): Some tree species emit volatile organic compounds (VOCS) such as isoprene which may contribute to formation of tropospheric ozone.
In the light of the above statements choose the correct option:

  • Option : B
  • Explanation :
    Forests improve air quality by absorbing carbon dioxide which traps much more heat from the sun than is required, leading to global warming. So, Assertion (A) is true. Breathing ozone can trigger a variety of health problems including chest pain, coughing, throat irritation, and airway inflammation. It also can reduce lung function and harm lung tissue. Tropospheric ozone is a highly reactive oxidant that significantly reduces crop productivity as well as the uptake of atmospheric carbon by vegetation. It impedes plant growth and seed production, reduces functional leaf area and accelerates ageing. So, Reason (R) is true but does not explain (A).
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