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NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES
1
Medium
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Understanding
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Read the following statements carefully and select the correct ones
I. UV rays essential for the production as well as degradation of ozone gas
II. Ozone present in ionosphere acts as a shield absorbing UV radiation coming from the sun
III. One fourth of the incoming solar radiation is reflected by the atmospheric gases and clouds and only half of the incoming solar radiation falls on the earth’s surface, heating it. Of this only a small portion is reflected back
I. UV rays essential for the production as well as degradation of ozone gas
II. Ozone present in ionosphere acts as a shield absorbing UV radiation coming from the sun
III. One fourth of the incoming solar radiation is reflected by the atmospheric gases and clouds and only half of the incoming solar radiation falls on the earth’s surface, heating it. Of this only a small portion is reflected back
View answer and explanation
Correct option: B
I and III
Option B (I and III) is correct. UV rays are involved in both the production and degradation of ozone, and the statement about solar radiation reflection and absorption is also accurate.
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(i) Lost of urea and phosphate fertilizer were used in the crops in the vicinity
(ii) The area was sprayed with DDT by an aircraft
(iii) The lake water turned green and stinky
(iv) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis. Which of the following is not used for disinfection of drinking water? World most problematic aquatic weed is