In This Post we are  providing Chapter-16 Environmental Issues Reproduction in Organism  NCERT MCQ for Class 12 Biology which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS  can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.

NCERT MCQ ON ENVIRONMENTAL ISSUES

1. Ultraviolet rays of the sunlight results in formation of

(a) Carbon monoxide

(b) Sulphur Dioxide

(c) Ozone

(d) Fluorides

Answer: (c) Ozone

2. Which of the following will not cause any atmospheric pollution?

(a) Hydrogen

(b) Sulphur Dioxide

(c) Carbon dioxide

(d) Carbon monoxide

Answer: (a) Hydrogen

 3. Sewage water can be purified for recycling with the action of

(a) aquatic plants

(b) penicillin

(c) microorganisms

(d) fishes

Answer: (c) microorganisms

 4. Today, concentration of greenhouse gases is high because of

(a) use of refrigerator

(b) increased combustion of oil and coal

(c) deforestation

(d) all of the above

Answer: (d) all of the above

 5. Photochemical smog is related to the pollution of

(a) soil

(b) water

(c) noise

(d) air

Answer: (d) air

 6. Most important causative pollutant of soil maybe

(a) plastics

(b) iron junks

(c) detergents

(d) glass junks

Answer: (a) plastics

 7. Taj Mahal is threatened due to the effect of

(a) chlorine

(b) sulphur dioxide

(c) oxygen

(d) hydrogen

Answer: (a) chlorine

 8. When huge amount of sewage is dumped into a river the BOD will

(a) increase

(b) remain unchanged

(c) slightly decrease

(d) decrease

Answer: (c) slightly decrease

 9. Which is a fungicide?

(a) 2,4-D

(b) DDT

(c) Bordeaux mixture

(d) BHC

Answer: (c) Bordeaux mixture

10. Rotenone is

(a) a bioherbicide

(b) an insect hormone

(c) a natural herbicide

(d) a natural insecticide

Answer: (b) an insect hormone

11. Which of the following is not produced as exhaust of vehicles?

(a) sulphur dioxide

(b) carbon dioxide

(c) carbon monoxide

(d) fly ash

Answer: (c) carbon monoxide

 12. Smog is

(a) smoke

(b) other name for dust storm

(c) moistened air gases

(d) smoke and fog

Answer: (c) moistened air gases

 13. The most dangerous metal pollutant of automobile exhaust is

(a) cadmium

(b) silver

(c) lead

(d) manganese

Answer: (c) lead

14. Which one of the following is a greenhouse gas?

(a) carbon dioxide

(b) carbon monoxide

(c) ozone

(d) oxygen

Answer: (a) carbon dioxide

 15. Smog produces

(a) O3

(b) NO2

(c) CH4

(d) Aluminum Ion

Answer: (d) Aluminum Ion

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