Environmental Science MCQs

✅ The correct answer is option D.
A mycorrhiza is a symbiotic association between a green plant and a fungus. The plant makes organic molecules such as sugars by photosynthesis and supplies them to the fungus, and the fungus supplies to the plant water and mineral nutrients, such as phosphorus, taken from the soil.

✅ The correct answer is option D.
Trifluoro methyl sulphurpentafluoride trap more heat.

✅ The correct answer is option C.
Precipitation is water released from clouds in the form of rain, freezing rain, sleet, snow, or hail. It is the primary connection in the water cycle that provides for the delivery of atmospheric water to the Earth. Most precipitation falls as rain.

✅ The correct answer is option B.
Without this greenhouse effect, the average surface temperature would be 255 degrees kelvin (-18 degrees Celsius or 0 degrees Fahrenheit); a temperature so low that all water on Earth would freeze, the oceans would turn into ice and life, as we know it, would not exist.

✅ The correct answer is option A.
The indoor pollutant radon which is a radioactive gas causes lung cancer.

✅ The correct answer is option C.
A film or layer of oil floating on an expanse of water.

✅ The correct answer is option A.
But sometimes extinctions happen at a higher and a faster rate than usual. Factors such as over-exploitation, large body size, small population, massive habitat loss and position at a higher trophic level favor extinction. A plant podophyllum is at the verge of extinction due to over-exploitation.

✅ The correct answer is option C.
The pyramid of biomass is inverted in fresh water ecosystem.

✅ The correct answer is option C.
The thermal belt refers to a mountainside zone where frost or freezing temperatures are less likely to occur than they are at either higher or lower elevations.

✅ The correct answer is option C.
The term insolation is derived from the words “incoming solar radiation”. Insolation is specifically applied to radiation which is arriving at earth’s atmosphere first and then earth surface.