Environmental Science MCQs

✅ The correct answer is option A.
If the average temperature of the sun increased, the wavelength of peak solar emission would decrease.

✅ The correct answer is option C.
Though they once thrived throughout much of the Northern Hemisphere, today redwoods are only found on the coast from central California through southern Oregon. They do not live more than 50 miles inland, and are usually found in long belts, rather than small groves.

✅ The correct answer is option A.
Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere. CFCs and halons cause chemical reactions that break down ozone molecules, reducing ozone’s ultraviolet radiation-absorbing capacity.

✅ The correct answer is option A.
Complex interlinked food chain is called food web. The correct answer is food web. Food web is the complex of interlinked food chains in a particular ecosystem the channelizes the movement of energy from the one trophic level to the other trophic level of that ecosystem

✅ The correct answer is option D.
In freshwater a fish is hypertonic to its environment, it means fish is saltier and water continuously moves into the fishes body via Osmosis. Hence Many freshwater animals cannot live for long in sea water and vice versa mainly because of Osmotic problems. So the correct answer is ‘Osmotic problems’.

✅ The correct answer is option A.
Acids are substances that give up Hydrogen ions in solution. Acids are corrosive to metals while releasing Hydrogen gas, have a pH between 0 and 6.9 and are sour to the taste. There are many common substances that are acids: lemon juice (citric acid), vinegar (acetic acid), stomach acid, and soda pop (carbonic acid).

✅ The correct answer is option D.
Nearly all wild lions live in sub-Saharan Africa, but one small population of Asiatic lions exists in India’s Gir Forest. Asiatic lions and African lions are subspecies of the same species. Asiatic lions once prowled from the Middle East to India.

✅ The correct answer is option A.
The river which has high level of BOD is indicative of high pollution in the river as the dissolved oxygen available in the water is being used by the bacterias, and this result in less oxygen available to fish and other aquatic beings. Nitrates and phosphates contribute to high level of BOD.

✅ The correct answer is option D.
Ozone absorbs ultraviolet radiation but lets other types of radiation, such as visible light, pass through. Molecules of ozone absorb ultraviolet radiation. The ozone gas throughout the stratosphere is called the ozone layer. It absorbs harmful ultraviolet radiation from the Sun.

✅ The correct answer is option B.
The ozone hole is not technically a “hole” where no ozone is present, but is actually a region of exceptionally depleted ozone in the stratosphere over the Antarctic that happens at the beginning of Southern Hemisphere spring (August–October).