Environmental Science MCQs

✅ The correct answer is option B.
Animals that eat only plants are called herbivores (or primary consumers). Animals that eat other animals are called carnivores.

✅ The correct answer is option A.
The formula of exponential growth is dN/dt=rN where dN/dt is the rate of change in population size, r is the biotic potential and N is the population size.

✅ The correct answer is option A.
In tree-dominated ecosystems, the pyramid of numbers is inverted because there are the maximum number of producers present as compared to the consumers. In deep water ecosystems, the pyramid of biomass is upright because there are more number of phytoplanktons, followed by small fishes and then large fishes.

✅ The correct answer is option D.
Soil is a source of all minerals.

✅ The correct answer is option A.
UVB rays, which affect skin’s top layer, cause skin cancer and most sunburns. Although UVA and UVB rays pose the greatest risk for sun damage, people who work with welding torches or mercury lamps may be exposed to UVC rays, the most dangerous type of UV radiation.

✅ The correct answer is option C.
The global temperature has risen by about 8 degree celsius, since the peak of last glacialisation.

✅ The correct answer is option B.
In most areas, the warmest time of the day about 5 feet above the ground occurs: in the afternoon between 3 and 5 PM.

✅ The correct answer is option C.
Most commercial flights are confined to the troposphere, but high-level supersonic aircraft inject pollutants into the stratosphere, which leads to the thinning of the ozone layer. Of these nitrogen oxides are especially harmful.

✅ The correct answer is option B.
Soil erosion can be prevented by afforestation.

✅ The correct answer is option C.
Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere.