Environmental Science MCQs

✅ The correct answer is option C.
If very cold air is brought indoors and warmed with no change in its moisture content, the saturation vapour pressure of this air will increase and the relative humidity of this air will decrease.

✅ The correct answer is option A.
World Wetlands Day is celebrated every year on 2 February to raise global awareness about the value of wetlands for humanity and the planet. It also marks the adoption of the Ramsar Convention on Wetlands in 1971 in the Iranian city of Ramsar.

✅ The correct answer is option C.
Oxygen is the gas which is likely to be reduced in the atmosphere by deforestation. One of the most dangerous threats to life on earth is the increase in pollution which is caused because of the increase in the concentration of carbon dioxide and carbon monoxide in the environment.

✅ The correct answer is option C.
The relationship between nitrogen fixing bacteria and leguminous plants is an example for Mutualism.

✅ The correct answer is option C.
Pollution is any undesirable change in the physical, chemical or biological characteristics of air, water or land. Pollution can harm the health and threaten the survival or activities of human beings and other living organisms.

✅ The correct answer is option C.
both a and b

✅ The correct answer is option B.
A detritivore is an animal feeding on decaying organic matter. It is a heterotroph that obtains nutrients by consuming detritus. Examples include millipedes, earthworms, fiddler crabs, sea cucumbers.

✅ The correct answer is option A.
The pioneer species in xerarch and hydrarch succession are lichens and phytoplanktons respectively. Xerarch is a plant succession starting on bare ground or rock and culminating in a mature climax forest. The pioneer species, such as lichens and mosses, result in the gradual accumulation of soil.

✅ The correct answer is option C.
Minamata disease is caused by marine pollution.

✅ The correct answer is option D.
Just as the name suggests ecological pyramids are in the shape of a pyramid. The concept was first introduced by Charles Elton, the pioneer British Ecologist. The bottom of an ecological pyramid is the broadest and is occupied the producers, which form the first trophic level.