Environmental Science MCQs

✅ The correct answer is option C.
The total number of major languages in India are 16.

✅ The correct answer is option A.
The outermost zone of a biosphere reserve ismanipulation zone. The transition area is the outermost part of a biosphere reserve. This is usually not delimited one and is a zone of cooperation where conservation knowledge and management skills are applied and uses are managed in harmony with the purpose of the biosphere reserve.

✅ The correct answer is option E.
A keystone species is a plant or animal that plays a unique and crucial role in the way an ecosystem functions.

✅ The correct answer is option A.
It hosts 4 biodiversity hotspots:the Himalayas, the Western Ghats, the Indo-Burma region and the Sundaland (Includes Nicobar group of Islands). These hotspots have numerous endemic species.

✅ The correct answer is option A.
As it travels along the food chain, the concentration of DDT increases.

✅ The correct answer is option C.
Water pollution can cause the outbreak of jaundice. Jaundice is caused by the organism Seriola quinqueradiata. The disease is characterised by yellow colorations of the skin, these yellow colourations are majorly due to the build-up of bilirubin in the blood.

✅ The correct answer is option A.
Organism that must consume other organisms to obtain food for energy.

✅ The correct answer is option D.
The principal greenhouse gases (GHGs) are carbon dioxide (CO2), water vapour (H2O), nitrous oxide (N2O), methane (CH4) and ozone (O3).

✅ The correct answer is option B.
The ratio of the mass of water vapour in a given volume (parcel) of air to the mass of the remaining dry air describes the mixing ratio.

✅ The correct answer is option E.
All of these are correct.