Environmental Science MCQs

Question 1

Endoderm forms

Accepted Answer

viscera and digestive system

Answer

blood and bone

Answer

respiratory system

Answer

nervous system

Question 2

Which phytoplankton exists at the size of 60 micro metre?

Accepted Answer

Nanoplankton

Answer

Ultraplankton

Answer

Net plankton

Answer

Picoplankton

Question 3

Sea water is

Accepted Answer

alkaline

Answer

acidic

Answer

neutral

Answer

hypotonic

Question 4

Name the endangered animal which is protected in Rajamalai National Park

Accepted Answer

Nilgiri Tahr

Answer

Chital

Answer

Black buck

Question 5

Nitrogen gas returns to the atmosphere by the action of

Accepted Answer

Denitrifying bacteria

Answer

Nitrogen fixing bacteria

Answer

Nitrifying bacteria

Answer

Nitrate fertilizers

Question 6

The most abundant gases in the earth's atmosphere by volume are:

Accepted Answer

Nitrogen and oxygen

Answer

Carbon dioxide and nitrogen

Answer

Oxygen and water vapor

Answer

Oxygen and helium

Question 7

Cigarette smoking exposes one to __________

Accepted Answer

Carbon monoxide

Answer

Sulphur dioxide

Answer

Carbon dioxide

Answer

Nitrogen peroxide

Question 8

Of the gases listed below, which is not believed to be responsible for enhancing the earth's greenhouse effect?

Accepted Answer

Molecular oxygen (O2)

Answer

Chlorofluorocarbons (CFCs)

Answer

Nitrous oxide (N2O)

Answer

Carbon dioxide (CO2)

Question 9

The thickness of ozone layer is measured in

Accepted Answer

Du

Answer

Mm

Answer

Nm

Answer

Hg