Light emitted by sun reaches earth in:
A.8 seconds
B.10 seconds
C.12 seconds
D.20 seconds
Category: Biosphere Mcqs
If all the plants of the World die, all the animals will also die due to shortage of:
A.Cold air
B.Oxygen
C.Food
D.Shelter
The maximum biological magnification of DDT through food web is seen in:
A.Algae
B.Bacteria
C.Man
D.Higher plants
Which amongst the following pairs of organisms represents predator – prey relationship?
A.Tiger and deer
B.Man and camel
C.Deer and rabit
D.None of these
A microscopic organism playing a vital role in nitrogen cycle is:
A.Virus
B.Bacteria
C.Protozoa
D.Red algae
Which of the following is usually not an air pollutant?
A.Hydrocarbons
B.Nitrous oxide
C.Sulphur oxide
D.Carbon dioxide
Which of the following is biodegradable?
A.Paper
B.D.D.T
C.Aluminium
D.Plastic
Which of the following chemicals is responsible for the depletion of ozone layer in the atmosphere?
A.Chlorofluorocarbons
B.Nitrous oxide
C.Sulphur oxide
D.Carbon oxide
The crop most susceptible to frost is:
A.Wheat
B.Cotton
C.Red gram
D.Black gram
Organisms at the base of the food chain are:
A.Photosynthetic plants
B.Decomposers
C.Carnivores
D.Herbivores
