13. The maximum fixation of solar energy is done by:
(a) Bacteria(b) Protozoa(c) Green plants(d) Fungi
13. The maximum fixation of solar energy is done by: Read More »
12. “Green House Effect” means:
(a) Pollution in houses(b) Prevention of ultraviolet rays(c) Trapping of solar energy due to atmospheric carbon dioxide(d) None of these
12. “Green House Effect” means: Read More »
11. The largest source of pollution in the world is:
(a) Industrial effluents(b) Sewage and garbage(c) Automobile exhausts(d) Herbicides and insecticides
11. The largest source of pollution in the world is: Read More »
10. Which amongst the following pairs of organisms represents predator -prey relationship?
(a) Tiger and deer(b) Man and camel(c) Deer and rabbit(d) None of these
9. The most dangerous consequenc of excessiye deforestation is:
(a) Soil erosion(b) Loss of forest wealth(c) Loss of many valuable plants(d) None of these
9. The most dangerous consequenc of excessiye deforestation is: Read More »
7. Which of the following is biodegradable?
(a) Paper(b) D.D.T(c) Aluminium(d) Plastic
7. Which of the following is biodegradable? Read More »
6. Nutrients are recycled in the atmosphere with the help of certain micro-organisms referred to:
(a) Producers(b) Decomposers(c) Consumers(d) None of these
5. The study of relation of animals and plants to their surroundings is called:
(a) Ecology(b) Ethnology(c) Genealogy(d) Iconology
5. The study of relation of animals and plants to their surroundings is called: Read More »
4. Uncontrolled industrialisation leads to acid rain. It is mainly contributed by:
(a) Nitrous and sulphur oxide(b) Carbon dioxide(c) Methane gas(d) Chlorofluorocarbons
4. Uncontrolled industrialisation leads to acid rain. It is mainly contributed by: Read More »