MCQ Natural Resources | NCERT Class 9 Science

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MCQ Natural Resources - Biosphere — **Biosphere**

Online Test | MCQ Natural Resources | NCERT Class 9 Science Chapter 14 | CBSE Syllabus

Every student of class 9 of NCERT/CBSE syllabus may take part this online test of NCERT Class 9 Science Chapter 14 MCQ Natural Resources and verify his score to check preparedness

#1. An increase in carbon dioxide content in the atmosphere would not cause

a) more heat to be retained by the environment.

b) increase in photosynthesis in plants.

c) global warming.

d) abundance of desert plants.

#2. Which one is correct?

a) CO₂ in atmosphere -> Decomposers -> Organic carbon in animals -> Organic carbon in plants

b) CO₂ in atmosphere -> Organic carbon in plants -> Organic carbon in animals -> Inorganic carbon in soil

c) Inorganic carbonates in water -> Organic carbon in plants -> Organic carbon in animals -> Scavengers

d) Organic carbon in animals -> Decomposers -> CO₂ in atmosphere -> Organic carbon in plants

#3. Marked temperature changes in aquatic environment can affect

a) breeding of animals

b) more growth of aquatic plants

c) process of digestion in animals

d) availability of nutrients

#4. Ozone-hole means

a) a large sized hole in the ozone layer

b) thinning of ozone layer

c) small holes scattered in the ozone layer

d) thickening of ozone in the ozone layer

#5. What would happen, if all the oxygen present in the environment is converted to ozone?

a) We will be protected more.

b) it will become poisonous & kill living forms.

c) Ozone is not stable, hence it will be toxic.

d) I will help harmful sun radiations to reach earth & damage many life forms.

#6. Major source of mineral in soil is the

a) bacteria

b) plants

c) animals

d) parent rock from which soil is formed

#7. Total surface of the Earth covered by water is

a) 75%

b) 60%

c) 85%

d) 50%

#8. One of the following process is not involved in the water-cycle operating in nature.

a) Evaporation

b) Transpiration

c) Precipitation

d) Photosynthesis

#9. If there were no atmosphere around the Earth, the temperature of the Earth will

a) increase

b) go on decreaing

c) increase during day & decrease during night

d) be unaffected

#10. Nowadays which poses threat to our environment

a) greenhouse effect

b) global warming

c) ozone layer depletion

d) all of the above

#11. Which one of the following factors do not lead to soil formation in nature

a) the Sun

b) water

c) polythene bags

d) wind

#12. Biotic component of biosphere is not constituted by

a) producers

b) consumers

c) decompost

d) air

#13. Oxygen is returned to the atmosphere mainly by

a) burning of fossil fuel

b) respiration

c) photosynthesis

d) fungi

#14. The process of nitrogen-fixation by bacteria does not take place in the presence of

a) molecular form of hydrogen

b) elemental form of oxygen

c) water

d) elemental form of nitrogen

#15. What happens when rain falls on soil without vegetational cover?

a) rain water percolates in soil efficiently

b) rain water does not cause loss of surface soil

c) rain water does not cause any change in soil

d) rain water leads to fertility of the soil

#16. Top soil contains –

a) humus & living organisms only

b) humus & soil particles only

c) humus, living organisms & plants

d) humus, living organisms & soil particles

#17. Which is causing depletion of ozone layer

a) excessive deforestation

b) excessive use of man-made compounds containing both fluorine & chlorine

c) excessive formations of industrial units

d) excessive use of automobiles

#18. The nitrogen molecules present in air can be converted into nitrates & nitrites by

a) a biological process of nitrogen fixing bacteria present in soil.

b) a biological process of carbon fixing factors present in soil.

c) any of the industries manufacturing nitrogenous compounds.

d) the plants used as cereal crops in field.

#19. Which one of the following is not correct for the use of large amount of fertilizers & pesticides?

a) they are eco-friendly

b) they turn the fields barren after some time

c) they adversely affect the useful component from the soil

d) they destroy the soil fertility

#20. Oxygen is harmful for

a) ferns.

b) nitrogen-fixing bacteria.

c) Chara.

d) mango.

#21. Growth of Lichens on barren rocks is followed by the growth of

a) algae

b) ferns

c) gymnosperms

d) moss

#22. Low visibility during cold weather is due to

a) formation of fossil fuel

b) unburnt carbon particles or hydrocarbons suspended in air

c) lack of adequate power supply

d) None of these

#23. The atmosphere of the Earth is heated by radiations which are mainly

a) radiated by the sun

b) re-radiated by land

c) re-radiated by water

d) re-radiated by land & water

#24. When we breathe in air, nitrogen also goes inside along with oxygen. What is the fate of this nitrogen?

a) It moves along with oxygen into the cells.

b) It comes out with CO₂ during exhalation.

c) It is absorbed only by the nasal cells.

d) Nitrogen concentration is already more in the cells, so it is not at all absorbed.

#25. Which one of the following is not related to water-pollution?

a) the addition of undesirable substances to water

b) a change in temperature of the water bodies

c) a change in pressure of the water bodies

d) the removal of desirable substances from water bodies

#26. Rainfall patterns depend on

a) the underground water tables

b) the no. of water bodies in that area

c) the density pattern of human population in an area

d) the prevailing season in an area

#27. Soil erosion can be prevented by

a) deforestation

b) raising forests

c) excessive use of fertilizer

d) overgrazing by animals

#28. Which is not a greenhouse gas

a) Ammonia

b) Methane

c) Carbon monoxide

d) Carbon dioxide

#29. The two forms of oxygen found in the atmosphere are

a) water & ozone

b) water & oxygen

c) oxygen & ozone

d) water & carbon dioxide

#30. Which step is not involved in the carbon-cycle?

a) Photosynthesis

b) Transpiration

c) Respiration

d) Burning of fossil fuels

Finish

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To Be Continued