MCQ Questions for Class 9 Science: Ch 14 Natural Resources

MCQ Questions for Class 9 Science: Ch 14 Natural Resources

1. When we breathe in air, nitrogen also goes inside along with oxygen. What is the fate of nitrogen?
(a) It moves along with oxygen into the cells
(b) It comes out with the carbon dioxide during exhalation
(c) It is absorbed only by the nasal cells
(d) Nitrogen concentration is already more in the cells, so itis not at all absorbed
► (b) It comes out with the carbon dioxide during exhalation

2. Out of the total land area, how many million hectares of land suffer from degradation?
(a) 150
(b) 175
(c) 200
(d) 225
► (b) 175

3. If there were no atmosphere around the earth, the temperature of the earth will
(a) increase
(b) go on decreasing
(c) increase during day and decrease during night
(d) be unaffected
► (c) increase during day and decrease during night

4. Approximately 70 percent of the earth is covered by water. Of this amount, approximately _____ percent of it is suitable for human use.
(a) 10
(b) 25
(c) 50
(d) less than one
► (d) less than one

5. Light bands of muscle fibre are made of the protein:
(a) Tubulin
(b) Myosin
(c) Actin
(d) Myoglobin
► (c) Actin

6. Carbon is incorporated into life-forms through:
(a) Combustion
(b) Photosynthesis
(c) Digestion
(d) Respiration
► (b) Photosynthesis

7. Ozone layer is getting depleted because of
(a) excessive use of automobiles
(b) excessive formation of industrial units
(c) excessive use of man-made compounds containing both fluorine and chlorine
(d) excessive deforestation
► (c) excessive use of man-made compounds containing both fluorine and chlorine

8. Lichens do not like to grow in cities because of :-
(a) SO2 pollution
(b) Missing natural habitat
(c) Absence of right type of algae and fungi
(d) Lack of moisture
► (a) SO2 pollution

9. In nitrogen cycle, which bacteria are responsible for nitrification?
(a) Rhizobium
(b) Nitrosomonas
(c) Nitrosomonas and Nitrobacter
(d) Clostridium
► (c) Nitrosomonas and Nitrobacter

10. Haversian system is typically found in bones of
(a) fishes
(b) aves
(c) reptiles
(d) mammals
► (d) mammals

11. mog is the mixture of
(a) smoke + CO2
(b) smoke + nitrogen
(c) smoke + fog
(d) smoke + ozone
► (c) smoke + fog

12. Which of the following tissue has matrix, that is the source of its structural and functional performances?
(a) connective tissue
(b) muscular tissue
(c) nervous tissue
(d) epithelial tissue
► (a) connective tissue

13. Which is not a function of humus?
(a) It allows water and air to penetrate deep underground.
(b) Humus greatly influences the soil structure of a region.
(c) Humus kills the harmful bacteria present in soil.
(d) Humus causes the soil to become more porous.
► (c) Humus kills the harmful bacteria present in soil.

14. Major protein of connective tissue is:
(a) Myosin
(b) Melanin
(c) Collagen
(d) Keratin
► (c) Collagen

15. Nitrogen-fixation by bacteria does not occur in the presence of:
(a) Oxygen
(b) Hydrogen
(c) Carbon dioxide
(d) Sulphur
► (a) Oxygen

16. Through which process is oxygen returned to the atmosphere?
(a) Combustion
(b) Photosynthesis
(c) Respiration
(d) Formation of nitrogen oxides
► (b) Photosynthesis

17. Breakdown of bigger rocks into fine smaller mineral particles is called:
(a) Paedogenesis
(b) Mineralization
(c) Cracking
(d) Weathering
► (d) Weathering

18. The greenhouse effect is due to :
(a) Impermeability of long wavelength radiations through CO2 of the atmosphere
(b) Penetrability of low wavelength raditions through O3 layer
(c) Penetrability of low wavelength radiations through CO2
(d) Impermeability of long wavelength radiations through O3 layer
► (a) Impermeability of long wavelength radiations through CO2 of the atmosphere

19. Which of the following mainly decides biodiversity in a particular area?
(a) Depth of bottom soil
(b) Different layers of soil
(c) Chemical composition of middle soil
(d) Quality of topsoil
► (d) Quality of topsoil

20. Carbon dioxide in atmospheric air amounts to be about :
(a) 0.003%
(b) 33%
(c) 0.03%
(d) 0.3%
► (c) 0.03%

21. In nutrient cycle, minerals tend to be dispersed through
(a) evaporation
(b) assimilation
(c) surface and sub-surface run off
(d) convection
► (c) surface and sub-surface run off

22. Which of the following does not cause water pollution?
(a) Addition of mercury salts to water body.
(b) Addition of disease-causing bacteria to water body.
(c) Addition of dissolved oxygen to water body.
(d) Addition of fertilizers to water body.
► (c) Addition of dissolved oxygen to water body.

23. Which of the following is a free living nitrogen fixing bacterium present in soil ?
(a) Azotobacter
(b) Nitrosomonas
(c) Rhizobium
(d) Pseudomonas
► (a) Azotobacter

23. Volkmann's canals occur in :-
(a) Cartilage
(b) Bone
(c) Internal ear
(d) Liver
► (b) Bone

24. The bone marrow is composed of :
(a) Muscle fibres and adipose tissue
(b) Areolar tissue and adipose tissue
(c) Adipose tissue and calcified cartilage
(d) Adipose tissue, areolar tissue and blood vessels
► (d) Adipose tissue, areolar tissue and blood vessels

25. Wrinkling in old age is due to
(a) collagen
(b) myosin
(c) keratin
(d) actin
► (a) collagen

26. Which of the following is not a "Greenhouse gas" ?
(a) SO2
(b) CO2
(c) N2O
(d) CH4
► (a) SO2

27. Fat is abundant in
(a) liver cells
(b) alveolar tissue
(c) lymph glands
(d) adipose tissue
► (d) adipose tissue

28. Which of the following gases contributes maximum to the 'Greenhouse effect' on earth ?
(a) Carbon dioxide
(b) Methane
(c) Chlorofluorocarbon
(d) Freon
► (a) Carbon dioxide

29. A logical sequence of carbon cycle is:
(a) Producer - Consumer - Decomposer
(b) Decomposer - Producer - Decomposer
(c) Consumer - Producer - Consumer
(d) Producer - Decomposer - Consumer
► (a) Producer - Consumer - Decomposer

30. Agroforestry and social forestry both includes
(a) Production forestry
(b) Commercial forestry
(c) Afforestation
(d) Plantation of trees
► (d) Plantation of trees

31. Bone marrow is important for
(a) breakdown of WBC
(b) production of RBC
(c) breakdown of RBC
(d) production of WBC
► (b) production of RBC

32. 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
► (b) elemental form of oxygen

33. The protein deposited in the dead superficial cells that make the skin epithelium impervious to water is
(a) keratin
(b) elastin
(c) collagen
(d) mucus
► (a) keratin

34. Foot and Mouth Disease is a highly contagious disease almost exclusive to cattle, sheep, swine, goats, and other cloven-hoofed animals. It is caused by
(a) fungi
(b) bacteria
(c) protozoa
(d) virus
► (d) virus

35. What happens when rain falls on soil without vegetational cover?
(a) Rain water percolates in soil efficiently
(b) Rain water causes loss of surface soil
(c) Rain water leads to fertility of the soil
(d) Rain water does not cause any change in soil
► (b) Rain water causes loss of surface soil

36. The longitudinal canals of the bone are called :
(a) Volkmann's canals
(b) Haversian canals
(c) Periosteum
(d) Endosteum
► (b) Haversian canals

37. A pollutant is any substance, chemical or other factor that changes natural :
(a) Geo-chemical cycle
(b) Flora of a place
(c) Balance of our environment
(d) Wild life of a region
► (c) Balance of our environment

38. Mammalian erythrocytes are
(a) circular
(b) biconcave
(c) non-nucleated
(d) all the above
► (d) all the above
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