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NCERT - Organisms and Populations Questions and Answers of Class 12 Biology | GkSeries

31 Individuals of a species which occur in a particular area constitute
1 Population
2 Fauna
3 Flora
4 Flora and Fauna

Answer: Population
32 CAM helps the plants in
1 Reproduction
2 Conserving water
3 Secondary growth
4 Disease resistance

Answer: Conserving water
33 Upper layer of water in a single body of water is known as
1 Hypolimnion
2 Epilimnion
3 thermocline
4 Hydroline

Answer: Epilimnion
34 The role of an organism in the ecological system is known as
1 Niche
2 Habitat
3 Herbivory
4 Interaction

Answer: Interaction
35 The abundance of a species population within its habitat is called
1 Relative density
2 Regional density
3 Absolute density
4 Niche density

Answer: Niche density
36 A terrestrial animal must be able to
1 Excrete large amounts of salts in urine
2 Actively pump salts out through the skin
3 Conserve water
4 Excrete large amount of water in urine

Answer: Conserve water
37 Information about birth rate, death rate, sex ratio, age distribution etc. of a population is obtained from
1 Mortality rate
2 Life table
3 Natality table
4 Both (1) and (3)

Answer: Life table
38 Which of the followings is not the characteristic of the anatomy of xerophytes?
1 Well developed conducting tissue
2 Spongy parenchyma
3 Thick cuticle
4 Well developed mechanical tissue

Answer: Spongy parenchyma
39 The lower limit of water availability is soil is known as
1 field capacity
2 Hypolimnion
3 thermocline
4 wilting point

Answer: wilting point

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