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Free Download as PDF of the detailed solutions for class 12 Biology from NCERT or CBSE text book as per exam pattern, to help you in day to day learning. We provide all important questions and answers from chapter Organisms and Populations of Biology.
31
Individuals of a species which occur in a particular area constitute
[1]
Population
[2]
Fauna
[3]
Flora
[4]
Flora and Fauna
32
CAM helps the plants in
[1]
Reproduction
[2]
Conserving water
[3]
Secondary growth
[4]
Disease resistance
33
Upper layer of water in a single body of water is known as
[1]
Hypolimnion
[2]
Epilimnion
[3]
thermocline
[4]
Hydroline
34
The role of an organism in the ecological system is known as
[1]
Niche
[2]
Habitat
[3]
Herbivory
[4]
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
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
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)
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
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