NCERT Class 12 Biology Question bank and Answers

NCERT Class 12 Biology Question bank and Answers NCERT Class 12 Biology QUESTIONS

NCERT Class 12 Biology Question bank and Answers

101 Niche overlap indicates
A mutualism between two species
B active cooperation between two species
C sharing of one or more resources between the two species
D two different parasites on the same host.

Answer: sharing of one or more resources between the two species
102 The formula of exponential population growth curve, is
A dN/dt = rN
B rN/dN = dt
C dt/dN rN
D dN/rN = dt

Answer: dN/dt = rN
103 Individuals of one kind, i.e., one species occupying a particular geographic area, at a given time form a/an
A population
B deme
C community
D biome

Answer: population
104 The last stable community in succession that is in equilibrium with the environment, is called
A climax community
B pioneer community
C serai community
D None of these

Answer: climax community
105 Good ozone is found in the
A ionosphere.
B stratosphere
C troposphere
D mesosphere

Answer: stratosphere
106 Cyanobacteria are used as biofertilisers because they
A are photosynthetic
B grow easily anywhere
C have mucilage
D fix atmospheric nitrogen

Answer: fix atmospheric nitrogen
107 Methanogens, growing anaerobically on cellulosic material, produce
A methane, carbon dioxide, hydrogen.
B methane and hydrogen
C methane and carbon dioxide
D methane gas

Answer: methane, carbon dioxide, hydrogen.
108 The residue left after methane production from cattle dung is
A used as manure
B used in civil construction.
C burnt
D burned in land fills

Answer: used as manure
109 The vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria is
A vitamin B12
B vitamin E.
C vitamin C
D vitamin D

Answer: vitamin B12
110 Darwin judged the fitness of individuals by
A dominance over other individuals.
B number of offspring produced.
C ability to defend itself.
D strategy to obtain food.

Answer: number of offspring produced.

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