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