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Published on: 28/05/2021
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Download CBSE Class 12th Standard CBSE Biology question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Biology
Questions + Answers key
Take MCQ Biology Test1.
Total number of identified biodiversity hotspots in the world is
25
24
40
34
2.
Xenograft means
A graft between two genetically identical individuals
A graft in which a tissue is grafted from one individual to another individuals of the same species
A graft between individuals of different species
Tissue grafted from one area to another of the same individual
3.
A connecting link between reptiles and birds is
Dimetrodon
Dodo
Archaeopteryx
Sphenodon
4.
Evolutionary history of an organism is known as
ontogeny
phylogeny
ancestry
paleontology
5.
Which one of the following areas in India, is a hotspot of biodiversity
Eastern Ghats
Gangetic plain
Sunderbans
Western ghats
6.
Biodiversity of a geographical region represents
endangered species found in the region
the diversity of the organisms living in the region
genetic diversity in the dominant species of the region
species endemic to the region
7.
The biogenetic law of Hackel is
Omnis vivum-e-vivum
Omnis cellula-e-cellula
Ontogeny repeats phylogeny
Phylogeny repeats ontogeny
8.
Hotspots of biodiversity means
area of the earth that contains many endemic species
species servers as a proxy for entire communities in particular area
species in particular niche/area
species diversity at particular area
9.
Which one of the following is not observed in biodiversity hotspots?
lesser inter-specific competition
species richness
endemism
accelerated species loss
10.
Alzheimer disease in humans is associated with the deficiency of
Gamma-aminobutyric acid (GABA)
Dopamine
Glutamic acid
Acetylcholine
11.
A person likely to develop tetanus is immunised by administering:
Weakened germs
Dead germs
Preformed antibodies
Wide spectrum antibodies
12.
The amount of fresh water of the earth frozen as polar or glacial ice is
0.5%
0.02%
0.01%
1.97%
2.5%
13.
At the time of shedding, the number of nuclei present in an angiosperm pollen grain is
one
one or two
two or three
only two
14.
Residual persistent nucellus is known as
perisperm
pericarp
integuments
none of these
15.
A health disorder that results from the deficiency of thyroxine in adults and characterized by (i) a low metabolic rate (ii) increase in body weight and (iii) tendency to retain water in tissue is:
Cretinism
Hypothyroidism
Simple goitre
Myxoedema
1.
(d)
34
2.
(c)
A graft between individuals of different species
3.
(c)
Archaeopteryx
4.
(b)
phylogeny
5.
(d)
Western ghats
6.
(b)
the diversity of the organisms living in the region
7.
(c)
Ontogeny repeats phylogeny
8.
(a)
area of the earth that contains many endemic species
9.
(a)
lesser inter-specific competition
10.
(d)
Acetylcholine
11.
(c)
Preformed antibodies
12.
(d)
1.97%
13.
(c)
two or three
14.
(a)
perisperm
15.
(d)
Myxoedema
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