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Published on: 25/05/2021
QB365 Provides the updated NCERT Examplar Questions for Class 12 Biology, and also provide the detail solution for each and every ncert examplar questions , QB365 will give all kind of study materials will help to get more marks
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.
The breakdown of detritus into smaller particles by earthworm is a process called
humification
fragmentation
mineralisation
catabolism
2.
Both hydrarch and Xerarch successions lead to
medium water conditions
xeric conditions
highly dry conditions
excessive wet conditions
3.
During the process of ecological succession the changes that take place in communities are:
Orderly and sequential
Random
Very quick
Not influenced by the physical environment.
4.
Which one of the following is a symbiotic nitrogen fixer?
Azolla
Glomus
Azotobacter
Frankia
5.
Large woody vines are more commonly found in
temperate forests
mangrooves
tropical rainforests
alpine forests
6.
Of the total incident solar radiation the proportion of PAR is
about-70%
about 60%
less than 50%
more than 80%
7.
In ecological succession, the climax community is best recognised by the following state
P = R
P > R
P < R
\(P\neq R\)
8.
In an ecosystem, the cycling of nutrients is known as
geological cycle
chemical cycle
geochemical cycle
biogeochemical cycle
9.
Which of the ecological pyramid is always straight?
pyramid of numbers
pyramid of biomass
pyramid of energy
none of these
10.
Nutrient enrichment of a lake will cause
eutrophication
stratification
biomagnification
bioaccumulation
1.
(b)
fragmentation
2.
(a)
medium water conditions
3.
(a)
Orderly and sequential
4.
(d)
Frankia
5.
(c)
tropical rainforests
6.
(c)
less than 50%
7.
(a)
P = R
8.
(d)
biogeochemical cycle
9.
(c)
pyramid of energy
10.
(a)
eutrophication
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