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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 Evolution of Biology.
(16)
Littoral zone is located along the
[1]
High mountains
[2]
Sea
[3]
Rivers
[4]
Desert
(17)
Gradual and predictable changes in the species composition of a given area is
[1]
Primary succession
[2]
Ecological succession
[3]
Xerarch succession
[4]
Secondary succession
Answer: Ecological succession
(18)
Trophic levels are formed by
[1]
Only plants
[2]
only animals
[3]
Only carnivorous
[4]
Organisms linked in food chain
Answer: Organisms linked in food chain
(19)
The Biosphere consists of the following
[1]
Lakes
[2]
Soils
[3]
Solid sediments
[4]
All of the above
(20)
Which one of the following correctly represents an organism and its ecological niche?
[1]
Vallisneria and pond
[2]
Desert locust (Schistocerca) and desert.
[3]
Plant lice (aphids) and leaf
[4]
Vultures and dense forestNone of these
Answer: Plant lice (aphids) and leaf
21
Biotic potential is counteracted by
[1]
Competition with other organisms
[2]
Producer is the largest
[3]
Limitation of food supply
[4]
None of the above
Answer: None of the above
22
About 70% of total global carbon is found in
[1]
Forests
[2]
Grasslands
[3]
Agroecosystems
[4]
Oceans
23
The term ‘Ecosystem’ was coined by
[1]
Odum
[2]
Clements
[3]
Arthur G. Tansley
[4]
Elton
24
The food chain, in which the microorganisms breakdown the energy-rich organic compounds prepared by the producers, is known as
[1]
Detritus food chain
[2]
Predator food chain
[3]
Parasitic food chain
[4]
Ecosystem
Answer: Detritus food chain
25
Definition of ecosystem is
[1]
The community of organisms together with the environment in which they live
[2]
The abiotic component of a habitat
[3]
The part of the earth and its atmosphere which inhibits living organisms
[4]
A community of organisms interacting with one another
Answer: The community of organisms together with the environment in which they live
26
In a lake, phytoplankton grow in abundance in
[1]
Littoral zone
[2]
Limnetic zone
[3]
Profundal zone
[4]
Benthic region
27
The maximum biomass occurs in
[1]
Tropical forests
[2]
Temperate forests
[3]
Taiga
[4]
Alpine vegetation
28
Mass of living matter at a trophic level in an area at any time is called
[1]
Standing state
[2]
Standing crop
[3]
Detritus
[4]
Humus
29
Animals living at the bottom of the sea are known as
[1]
Lentic
[2]
Pelagic
[3]
Benthic
[4]
Lotic
30
Identify the possible link "A" in the following food chain: Plant → insect → frog → "A" → Eagle
[1]
Cobra
[2]
Parrot
[3]
Rabbit
[4]
Wolf
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