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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.
31
In a food chain of grassland ecosystem the top consumers are
[1]
Herbivorous
[2]
Carnivorous
[3]
Bacteria
[4]
Either carnivorous or herbivorous
32
In which of the following form(s), the waster products are discharged into the biosphere?
[1]
Gaseous
[2]
Liquid
[3]
Solid
[4]
All of the above
33
Microbes that break down the complex organic matter into simple substances like carbon, nitrogen, water etc. are
[1]
Producers
[2]
Decomposers
[3]
Consumers
[4]
SymbiontsNone of these
34
MAB stands for
[1]
Man and biosphere
[2]
Man, antibiotics and bacteria
[3]
Man and biotic community
[4]
Mayer, Anderson and Bisby
Answer: Man and biosphere
35
The type of ecosystem with the highest mean plant productivity is
[1]
Tropical rain forest
[2]
Temperate grassland
[3]
Desert
[4]
Tundra
Answer: Tropical rain forest
36
Actively moving organism in aquatic ecosystem
[1]
Benthos
[2]
Phytoplankton
[3]
Zoo plankton
[4]
Nekton
37
Xeric environment is characterized by
[1]
High precipitation
[2]
Low atmospheric humidity
[3]
Extremes of temperatures
[4]
High rate of vaporization
Answer: Low atmospheric humidity
38
Ecosystem is smallest unit of
[1]
Ionosphere
[2]
Lithosphere
[3]
Biosphere
[4]
Mesosphere
39
The ecological pyramid which can be inverted in a tree eco-system is
[1]
Pyramid of Number
[2]
Pyramid of Energy
[3]
Pyramid of Biomass
[4]
both (b) and (c)
Answer: Pyramid of Number
40
Which of the following is primary consumer?
[1]
Producer
[2]
Carnivore
[3]
Top carnivore
[4]
Herbivore
41
Which of the following groups is absolutely essential functional component of the ecosystem?
[1]
Producers
[2]
Producers and herbivores
[3]
Producers and detritivores
[4]
Detritivores
Answer: Producers and detritivores
42
In an aquatic ecosystem, the trophic level equivalent to cows in grasslands is
[1]
Nekton
[2]
Zooplankton
[3]
Phytoplankton
[4]
Benthos
43
Species that occur in different geographical regions separated by special barrier
[1]
Allopatric
[2]
Sympatric
[3]
Sibling
[4]
None of the above
44
Deserts, grasslands, forests and tundra are the examples of
[1]
Biomes
[2]
Biogeographical regions
[3]
Ecosystems
[4]
Ecosystems
45
Biotic factors refer to
[1]
Gases produced by industries
[2]
Nutrient-deficient soils
[3]
Living organisms
[4]
Fossil fuel
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