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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.
46
Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem?
[1]
Frog
[2]
Phytoplankton
[3]
Fish
[4]
Zooplankton
47
The set of ecosystems is called a
[1]
Biome
[2]
Climate
[3]
Subsystem
[4]
Structure
48
Which one of the following is commonly found in temperate coniferous forest?
[1]
Quercus
[2]
Dipterocarpus
[3]
Shorea robusta
[4]
Pinus wallichiana
Answer: Pinus wallichiana
49
The tiny free-swimming animals on the surface of water constitute
[1]
Phytoplankton
[2]
Symbionts
[3]
Benthos
[4]
Zooplankton
50
Which of the following ecosystems has highest rate of gross primary production?
[1]
Grasslands
[2]
Mangroves
[3]
Coral reefs
[4]
Equatorial rain forests
Answer: Equatorial rain forests
51
The final stable community in ecological succession is
[1]
Climax
[2]
Sere
[3]
Pioneers
[4]
Carnivores
52
The following is an example of Terrestrial Biome
[1]
Rivers
[2]
Streams
[3]
Tropical rain forest
[4]
All of the above
Answer: Tropical rain forest
53
The biomass available for consumption by the herbivores and the decomposers is called
[1]
Gross primary productivity
[2]
Net primary productivity
[3]
Secondary productivity
[4]
Standing crop
Answer: Net primary productivity
54
Plant species having a wide range of genetical distribution evolve into a local population known as
[1]
Ecotype
[2]
Biome
[3]
Ecosystem
[4]
Population
55
In an ecosystem, the main source of energy is
[1]
heat released during transpiration
[2]
solar energy
[3]
sugar stored in plants
[4]
heat released during fermentation
56
Transfer of energy in different trophic levels of an ecosystem is called
[1]
Bioenergetics
[2]
Biosystem
[3]
Geobiocoenosis
[4]
Holocoenotic
57
Which of the following is expected to have the highest value (gm/m2/yr) in a grassland ecosystem?
[1]
Tertiary production
[2]
Gross production (GP)
[3]
Net production (NP)
[4]
Secondary production
Answer: Gross production (GP)
58
When the two ecosystems overlap each other, the area is called
[1]
Habitat
[2]
Niche
[3]
Ecotone
[4]
Ecotype
59
The 10% law for energy transfer in food chains was given by
[1]
Stanley
[2]
Tranley
[3]
Lindemann
[4]
Weismann
60
The 10% law for energy transfer in food chains was given by
[1]
Stanley
[2]
Tranley
[3]
Lindemann
[4]
Weismann
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