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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.
61
Which one of the following statements is correct for secondary succession?
[1]
It is similar to primary succession except that it has a relatively fast pace
[2]
It begins on a bare rock
[3]
It occurs on a deforested site
[4]
It follows primary succession
Answer: It occurs on a deforested site
62
An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will be having
[1]
High stability and high resilience
[2]
Low stability and low resilience
[3]
High stability and low resilience
[4]
Low stability and high resilience
Answer: Low stability and high resilience
63
Trophic levels in ecosystem is formed by :
[1]
only herbivores
[2]
only plants
[3]
only bacteria
[4]
Organisms linked in food chain
Answer: Organisms linked in food chain
64
"Complete competitors cannot coexist" is true for
[1]
Primary succession
[2]
Secondary succession
[3]
Competitive exclusion
[4]
Character displacement
Answer: Competitive exclusion
65
Terrestrial biomes has a rapid exchange of
[1]
Carbon dioxide
[2]
Oxygen
[3]
Water
[4]
All of the above
66
The rate of formation of new organic matter by rabbit in a grassland, is called
[1]
Net productivity
[2]
Net primary productivity
[3]
Secondary productivity
[4]
Gross primary productivity
Answer: Secondary productivity
67
Ecology deals with the study of:
[1]
Living beings
[2]
Living and non living components
[3]
Reciprocal relationship between living and non living
components
[4]
Environment
Answer: Reciprocal relationship between living and non living
components
68
Acacia arabica is
[1]
Hydrophyte
[2]
Mesophyte
[3]
Xerophyte
[4]
None of these
69
Of the total incident solar radiation the proportion of PAR is
[1]
More than 80%
[2]
About 70%
[3]
About 60%
[4]
Less than 50%
70
Total amount of living material at the various trophic levels of a food chain is depicted by pyramids of
[1]
Numbers
[2]
Energy
[3]
Biomass
[4]
All of these
71
The correct sequence of plants in a hydrosere is
[1]
Oak → Lantana → Volvox → Hydrilla → Pistia → Scirpus
[2]
Oak → Lantana → Scirpus → Pistia → Hydrilla → Volvox
[3]
Volvox → Hydrilla → Pistia → Scirpus → Lantana → Oak
[4]
Pistia → Volvox → Scirpus → Hydrilla → Oak → Lantana
Answer: Volvox → Hydrilla → Pistia → Scirpus → Lantana → Oak
72
The remains of the dead plants and animals is called
[1]
Detritus
[2]
Detritivores
[3]
Humus
[4]
Litter
73
Bell-shaped polygonal pyramid indicates
[1]
Low percentage of young individuals
[2]
Moderate percentage of young individuals
[3]
High percentage of young individuals
[4]
Low percentage of old individuals
Answer: Moderate percentage of young individuals
74
Autoecology deals with
[1]
Ecology of species
[2]
Ecology of many species
[3]
Ecology of community
[4]
All the above
Answer: Ecology of species
75
The age of pyramid with broad base indicates
[1]
High percentage of old individuals
[2]
Low percentage of young individuals
[3]
High percentage of young individuals
[4]
Low percentage of old individuals
Answer: High percentage of young individuals
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