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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)
Biogas is a mixture of
[1]
40 % methane and 60% CO2
[2]
40 % methane and 60% ethane
[3]
40 % CO2 and 60% methane
[4]
60% methane and 40% CO2
Answer: 60% methane and 40% CO2
(17)
Lime is added to the soil which is too
[1]
Sandy
[2]
Salty
[3]
Alkaline
[4]
Acidic
(18)
Which one of the following has maximum genetic diversity in India?
[1]
Tea
[2]
Teak
[3]
Mango
[4]
Wheat
(19)
Which group of vertebrates comprises the highest number of endangered
species?
[1]
Mammals
[2]
Fishes
[3]
Reptiles
[4]
Birds
(20)
Which one of the following is not included under in situ conservation?
[1]
National Park
[2]
Botanic Garden
[3]
Statuary
[4]
Biosphere reserve
21
The key objective of convention at Rio de Janeiro of Earth Summit in 1992
[1]
Conservation of biological diversity
[2]
Sustainable use of biodiversity
[3]
Fair and equitable sharing of benefits arising out of the utilization of genetic resources
[4]
all of these
22
The international organization IUCN is abbreviation of
[1]
Internal Union Council for Natural gas
[2]
International Union Council for Nature
[3]
International Union for Conservation of Nature
[4]
Internal United Council of Nations
Answer: International Union for Conservation of Nature
23
Which one of the following expanded forms of the followings acronyms is correct?
[1]
IUCN = International Union for Conservation of Nature and Natural Resources
[2]
IPCC = International Panel for Climate Change
[3]
UNEP = United Nations Environmental Policy
[4]
EPA = Environmental Pollution Agency
Answer: IUCN = International Union for Conservation of Nature and Natural Resources
24
Which one of the following areas in India, is a hotspot of biodiversity?
[1]
Sunderbans
[2]
Western Ghats
[3]
Eastern Ghats
[4]
Gangetic Plain
25
Which one of the following is not used for ex situ plant conservation?
[1]
Field gene banks
[2]
Seed banks
[3]
Shifting cultivation
[4]
Botanical Gardens
Answer: Shifting cultivation
26
The major causes of extinction of different species includes
[1]
habitat loss and over-hunting
[2]
climate change and pollution
[3]
deforestation
[4]
all of above
27
Plants like Aegle marmelos, Ocimum sanctum and Ficus religiosa are a group of plants designated as
[1]
Traditional food crops
[2]
Sacred species of plants
[3]
Medicinal plant species
[4]
Lesser known food plants
Answer: Sacred species of plants
28
Darwin’s finches are a good example of
[1]
Convergent evolution
[2]
Industrial melanism
[3]
Connecting link
[4]
Adaptive radiation
Answer: Adaptive radiation
29
The least porous soil among the following is a
[1]
Loamy soil
[2]
Silty soil
[3]
Clayey soil
[4]
Peaty soil
30
Prolonged liberal irrigation of agricultural fields is likely to create the problem of
[1]
Aridity
[2]
Metal toxicity
[3]
Salinity
[4]
Acidity
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