Biodiversity and Conservation

86 CBSE Class 12 Biology past-year questions from 5 papers, 2022 to 2026, with answers and worked solutions.

Difficulty: 48 easy · 34 moderate · 4 hard.
Most-asked subtopics: Species Numbers and Patterns of Biodiversity (30), Loss of Biodiversity (28), Biodiversity Conservation (21).
Updated 8 October 2026.

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#1Species Numbers and Patterns of Biodiversity
#2Species Numbers and Patterns of Biodiversity
#3Species Numbers and Patterns of Biodiversity
#4Species Numbers and Patterns of Biodiversity
For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.
#5Species Numbers and Patterns of Biodiversity
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#6Species Numbers and Patterns of Biodiversity
#7Species Numbers and Patterns of Biodiversity
#8Species Numbers and Patterns of Biodiversity
#9Species Numbers and Patterns of Biodiversity
#10Species Numbers and Patterns of Biodiversity
#11Species Numbers and Patterns of Biodiversity
#12Species Numbers and Patterns of Biodiversity
#13Species Numbers and Patterns of Biodiversity
#14Species Numbers and Patterns of Biodiversity
#15Species Numbers and Patterns of Biodiversity
#16Species Numbers and Patterns of Biodiversity
#17Species Numbers and Patterns of Biodiversity
#18Species Numbers and Patterns of Biodiversity
#19Species Numbers and Patterns of Biodiversity
#20Species Numbers and Patterns of Biodiversity
#21Species Numbers and Patterns of Biodiversity
#22Species Numbers and Patterns of Biodiversity
Study the diagrammatic representation given below of the Earth with regions marked 'A' and 'B' respectively. Answer the questions that follow.
#23Species Numbers and Patterns of Biodiversity
Study the diagrammatic representation given below of the Earth with regions marked 'A' and 'B' respectively. Answer the questions that follow.
#24Species Numbers and Patterns of Biodiversity
Study the diagrammatic representation given below of the Earth with regions marked 'A' and 'B' respectively. Answer the questions that follow.
#25Species Numbers and Patterns of Biodiversity
#26Species Numbers and Patterns of Biodiversity
#27Species Numbers and Patterns of Biodiversity
Isn't it incredible that India's land area is only $2{\cdot}4$ per cent of the world's total land area whereas its share of the global species diversity is an impressive $8{\cdot}1$ per cent ! However, in these estimates of species, prokaryotes do not figure anywhere. Biologists are always keen on collecting data with respect to species diversity observed in different regions of the world. The data collected based on the survey conducted for species richness of groups of mammals in three different regions of the world is shown in the bar graph given below :
#28Species Numbers and Patterns of Biodiversity
Isn't it incredible that India's land area is only $2{\cdot}4$ per cent of the world's total land area whereas its share of the global species diversity is an impressive $8{\cdot}1$ per cent ! However, in these estimates of species, prokaryotes do not figure anywhere. Biologists are always keen on collecting data with respect to species diversity observed in different regions of the world. The data collected based on the survey conducted for species richness of groups of mammals in three different regions of the world is shown in the bar graph given below :
#29Species Numbers and Patterns of Biodiversity
Isn't it incredible that India's land area is only $2{\cdot}4$ per cent of the world's total land area whereas its share of the global species diversity is an impressive $8{\cdot}1$ per cent ! However, in these estimates of species, prokaryotes do not figure anywhere. Biologists are always keen on collecting data with respect to species diversity observed in different regions of the world. The data collected based on the survey conducted for species richness of groups of mammals in three different regions of the world is shown in the bar graph given below :
#30Species Numbers and Patterns of Biodiversity
Isn't it incredible that India's land area is only $2{\cdot}4$ per cent of the world's total land area whereas its share of the global species diversity is an impressive $8{\cdot}1$ per cent ! However, in these estimates of species, prokaryotes do not figure anywhere. Biologists are always keen on collecting data with respect to species diversity observed in different regions of the world. The data collected based on the survey conducted for species richness of groups of mammals in three different regions of the world is shown in the bar graph given below :
#31Importance of Species Diversity
#32Importance of Species Diversity
#33Importance of Species Diversity
#34Importance of Species Diversity
Question number 13 to 16 consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below :
#35Importance of Species Diversity
#36Importance of Species Diversity
#37Importance of Species Diversity
#38Loss of Biodiversity
#39Loss of Biodiversity
#40Loss of Biodiversity
#41Loss of Biodiversity
#42Loss of Biodiversity
#43Loss of Biodiversity
#44Loss of Biodiversity
#45Loss of Biodiversity
#46Loss of Biodiversity
#47Loss of Biodiversity
In 2021, $5{\cdot}3$ percent of 15 to 16-year-olds worldwide ( $13{\cdot}5$ million individuals) had used Cannabis in the past year according to UNODC. The adolescent brain is still developing and drug use can have long-term negative effects. Early drug use initiation can lead to faster development of dependence than in adults and other problems in adulthood. Parts of the Amazon Basin are at the intersection of multiple forms of organised crimes that are accelerating devastation, with severe implications for the security, health and well-being of the population across the region. The direct impact of coca cultivation on deforestation is minimal, but indirectly it acts as a catalyst for "Narco-deforestation". The laundering of drug trafficking profits into land speculation etc. is posing a growing danger to the world's largest rainforest.
#48Loss of Biodiversity
#49Loss of Biodiversity
#50Loss of Biodiversity

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