Biodiversity & Conservation: Class 12 Previous Year Questions

Biodiversity & Conservation questions asked in CBSE board exams

Repeated questions first. Open the free app to see each question as it appeared in the paper, with its marking scheme.

1. Select the mismatched pair : 1 (A) Mega diversity countries in the world – 12 (B) Genetically different strains of rice in India – Less than 1000 (C) Robert Mays estimation on global species diversity – 7 million species worldwide (D) Zoological parks – Ex-sit…
   Board 20261 markMCQ
2. Which of the following sacred groves is found in Meghalaya ? 1 (A) Jaintia hills (B) Bastar (C) Chanda (D) Sarguja
   Board 20261 markMCQ
3. Select the correct option : 1 (A) Tropics between –– Higher biodiversity 23.5° N – 23.5° S than temperate areas (B) Columbia –– 105 bird species (C) New York –– 1400 bird species (D) India –– 2000 bird species
   Board 20261 markMCQ
4. Assertion (A) : IUCN Red List helps in identifying and protecting endangered species worldwide. 1 Reason (R) : The list includes the species facing risk of extinction.
   Board 20261 markAssertion-Reason
5. Student to attempt either option (A) or (B). (A) (i) Explain giving three reasons why tropics show greatest levels of species diversity. (i) Draw a graph showing species-area relationship. Name the naturalist who studied such relationship. Write the observatio…
   Board 20255 markslong answer
6. (a) Indiscriminate human activities such as alien species invasion, fragmentation and habitat loss have accelerated the loss of biodiversity. Justify by taking one example for each. (b) State the importance of the following : (i) IUCN Red data list (i) Hot spo…
   Board 20253 marksshort answer
7. Assertion (A) : Loss of biodiversity can occur due to overexploitation of resources. Reason (R) : Introduction of Clarias gariepinus in Indian rivers has led to a decline in native Indian fishes.
   Board 20241 markAssertion-Reason
8. The histogram given below representing the data for annual shark harvest in the great barrier reef / coral reef located on the east coast of Queensland, Australia. Study the histogram and answer the questions that follow. 1200 Catch (tonnes) 1000 800 - 600 - 4…
   Board 20221 markvery short
9. Bio-diversification of life started to occur almost 3 billion years ago. Since then new species have been evolving and then disappearing en masse from earth. (a) How many episodes of mass extinctions of species have already taken place and which one is in prog…
   Board 20221 markvery short
10. Enumerate the main sources of bio-fertilisers giving one example of each. () 12· () (yaRUT 3STRa) BB zr /% h 80 NA Bt H Bt-H ll. Explain giving reason the action plan followed by organic farmers that support their key belief ·biodiversity furthers health of cr…
    Board 20221 markvery short
11. *There is no change in the Question Paper Design and Assessment Pattern for Academic Session 2026-27. 33 Attempt either option A or B. A. A Green Valley X, home to rare medicinal plants and several migratory bird species, is facing multiple environmental chall…
    Sample paper 2026-275 markscase-based
12. Diversity is seen in the living world at various levels. The distribution of biodiversity shows specific patterns that account for the species richness or paucity across the globe. (a) Explain, with reasons, how species diversity changes with changing latitude…
    CBSE practice 2021-223 marksshort answer
13. Latitudinal gradients have an impact on species diversity. While species diversity is highest at the tropics and lowest at the poles, loss of biodiversity also is highest in the tropics and lowest at the poles. (a) Mention ONE possible reason for the low speci…
    CBSE practice 2022-233 marksshort answer
14. In a study comparing two continents - Antarctica and Asia, the species-area relationship was investigated using the following data: Parameter Antarctica Asia Area 14 x 106 km2 44 x 106 km2 Regression coefficient 1 1 Y-intercept 5 10 3 (a) Calculate the species…
    CBSE practice 2023-243 marksshort answer
15. Which bio conservation strategy is used when the endangered species are removed from the unsafe or threatened habitat and placed under human care? How is this strategy different from the other strategy of bio-conservation?
    CBSE practice 2023-243 marksshort answer
16. Eicchornia crassipes (commonly known as water hyacinth) is an aquatic plant, native to the Amazon basin. It was introduced to the water bodies of India and other South- East Asian countries for industrial use of its fibres in making bags and footwear, as a sub…
    CBSE practice 2021-222 marksshort answer

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