Biodiversity and Conservation

CBSE Class 12 Biology · every board question from this chapter, 2022–2026 · 37 of them repeated across years

• Select the correct option:2026
• Exploration of molecular, genetic and species level diversity for gaining products of economic importance is called2026
• What could be the reason of extinction of Abingdon Tortoise from Galapagos Islands?2026asked 2×
• If A= species richness and B= Endemism then biodiversity hotspots have2026
• Current percentage of tropical rainforests covering the Earth's land surface is2026
• Which of the following sacred groves is found in Meghalaya?2026asked 3×
• Connell's elegant field experiments on the rocky seacoast of Scotland, found that larger barnacles Balanus dominated the…2026asked 2×
• According to IUCN, some of the extinctions include: (i) Dodo (ii) Indian gazelle (iii) Thylacine (iv) Steller's Sea Cow Options:2026
• Which of the following fish led to the extinction of an ecologically unique assemblage of more than 200 species of cichlid fish…2026asked 2×
• Assertion: IUCN Red List helps in identifying and protecting endangered species worldwide. Reason (R): The list includes the…2026asked 2×
• Explain the type of interaction between: (i) Egret and Cattle (ii) Cuckoo and Crow OR Biodiversity exists at various levels…2026
• Biodiversity must be conserved as it plays an important role in many ecosystem services that nature provides. Explain any two…2026asked 3×
• (i) What is primary productivity of an ecosystem and how is it expressed? (ii) Explain the equation given below: NPP = GPP - R 1…2026
• There are many animals, which have become extinct in the wild, but continue to be maintained in zoological parks. Answer the…2026asked 3×
• Explain the level of biodiversity at genetic, species and ecological levels with the help of one example each.2026asked 3×
• Read the following passage and answer the questions that follow: India is one of the megadiverse countries housing around 8⋅1 per…2026asked 3×
• India has only 2.4% of the world's land area but its share of the global species diversity is:2025asked 3×
• Alien species are highly invasive and are a threat to indigenous species. Substantiate this statement with the help of any two…2025asked 3×
• The great German naturalist and geographer Alexander Von Humboldt observed that within a region species richness increased with…2025
• Indiscriminate human activities such as alien species invasion, fragmentation and habitat loss have accelerated the loss of…2025
• According to a recent wildlife report, the biggest threat to the tiger's survival in Mudumalai Tiger Reserve (MTR) was found to…2025asked 3×
• Who is having more species diversity - Columbia or Greenland and why? Explain the concept proposed by Paul Ehlrich.2025
• Explain how the loss of habitat and fragmentation drives plants and animals to extinction with the help of an example of habitat…2025asked 3×
• Study the pie chart given below, representing the global biodiversity and proportionate number of species of major taxa. Answer…2025
• Enlist one advantage and two disadvantages of green revolution.2025asked 3×
• (i) Describe the population growth curve applicable in a population of any species in nature that has unlimited resources at its…2025asked 3×
• Student to attempt either option or. (i) Explain giving three reasons why tropics show greatest levels of species diversity. (ii)…2025asked 3×
• (i) How does alien species invasion cause a decline in biodiversity? Explain. How have the following contributed to biodiversity…2025
• Assertion: "Biodiversity hotspots" are the regions which possess high levels of species richness, high degree of endemism. Reason…2024
• Assertion: Communities that comprise of more species tend to be more stable. Reason (R): A higher number of species results in…2024asked 2×
• Assertion: Loss of biodiversity can occur due to overexploitation of resources. Reason (R): Introduction of Clarias gariepinus in…2024asked 3×
• Biodiversity hotspots cover less than 2% of Earth's land area. Strict protection of these areas can reduce the rate of ongoing…2024asked 3×
• Given below is a pie chart representing global diversity of vertebrates. Redraw the pie chart identifying the groups 'A', 'B',…2024asked 3×
• Tropical regions harbour more species than the temperate regions. How have biologists tried to explain this in their own ways?…2024asked 3×
• Explain any three roles of 'predation' in an ecosystem with the help of suitable examples.2024
• The world is facing accelerated rates of species extinction largely due to human activities. Explain any three human activities…2024
• Predation is referred to as a detrimental interaction. Explain any three positive roles, supported by an example each, that a…2024asked 3×
• Read the following passage and answer the questions that follow. Isn't it incredible that India's land area is only 2 · 4 per…2024asked 3×
• Human settlement often leads to habitat loss which leads to fragmentation, forming smaller patches of habitats. Select the…2023asked 2×
• The IUCN Red Data List (2004) in the last 500 years documents the extinction of nearly 784 species including: 12023
• Which one among the following regions is not a hotspot of biodiversity?2023
• Which one of the following groups faces maximum threat of extinction? 12023
• The sixth extinction in progress currently is different from all previous extinctions on earth as it is:2023
• Mention the main objective of the Ramsar Convention. Name any two sites in India that are important in the Ramsar Convention.2023
• "Cattle and goats do not browse the Calotropis plant." Justify the statement giving reasons.2023
• "Abingdon tortoise in Galapagos islands became extinct within a decade on introduction of goats in the island." Explain giving…2023
• Illustrate with the help of an example how introduction of an alien species turns invasive and causes decline of an indigenous…2023
• India is the seventh largest country in the world in terms of total land area including land and water. Write the value of the…2023asked 2×
• On August 22 in the year 2022, 3358 fires were detected in the Amazon rainforests. Write one short-term and one long-term effect…2023
• "Biodiversity plays a major role in many ecosystem services that nature provides." Describe any two broadly utilatarian arguments…2023asked 3×
• Study the diagrammatic representation given below of the Earth with regions marked 'A' and 'B' respectively. Answer the questions…2023asked 3×
• Give your interpretation of the message given by ecologist Paul Ehrlich through his analogy "rivet popper hypothesis" to human…2022
• How are 'in-situ' and 'ex-situ' approaches of biodiversity conservations different from each other?2022
• The histogram given below representing the data for annual shark harvest in the great barrier reef / coral reef located on the…2022asked 3×
• Read the account of a natural large forest area that underwent many changes from the year 2002 to 2014 and answer the question…2022
• How are the advanced ex-situ techniques helping in conserving threatened species? Give three examples.2022
• The graph given below shows species-area relationship of a certain region. (i) Study the graph and explain what it represents.…2022asked 3×
• The data collected based on the survey conducted for species richness of group of mammals, in three different climatic regions of…2022
• Bio-diversification of life started to occur almost 3 billion years ago. Since then new species have been evolving and then…2022asked 3×
• What are the consequences of loss of biodiversity in a region? Explain.2022
• Explain giving reason the action plan followed by organic farmers that support their key belief "biodiversity furthers health of…2022asked 3×
• Given below is an equation describing the Species-Area relationship between species richness and area for a wide variety of taxa…2022asked 2×
• "Some species in an ecosystem exert greater influence in driving major ecosystem services than others." How did Paul Ehrlich…2022asked 3×
• Write the inference drawn by Alexander von Humboldt after his extensive explorations of South American jungle. Study the graph…2022asked 2×
• Explain the concept of "co-extinction" by taking two examples. OR "Forests provide intangible benefits to us." Explain by taking…2022asked 3×
• Enlist two criteria that are used to identify a region for maximum protection as 'Biodiversity hotspots'. Name any two "hotspot"…2022asked 3×
• Given below is a picture of a natural large habitat that is being continuously broken into smaller patches. This process is…2022asked 3×
• With the help of three examples, explain the 'broadly utilitarian' argument for conservation of biodiversity.2022
• "For ethical reasons, biodiversity must be conserved." Do you agree? Write your views in support of your answer. Write the…2022

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