Environmental Issues Quiz - CBSE Class 12 Biology

Free practice quiz: Environmental Issues (CBSE Class 12 Biology). 12 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which of the following is NOT a major environmental issue discussed in the NCERT?

   1. Ozone layer depletion
   2. Climate change
   3. Deforestation
   4. Increased pet ownership
   Show answer

   Answer: D. Increased pet ownership

   While pet ownership has environmental impacts, it's not a major environmental issue covered extensively in the NCERT 12th Biology Ecology chapter on Environmental Issues compared to ozone depletion, climate change, and deforestation.

2. What is the main cause of ozone layer depletion?

   1. Carbon dioxide emissions
   2. Deforestation
   3. Chlorofluorocarbons (CFCs)
   4. Increased volcanic activity
   Show answer

   Answer: C. Chlorofluorocarbons (CFCs)

   CFCs, used in refrigerants and aerosols, break down ozone molecules in the stratosphere, leading to ozone layer depletion.

3. Explain the concept of eutrophication and its consequences.

   1. Decrease in nutrient levels in water bodies
   2. Increase in oxygen levels in water bodies
   3. Increase in nutrient levels leading to algal blooms and oxygen depletion
   4. No impact on water quality
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   Answer: C. Increase in nutrient levels leading to algal blooms and oxygen depletion

   Eutrophication is the enrichment of water bodies with nutrients, leading to excessive algal growth (algal blooms), which depletes oxygen and harms aquatic life.

4. Analyze the impact of climate change on biodiversity loss.

   1. Climate change has no impact on biodiversity
   2. Climate change enhances biodiversity
   3. Climate change leads to habitat loss and species extinction
   4. Climate change increases the carrying capacity of ecosystems
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   Answer: C. Climate change leads to habitat loss and species extinction

   Climate change alters habitats, disrupts ecological processes, and increases the risk of extinction for many species, leading to significant biodiversity loss.

5. Critically analyze the role of human activities in exacerbating environmental issues and propose potential solutions based on sustainable development principles.

   1. Human activities have a negligible impact
   2. Sustainable development is not a viable solution
   3. Human activities are the primary driver, and solutions require systemic changes and global cooperation
   4. Technological advancements alone can solve environmental problems
   Show answer

   Answer: C. Human activities are the primary driver, and solutions require systemic changes and global cooperation

   Human activities are the main drivers of most environmental issues. Addressing them effectively requires comprehensive systemic changes and international collaboration based on sustainable development principles.

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