CBSE Class 8 Science Question 21 of 26

Conservation of Plants and Animals — Question 21

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Question 6

In order to meet the ever-increasing demand in factories and for shelter, trees are being continually cut. Is it justified to cut trees for such projects? Discuss and prepare a brief report.

Answer

Below is a brief report on this topic:

The Justifiability of Tree Cutting for Industrial and Development Projects

Introduction

The ever increasing demand for raw materials, fuel, and land for industrial and development projects has led to widespread tree cutting. While economic progress and infrastructure development are crucial for societal growth, the justification of cutting trees for such projects requires careful consideration of environmental, social, and economic factors.

Environmental Impact

  1. Biodiversity Loss — Cutting of trees results in habitat destruction, leading to a decline in biodiversity as many species rely on forests for survival.
  2. Climate Change — Trees play a vital role in absorbing carbon dioxide. Cutting of trees contributes to increased greenhouse gas levels, leading to climate change.

Social Impact

  1. Displacement of Indigenous Communities — Tree cutting often displaces indigenous communities who depend on forests for their homes and livelihoods.
  2. Health Concerns — Deforestation can lead to air and water pollution, affecting the health of nearby communities.

Economic Impact

  1. Short-term Gains vs. Long-term Losses — While tree cutting may provide short-term economic benefits, the long-term impact on ecosystems, water resources, and climate stability can lead to economic challenges.

Sustainable Alternatives

  1. Reforestation — Implementing reforestation projects can help offset the environmental impact and promote sustainable resource management.
  2. Green Infrastructure — Incorporating eco-friendly practices and using alternative materials can reduce the need for extensive tree cutting.

Conclusion

While industrial and development projects are essential for progress, a balance must be struck to ensure sustainability. Implementing environmentally conscious practices, prioritizing reforestation efforts, and incorporating green infrastructure can mitigate the adverse effects of tree cutting. It is crucial for decision-makers to consider the long-term consequences and explore sustainable alternatives to achieve a harmonious coexistence between development and environmental conservation.

Chapter Overview: Conservation of Plants and Animals

This environmental chapter covers deforestation and its consequences, the importance of biodiversity, types of protected areas (biosphere reserves, national parks, wildlife sanctuaries), and concepts like endemic species, Red Data Book, and migration. Reforestation and paper recycling link conservation to everyday action.

Board Exam Weightage: 5-7 marks | Difficulty: Moderate

Key Formulas & Concepts

ConceptDetails
Biosphere ReserveLarge protected area: conservation + research + development (e.g., Pachmarhi, Sundarbans)
National ParkStrictly protected area: no human activity allowed (e.g., Jim Corbett, Kaziranga)
Wildlife SanctuaryAnimals protected, limited human activity like grazing allowed (e.g., Bharatpur, Periyar)
Red Data BookRecord of endangered species maintained by IUCN

Must-Know Concepts

  • Deforestation leads to soil erosion, desertification, floods, global warming, biodiversity loss
  • India is one of 12 mega-biodiversity countries
  • Endemic species are found only in a specific area; endangered species are at risk of extinction
  • Reforestation = replanting where forest existed; Afforestation = planting where forest never was
  • Siberian crane migrates from Siberia to Bharatpur (India) in winter
  • Recycling 1 tonne of paper saves about 17 trees

Protected Areas Comparison

FeatureBiosphere ReserveNational ParkWildlife Sanctuary
SizeLargestMediumSmallest
PurposeConservation + Research + DevelopmentStrict wildlife protectionAnimal protection in natural habitat
Human ActivityLimited (buffer zone)Not allowedLimited (grazing allowed)
ExamplePachmarhi (MP), NilgiriJim Corbett (UK), Gir (GJ)Bharatpur (RJ), Periyar (KL)

Common Mistakes to Avoid

  • Confusing biosphere reserve, national park, and wildlife sanctuary
  • Mixing up endemic (exclusive to area) and endangered (at risk of extinction)
  • Confusing reforestation (re-planting) and afforestation (new planting)
  • Thinking Red Data Book lists ALL species (only endangered ones)

Scoring Tips

  • Make a comparison table of protected areas with examples for each
  • Use memory aids: Endemic = Exclusive location; Endangered = at risk of Ending
  • Memorise 5 national parks and 5 wildlife sanctuaries with states
  • Practice drawing the cause-consequence chain of deforestation

Frequently Asked Questions

Q: How many marks does this chapter carry in the exam?
A: Approximately 5-7 marks in the annual exam.

Q: What question types are commonly asked?
A: MCQs (1 mark), Very Short Answer (2 marks), Short Answer (3 marks), and Long Answer / Diagram (5 marks).

Q: Is this chapter important for competitive exams?
A: Yes, concepts from this chapter appear in NTSE, Olympiad, and other science competitions.