Conservation of Plants and Animals Class 8 Science Free Notes and Mind Map (Free PDF Download)

conservation

Our planet’s plants and animals form the delicate web of life that sustains all living beings. From the oxygen we breathe to the food we eat, biodiversity provides essential resources for human survival. However, human activities like deforestation, urbanization, and pollution are threatening this balance at an alarming rate. Every year, we lose approximately 10 million hectares of forests – equivalent to 27 soccer fields every minute. Conservation of Plants and Animals is important for survival of humans.


1. Deforestation: Causes and Consequences

What is Deforestation?

The large-scale removal of forest cover primarily for:

  • Agricultural expansion
  • Urban development
  • Timber extraction
  • Mining operations

Major Causes of Deforestation

CauseExamplesImpact
AgricultureCattle ranching, palm oil plantations80% of deforestation globally
LoggingFurniture, paper productionLoss of 15 billion trees annually
UrbanizationRoads, housing projectsFragments wildlife habitats
MiningCoal, iron ore extractionPermanent ecosystem damage

Devastating Consequences

1. Climate Change

  • Trees absorb CO₂ (1 acre = 2.5 cars’ annual emissions)
  • Deforestation causes 15% of global greenhouse gases

2. Water Cycle Disruption

  • Reduces rainfall by up to 30%
  • Increases drought frequency

3. Soil Degradation

  • Topsoil loss of 24 billion tons/year
  • Leads to desertification

4. Biodiversity Loss

  • 137 species go extinct daily
  • 80% of land animals live in forests

5. Economic Impact

  • Loss of medicinal plants (25% drugs forest-derived)
  • Reduced timber and food resources

2. Conservation Strategies

Protected Areas Comparison

TypePurposeHuman ActivityExamples
Biosphere ReserveProtect biodiversity + local cultureLimitedPachmarhi (India)
National ParkPreserve ecosystemsRestrictedSatpura (India), Yellowstone (USA)
Wildlife SanctuaryProtect specific speciesSome permittedKaziranga (Rhinos), Periyar (Elephants)

Key Features:

  • Biosphere Reserves: Three zones (core, buffer, transition)
  • National Parks: Strict protection, no resource extraction
  • Sanctuaries: Focus on animal protection, some human activities allowed

3. Biodiversity Hotspots

Flora and Fauna of Pachmarhi Biosphere Reserve

CategorySpeciesSpecial Characteristics
FloraSal, Teak, Wild MangoEndemic to Central India
FaunaGiant Squirrel, Leopard, BarasinghaMany endangered species
BirdsHornbills, Migratory speciesWinter visitors from Siberia

Did You Know? The Giant Squirrel of Pachmarhi can grow up to 1 meter long!


4. Endangered Species Protection

Red Data Book Categories

StatusDefinitionIndian Examples
Critically EndangeredExtremely high extinction riskGreat Indian Bustard
EndangeredVery high risk in near futureBengal Tiger
VulnerableHigh risk in medium-termAsian Elephant

Conservation Success Stories:

  • Project Tiger (1973): Increased tiger numbers from 1,200 to 3,000+
  • Crocodile Conservation Project: Saved gharials from extinction

5. Solutions and Actions

Reforestation Methods

MethodProcessBenefits
Natural RegenerationLetting forests regrow naturallyLow-cost, high biodiversity
AfforestationPlanting new treesQuick results, controlled species
AgroforestryCombining crops with treesSustainable land use

Paper Recycling Process

  1. Collection of waste paper
  2. Pulping and cleaning
  3. Removal of inks/contaminants
  4. Sheet formation and drying

Impact:

  • Saves 17 trees per ton of paper
  • Uses 50% less energy than virgin paper
  • Reduces water pollution by 35%

6. Frequently Asked Questions

Q: Why can’t we just keep animals in zoos instead of sanctuaries?
A: Zoos have limited space and can’t maintain natural behaviors. Sanctuaries preserve entire ecosystems.

Q: How does migration help conservation?
A: Tracking migratory patterns helps identify critical habitats needing protection across borders.

Q: What can students do to help?
A: Simple actions matter:

  • Use recycled paper products
  • Participate in tree-planting drives
  • Reduce meat consumption (less land for cattle)

7. Summary

✔ Deforestation has cascading environmental impacts
✔ Protected areas follow different conservation approaches
✔ Endemic species require special protection efforts
✔ Every individual can contribute to solutions

Download Free Mind Map from the link below

This mind map contains all important topics of this chapter

[Download PDF Here]

Visit our Class 8 Science page for free mind maps of all Chapters


Exit mobile version