Food Chain YouTube Lecture Handouts

Doorsteptutor material for competitive exams is prepared by world's top subject experts: get questions, notes, tests, video lectures and more- for all subjects of your exam.

Get video tutorial on: Examrace YouTube Channel

4 Concepts & Exceptions in Ecosystem - Food Chain, Food Web, Pyramids, Biomagnification

Food Chain Food Web Ecological Pyramids

Contents

  • Food chain
  • Trophic levels
  • Types of food chains
  • Food web
  • Significance of food web
  • Ecological pyramids
  • Disadvantages of ecological pyramids

Food Chain

Illustration: Food Chain

Steps of Food Chains

Illustration: Steps of Food Chains

Trophic Levels

Illustration: Trophic Levels

Types of Food Chain

  • Grazing food chain
  • Detritus food chain
  • Parasitic food chain

Food Web

Illustration: Food Web

Significance of Food Web

  • Maintain the ecological balance
  • Feeding relations among organisms
  • Energy flow and nutrient cycling
  • Alternate source of food

Ecological Pyramids

  • Pyramid of Number
  • Pyramid of Biomass
  • Pyramid of Energy

Pyramid of Number

Illustration: Pyramid of Number

Pyramid of Number

Illustration: Pyramid of Number

Pyramid of Biomass

Illustration: Pyramid of Biomass

Pyramid of Energy

Illustration: Pyramid of Energy

Disadvantages of Ecological Pyramids

  • Only indicates food chain
  • Decomposers?
  • Single Organisms different trophic levels?

Manishika