Food chain YouTube Lecture Handouts

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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

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Steps of Food Chains

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Trophic Levels

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Types of Food Chain

• Grazing food chain

• Detritus food chain

• Parasitic food chain

Food Web

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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

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Pyramid of Number

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Pyramid of Biomass

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Pyramid of Energy

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Disadvantages of Ecological Pyramids

• Only indicates food chain

• Decomposers ?

• Single Organisms different trophic levels ?

-Manishika