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Diversity for Sustenance

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Biosphere

  • Biosphere is the part of the earth where life exists.
  • It extends to soil, atmosphere and water.
  • Abiotic factors are essential for the existence of the living world.

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Activity 1

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  • Sun is the primary source of energy in the living world.
  • Green plants convert light energy to chemical energy.
  • This energy gets transferred to other organisms through food chain.
  • Plants that perform photosynthesis are called Producers while organisms that depend on plants directly or indirectly are called Consumers.

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Organisms that depend directly on plants are called Primary producers.

Organisms that feed on primary consumers are Secondary consumers.

Organisms that feed on Secondary consumers are Tertiary consumers.

Ecology is the study of interaction between organisms and also between the organisms and their surroundings.

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Activity 2

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Asked the students to observe the food web and answer the questions.

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  • How do food chain and food web differ from each other?
  • Is a single organism involved in morethan one food chain?
  • Is the possibility of an organism becoming food to more then one organism helpfulto the existence of the food chain? Why?

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Consolidation

  • Food chain is a chain of organisms that transfer energy through food chains.
  • Food web consists of many interconnected food chains.
  • A single organism is involved in in more than one food chain.
  • The possibility of an organism becoming food to more than one organism is helpful to regulate the number of organisms from exceeding a certain level.

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Review Questions

  1. What is the difference between food chain and food web?
  2. What is ecology?
  3. How are abiotic factors useful to biotic factors?

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Follow Up Activity

Draw a food web connecting different food chains in your science diary.