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Question

Describe various modes of nutrition. [3 MARKS]

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Solution

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The different modes of nutrition are

1. Autotrophic Nutrition: The term autotrophic ('self-feeding') defines organisms which are able to use external sources of energy in the synthesis of their organic food materials.
2. Heterotrophic Nutrition: Heterotrophic organisms obtain their energy by breaking down substances obtained from the bodies of other organisms. This mode can be of following types:

  • Holozoic nutrition: Some organisms take the food as a whole and break it inside the body. e.g. amoeba
  • Saprophytic nutrition: Some organisms (called saprophytes) use dead and decaying plants and animals as a source of their food. They break down the complex molecules outside their body and then absorb them in the body. eg. fungi.
  • Parasitic nutrition: Some organisms called parasites derive nutrients from plants and animals thereby affecting the host adversely. e.g. Cuscuta

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