CBSE 7th class science lesson 2
This chapter explains how animals, including humans, obtain and digest food.
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Different Modes of Feeding – Animals show different feeding habits: herbivores, carnivores, omnivores.
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Steps in Nutrition in Humans:
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Ingestion – Taking in food
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Digestion – Breaking down food
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Absorption – Nutrients enter blood
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Assimilation – Use of nutrients by body
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Egestion – Removal of waste
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Human Digestive System:
Includes mouth, oesophagus, stomach, small intestine, large intestine, rectum, and anus. Each part has a specific function in digestion.
Role of Enzymes: Enzymes help in breaking down food into simpler substances.
Animals have different ways of obtaining and digesting food, but all follow basic steps like ingestion, digestion, absorption, and egestion.
