The helps in the movement of waste materials in the alimentary canal.

roughage

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proteins

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fats

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carbohydrates

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Solution

The correct option is A roughage
We eat plant materials which contains cellulose. It cannot be digested in our alimentary canal as we do not have cellulose digesting enzymes. This undigested cellulose being fibrous in nature acts as roughage. It enables waste material in our alimentary canal move easily.

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The exit of waste materials from the human alimentary canal is regulated by:

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