Question

Taking the exaples of whole grain atta,fruit and green leafy vegetables,describe how roughage in our diet is useful.

Concise Biology Class IX By H.S. Vishnoi CHAPTER 12-NUTRITION

Answer 1

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• The cells of all plants have cell walls made of cellulose. It is not digested in our food canal as we have no cellulose digesting enzyme. The undigested cellulose being fibrous in nature, acts as roughage.

Role of roughage:

• Being fibrous, cellulose absorbs a lot of water and retains it, thus helps in keeping the rascal matter soft and prevents constipation.

• The movement of the undigested food becomes easier.

• It stimulates the muscle contraction in the intestinal wall, making the movement of faecal matter easy.

• It helps in the removal of cholesterol.

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