Biology (Dietary Fibre/Roughage)

Question 1

Sources of roughage

Answer 1

Cereals
Wholemeal bread
Fruits
Vegetables

Question 2

Functions of roughage

Answer 2

Stimulates peristalsis, help in moving faeces along large intestines

Absorb water, making faeces softer, thus help in preventing constipation

Question 3

Features of roughage

Answer 3

-consists of cellulose and lignin
-cannot be digested by the human body