Available Answers

1. 1.

   All living organisms require food. Mention four main purposes for which food is needed:

   1. ___________________________________________
   2. ___________________________________________
   3. ___________________________________________
   4. ___________________________________________
2. 2.

   Briefly explain Balanced diet.

3. 3.

   1. Which of the following is a rich source of protein?
      1. potato
      2. beans
      3. maize
      4. beetroot
      5. bread

   2. An enzyme is best defined as:

      1. a chemical messenger.
      2. chemical produced only in the alimentary canals of animals.
      3. a protein which speeds up the rate of biological reactions.
      4. any chemical which turns starch into reducing sugars.
4. 4.

   Name five constituents of food substances and give one rich source of each.

   Class of food	One rich source
   (a) _______________________	___________________
   (b) _______________________	___________________
   (c) _______________________	___________________
   (d) _______________________	___________________
   (e) _______________________	___________________

    

5. 5.

   State one general importance to the body of each of the following:

   1. mineral salts: _________________________________
   2. water: _______________________________________
   3. vitamins: ____________________________________
   4. roughage: ___________________________________
6. 6.

   Briefly explain 'soluble vitamins'.