Waec Biology 2012 Past Questions and Answers

Question 31:

• WAEC 2012

The purpose of proteins in the diet of a mammal is to

A. Promote growth and repair cells
B. Break down molecules
C. Regulate the flow of chyme
D. Serve as co-factors or enzymes

Question 32:

• WAEC 2012

Excess carbohydrates can be stored in the muscles in the form

A. Cellulose
B. Glycogen
C. Chitin
D. Lipids

Question 33:

• WAEC 2012

The bones of the legs of a six years old boy are observed to be weak and crooked. Which of the following elements
were deficient in his mother’s diet at pregnancy?

A. Sodium and iron
B. Iron and manganese
C. Calcium and phosphorus
D. Magnesium and sulphur

Question 34:

• WAEC 2012

The diagram above is an illustration of an experimental setup to test the action of
yeast. What test would be used to confirm the nature of the gas given off at?

A. Insert a glowing splint
B. Pass the gas through lime water
C. Insert a piece of litmus paper
D. Smell the gas

Question 35:

• WAEC 2012

Which of the following digestive enzymes would be greatly affected if the liver fails to
produce bile?

A. Amylase
B. Cellulase
C. Lipase
D. Rotease