Waec Biology 2002 Past Questions and Answers

Question 31:

• WAEC 2002

Using iodine solution, Biuret test, Benedict reagents and ethanol, respectively in testing for reducing
sugars, which of the following trends of colour changes would be observed?

A. Blue → black → blue → brown → clear
B. Brown → blue → brick red → clear
C. Brown → violet → blue → clear
D. Brown → blue → violet → milky

Question 32:

• WAEC 2002

Ecology simply means the study of

A. The properties of a habitat
B. Interrelationship between organisms and their environment
C. Several species of plants and animals
D. Interrelationship between plants and animals.

Question 33:

• WAEC 2002

Which of the following processes removes water from the water cycle?

A. Condensation
B. Perspiration
C. Photosynthesis
D. Transpiration

Question 34:

• WAEC 2002

The importance of practising crop-rotation in agriculture is to

A. Control soil erosion
B. Maintain the fertility of the soil
C. Improve the nutritional value of crops
D. Ensure growth of cash crops

Question 35:

• WAEC 2002

In any food chain, the first member must be a

A. Carnivore
B. Herbivore
C. Zooplankton
D. Autotroph