Waec Biology 1990 Past Questions and Answers

Question 46:

• WAEC 1990

Changes in energy flow between organisms in a habitat can be represented by a

A. Pyramid of biomass
B. Pyramid of numbers
C. Pyramid of energy
D. Food chain
E. Food web

Question 47:

• WAEC 1990

Which of the following processes is not involved in the carbon cycle?

A. Burning
B. Decay
C. Transpiration
D. Respiration
E. Photosynthesis

Question 48:

• WAEC 1990

Which of the following processes are involved in a water cycle?

A. Evaporation, condensation and precipitation
B. Evaporation, percolation and transpiration
C. Evaporation and precipitation
D. Evaporation and transpiration
E. Precipitation and condensation.

Question 49:

• WAEC 1990

Water in the human body is derived from the following sources except through

A. Drinking water
B. Food substances
C. Cytoplasm of worn-out cells
D. Respiratory activity
E. Absorption by the skin

Question 50:

• WAEC 1990

The conservation of natural resources can be achieved by the following except

A. Creation of national parks
B. Formation of conservation societies and agencies
C. Establishment of game reserves
D. Deregulated harvesting
E. Making laws on conservation