Waec Biology 2006 Past Questions and Answers

Question 46:

• WAEC 2006

Which of these diseases cannot be spread by an insect?

A. Cholera
B. Malaria
C. Trypanosomiasis
D. Measles

Question 47:

• WAEC 2006

Air pollution can be reduced by the following methods except

A. Building tall factory chimneys
B. Passing waste gases through filters and absorbers
C. Using lead-free petrol in car
D. Recycling tins, cans and bottles

Question 48:

• WAEC 2006

An effective management of natural resources to ensure their continued yield from generation to generation may involve all the following except

A. Protection of wildlife
B. Prevention of habitat destruction
C. Biological control of pests
D. Disposal of raw sewage into the sea

Question 49:

• WAEC 2006

Which of the following orders correctly represents the trend in eutrophication?

A. Lack of oxygen → Death of aquatic organisms → Massive algal growth
B. Excess nitrates and phosphates → Massive algal growth → Lack of oxygen → Death of aquatic organisms
C. Heavy mineralization → Lack of oxygen → Massive algal growth
D. Excess nitrates and phosphates → Lack of oxygen → Massive algal growth → Death of aquatic organisms

Question 50:

• WAEC 2006

The following practices can contribute towards the conservation of natural resources except

A. Afforestation
B. Deforestation
C. Contour ploughing
D. Establishment of Game Reserves