Waec Biology 2018 Past Questions and Answers

Question 31:

• WAEC 2018

The diagram above is an illustration of organisms in an air-tight aquarium.The most important factor needed by the organisms is

A. Light energy
B. Low humidity
C. Oxygen
D. Nitrate

Question 32:

• WAEC 2018

Which of the following instruments is used to determine the turbidity of water?

A. Hygrometer
B. Hydrometer
C. Secchi disc
D. Rain gauge

Question 33:

• WAEC 2018

In an ecosystem, the least efficient energy transfer link is from the

A. Secondary consumers to decomposers
B. Sun to producers
C. Primary consumers to secondary consumers
D. Producer to primary consumers

Question 34:

• WAEC 2018

Xerophytes have the following characteristics aimed at conserving water except

A. Thick cuticle
B. Broad leaf surfaces
C. Sunken stomata
D. Waxy cuticle

Question 35:

• WAEC 2018

An association between living organisms in which one lives on and feeds at the expense of the other is known as

A. Commensalism
B. Predation
C. Parasitism
D. Mutualism