Biology 2020 Waec Past Questions and Answers

Question 21 :

• WAEC 2020

The diagram above illustrates an ecological instrument. Study it and answer the question below;

A disadvantage of the abiotic factor measured by the instrument is that it


A. Is an agent of pollination
B. Is necessary for germination
C. Leads to flooding when in excess
D. Is used for irrigation

Question 22 :

• WAEC 2020

The diagram below is an illustration of an ecological instrument. Study it an answer the question below;

When the instrument is in use, it is usually

A. Placed slightly above soil level
B. Placed on a table
C. Suspended in air
D. Suspended to moving water

Question 23 :

• WAEC 2020

Soil with the finest texture is

A. Silt
B. Clay
C. Sand
D. Gravel

Question 24 :

• WAEC 2020

The position occupied by an organism in food chain is the

A. Energy level
B. Niche
C. Trophic level
D. Biomass

Question 25 :

• WAEC 2020

The depletion of the ozone layer will result in the earth surface receiving more

A. Gamma rays
B. Infra-red rays
C. Ultraviolet rays
D. X-rays