Biology 2019 Waec Past Questions and Answers

Question 21 :

• WAEC 2019

The digestion of proteins starts in the ____________

A. Small intestine
B. Stomach
C. Large intestine
D. Mouth

Question 22 :

• WAEC 2019

Tooth decay is usually caused by _____________

A. Undigested and absorbed food
B. Eating a limited amount of sweetened food.
C. The bacteria ín the mouth that metabolize sugar to acids
D. Eating a lot of proteinous foods

Question 23 :

• WAEC 2019

The conversion of ammonium salts into nitrates is called ____________

A. Putrefaction
B. Denitrification
C. Fixation
D. Nitrification

Question 24 :

• WAEC 2019

The salinity of a brackish habitat ____________

A. Increases immediately after rainfall
B. Increases at the end of the rain
C. Decreases with an increase in the number of organisms
D. Increases during the dry season

Question 25 :

• WAEC 2019

If 90 ants are found in a field with a total area of 100 m. what is the population density of the ants?

A. 0.09
B. 0.90
C. 9.00
D. 90.00