Waec Biology Past Questions and Answers

Question 161:

• WAEC 1991

Which of the following substance from the mother's blood diffuse through the placenta into the blood vessels of the feotus?

A. Carbon dioxide and oxygen
B. Glycogen and starch
C. Urea and carbon dioxide
D. Glucose and oxygen
E. Digested food and carbon dioxide

Question 162:

• WAEC 1991

Which of the following is not seen in the transverse section of a young monocotyledonous stem?

A. Parenchyma
B. Phloem
C. Xylem
D. Cambium
E. Sclerenchyma

Question 163:

• WAEC 1991

The bicuspid valve is located between

A. Left auricle and left ventricle
B. Right auricle and right ventricle
C. Left and right ventricle
D. Left and right auricle
E. Left auricle and right ventricle

Question 164:

• WAEC 1991

During which o the following processes is food for animals produced?

A. Photosynthesis
B. Respiration
C. Nutrition
D. Digestion
E. Transportation

Question 165:

• WAEC 1991

Pellagra can be prevented by taking food rich in

A. Vitamin A
B. Vitamin B
C. Vitamin D
D. Calcium
E. Iodine