Waec Biology 1991 Past Questions and Answers

Question 31:

• WAEC 1991

Which of the following adapts the aorta to the high pressure of the blood from the heart?

A. Thin walls
B. Fragile membrane
C. Thick elastic walls
D. Stiff walls
E. Narrow lumen

Question 32:

• WAEC 1991

The part of the alimentary system of a bird where grinding of maize occurs is the

A. Crop
B. Stomach
C. Gizzard
D. Cloaca
E. Rectum

Question 33:

• WAEC 1991

Natality is a factor affecting population density because it involves

A. Increase in population due to immigration
B. Increase in population due to emigration
C. The number of mature females in the population
D. The number of females in the population
E. The number of all young ones produced in the population

Question 34:

• WAEC 1991

The female part of a flower consist of the

A. Stigma, style and ovary
B. Petals, sepals and anthers
C. Stigma, sepals and anthers
D. Filaments, style and pollen grain
E. Sepals, stigma and pollen grain

Question 35:

• WAEC 1991

Puddles,ponds, rivers, lakes, seas and ocean are grouped together as

A. Ecosystem
B. Biosphere
C. Terrestrial habitat
D. Marine habitat
E. Aquatic habitat