JAMB Biology Past Questions & Answers - Page 160

796.

The part of the brain responsible for peristalsis is the

A.

Olfactory Lobe

B.

Medulla Oblongata

C.

Hypothallamus

D.

Thalamus

Correct answer is B

No explanation has been provided for this answer.

797.

The circulation of blood to all parts of the body except the lungs is through?

A.

the pulmonary artery

B.

systemic circulation

C.

the lymphatic system

D.

pulmonary circulation

Correct answer is B

The systemic circulation is the part of the vascular system that carries blood from the left ventricle to organs and tissues of the body.

Pulmonary circulation moves blood between the heart and the lungs. It transports deoxygenated blood to the lungs to absorb oxygen and release carbon dioxide.

798.

The primary structure responsible for pumping blood for circulation through the mammalian circulatory systems is the

A.

veins

B.

right auricle

C.

arteries

D.

left ventricle

Correct answer is D

The left ventricle pumps the oxygen-rich blood through the aortic valve out to the rest of the body.

799.

When a mixture of a food substance and Benedict's solution was warmed, the solution changed from blue to brick-red. This indicates the presence of

A.

reducing sugar

B.

fatty acid

C.

sucrose

D.

amino acid

Correct answer is A

During a water bath, which is usually 4–10 minutes, the solution of the mixture and Benedict's solution should progress in the colors of blue (with no reducing sugar present), orange, yellow, green, red, and then brick red precipitate or brown (with high reducing sugar present). A color change would signify the presence of a reducing sugar.

800.

i. Growth is mainly apical
ii. Growth is specific with definite shape
iii. Growth is throughout life.

Which of the above correctly describes the growth pattern in plants?

A.

i, ii, and iii only

B.

ii and iii only

C.

i and ii only

D.

i and iii only

Correct answer is D

No explanation has been provided for this answer.