Biology Practice Test – The Transport Systems

Which of the following results is to be expected if the set-up is left for several hours?

A. Decrease in the size of the yam
B. Movement of the salt solution into the water
C. Decrease in the volume of water inside the yam
D. Movement of water from the salt solution into the yam

In active transport, molecules move against a concentration gradient, therefore, ______

A. molecules move from a region of low concentration to a region of high concentration.
B. molecules move from a region of high concentration to a region of low concentration.
C. the concentration gradient has little effect on the movement of molecules.
D. molecules force their way through special channels.

Carbon dioxide is carried in the plasma _______

A. in combination with haemoglobin
B. in combination with antibodies
C. by capillary action
D. as bicarbonate ion.

The organ that receives reduced flow of blood during vigorous exercise is the _____

A. brain      B. heart.      C. lung.     D. limb.

Which of the following features is not characteristic of arteries? Arteries _______

A. possess valves at intervals throughout their length.
B. have thick, muscular and elastic walls.
C. carry blood away from the heart.
D. transport oxygenated blood with the exception of the pulmonary artery.