Question 356:

• JAMB 1984

The mammalian organ through which nourishment and oxygen diffuse into a developing embryo is called

A. Amnion
B. Chorion
C. Umbilical cord
D. Oviduct
E. Placenta

Question 357:

• JAMB 1984

Osmosis can be defined as the movement of

A. Molecules from solution of higher concentration to low concentration
B. Molecules from solution of low concentration to high concentration
C. Water from solution of high concentration to low concentration
D. Water across a semi-permeable membrane from solution of low concentration to high concentration
E. Water across a semi-permeable membrane from solution of high concentration to low concentration

Question 358:

• JAMB 1984

Which of the following statement is NOT true of enzymes? They

A. Are proteins
B. Need cofactors to activate them
C. Are sensitive in their action
D. Are specific in their action
E. Can withstand high temperature

Question 359:

• JAMB 1984

The dorsal and anal fins of fish are used for

A. Upward movement
B. Controlling rolling
C. Downward movement
D. Steering
E. Buoyancy

Question 360:

• JAMB 1984

Exoskeleton is NOT found in the

A. Maggot
B. Mosquito larva
C. Earth worm
D. Caterpillar
E. Termite