Jamb Biology 1983 Past Questions and Answers

Question 31:

• JAMB 1983

In a positive phototropic response of a coleoptile, the region of greatest curvature is brought about by the

A. Movement of auxins away from the region of curvature
B. Even distribution of auxins in all parts of the coleoptile
C. Inhibition of growth by auxins in the region f smaller curvature
D. Concentration of auxins in the region of curvature
E. Absence of auxins in the coleoptile

Question 32:

• JAMB 1983

The tuber cassava is NOT a stem tuber because it

A. Is distended with food reserve
B. Has an aerial shoot portion
C. Has other structure that could be called root
D. Lacks axillary buds
E. Has a bark over its stored food

Question 33:

• JAMB 1983

The function of the ossicles (malleus, incus and stapes) in the mammalian ear is

A. Transmission of vibrations
B. Regulation of pressure
C. Support of the inner ear
D. Maintenance of balance during motion
E. Secretion of oil

Question 34:

• JAMB 1983

Which of the following instruments is used for determining turbidity of water?

A. Thermometer
B. Secchi disc
C. Rain guage
D. Hydrometer
E. Wind vane

Question 35:

• JAMB 1983

Which of the following is NOT a characteristic of monocot plants?

A. Occurrence of secondary thickening
B. Parallel venation
C. Scattered vascular bundles
D. Floral parts arranged in threes
E. Perianth is usually insignificant