Question 326:

• JAMB 1983

Which of the following represents the evolutionary sequence in these plants? 1. Flowering plants 2. Ferns 3. Mosses 4. Algae 5. Conifers

A. 2 → 1 → 4 → 3 → 5
B. 5 → 4 → 3 → 2 → 1
C. 2 → 4 → 5 → 1 →3
D. 3 → 2 → 4 → 5 → 1
E. 4 → 3 → 2 → 5 → 1

Question 327:

• JAMB 1983

Which of the following statements on the mammalian circulatory system is NOT true?

A. Blood in the pulimonary artery is richer in oxygen content than blood in the pulmonary vein
B. The blood in the hepatic portal vein is the richest in food substance
C. Blood flow is controlled by valves in the veins
D. Arteries are generally thicker and larger than veins
E. Fibrin helps in the formation of blood clot

Question 328:

• 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 329:

• 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 330:

• 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