Question 176:

• JAMB 1980

If the bark and phloem tissue of a woody shoot are peeled off by ringing, the whole plant will die eventually die because?

A. Water does not reach the leaves
B. Water and salts remained below the ring portion
C. There is a withdrawal of water from the root by soil
D. Manufactured food does not reach the roots
E. The roots store too much water

Question 177:

• JAMB 1980

The filament of spirogyra were put into equal volumes of sugar solutions X and Y. After 5 minutes, filaments from solution X had their cells contents rounded up while those from Y were unaffected. The experiment shows that

A. Solution X was stronger than Y
B. Solution Y was stronger than X
C. Spirogyra used up the sugar in solution X
D. Solution X is good for stimulating sexual reproduction in Spirogyra
E. Solution Y was less contaminated than X

Question 178:

• JAMB 1980

which part of the human brain is concerned with reflexes controlling the rate of heart beat and breathing?

A. Medulla
B. Cerebrum
C. Cerebellum
D. Pineal body
E. Olfactory lobe

Question 179:

• JAMB 1980

Which of the following hormones is produced during fright or when agitated?

A. Insulin
B. Adrenalin
C. Thyroxine
D. Pituitrin
E. Progesterone

Question 180:

• JAMB 1980

The following are connected with the movement of a reflex action (1) Central nervous (2) Muscles (3) Skin (4) Sensory nerve (5) Motor nerve. Which of the following sequences indicates a correct path?

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