Biology Past Questions and Answers

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:

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:

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:

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

A Insulin
B Adrenalin
C Thyroxine
D Pituitrin
E Progesterone

Question 180:

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