Biology Past Questions and Answers

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 27:

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 28:

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

A Insulin
B Adrenalin
C Thyroxine
D Pituitrin
E Progesterone

Question 29:

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

Question 30:

Biconcave lenses are used in the correction of an eye defect called?

A Myopia
B Colour blindnes
C Old age
D Hypermetropia
E Weakening of ciliary muscles