Chapter 16 test

Direction: The diagram shows a section of a human eye.

Which of the labelled structures is / are involved in converging light rays onto the retina?

• 2 only

• 1 and 2 only

• 2 and 4 only

• 1, 2 and 4 only

Direction: The diagram shows a section of a human eye.

Which of the following statements about structure 3 is / are correct?

(1) It supplies nutrients and oxygen to the cells of the eye.

(2) It is shiny to reflect light.

(3) It is tough in order to protect the eyeball.

• (1) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

The curvature of the lens can be changed by the contraction or relaxation of the

• eye muscles.

• iris muscles.

• ciliary muscles.

• suspensory ligaments.

What happens in the eye when a person walks from bright daylight into a dark room?

• A

• B

• C

• D

When people get old, they usually have difficulties in focusing their eyes when looking at nearby objects. This is because

• their cornea has become uneven.

• their lens has become inelastic.

• their vitreous humour has become cloudy.

• their eyeball has become smaller.

Directions: The diagram shows the structure of a human ear.

Which of the following structures is not involved in hearing?

• A. 4

• B. 5

• C. 6

• D. 7

Directions: The diagram shows the structure of a human ear.

Structure 3 helps to

(1) amplify vibrations.

(2) transmit vibrations.

(3) equalize the pressure on both sides of structure 5.

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Directions: The diagram shows the structure of a human ear.

What would happen if structure 7 were cut?

(1) Hearing of that ear would be lost.

(2) Touch of structure 4 would not be felt.

(3) Maintenance of body balance would become difficult.

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Directions: The graph shows the effect of auxin concentration on the growth of roots and shoots.

Which auxin concentrations will stimulate growth of both the roots and shoots?

• 10^-6 to 10^-4 ppm

• 10^-4 to 10^-2 ppm

• 10^-4 to 10² ppm

• 10^-6 to 10² ppm

Directions: The graph shows the effect of auxin concentration on the growth of roots and shoots.

• It will grow towards the left.

• It will grow towards the right.

• It will grow straight upwards.

• It will not grow at all.