The document contains 6 multiple choice questions from PMR exams from 2006 to 2008 about human senses and sensory organs. The questions cover topics like parts of the eye, phototropism in plants, sensory organs that detect touch, geotropism in plants, the pathway of a sensory impulse, and changes in pupil size. The document also includes one short answer question about image formation in the eye.

1. THE WORLD THROUGH OUR SENSES
1 Diagram 6 shows a section through part of a human head containing sensory organ.
Diagram 6
Which of the parts labelled A, B, C or D is a sensory cell?
PMR 2008
2 Which part of a plant shows positive phototropism?
A Root
B Shoot
C Stem
D Fruit
PMR 2008
3 Which of the following sensory organs can detect touch, pain and pressure?
A Eyes
B Nose
C Ears
D Skin
PMR 2007
4 The Following information shows a type of response of a plant due to a stimulus.
- shoot grows away from the stimulus
- enables the plant to obtain water and minerals
- roots grow towards gravitional attraction
Which of the following is the response?
A Geotropism
B Phototropism
C Thigmotropism
D Hydrotropism
PMR 2006

2. 5 The diagram shows the path of an impulse after a stimulus is received by the skin.
Stimulus X Nerve Y Nerve Z
Which of the following represents X, Y and Z?
X Y Z
A Brain Effector Receptor
B Receptor Effector Brain
C Brain Receptor Effector
D Receptor Brain Effector
PMR 2005
6 The diagram shows a change in size of the pupil
Pupil
Which of the following action will cause this change?
A Reading a book in a dark room
B Entering a darkroom from a bright room
C Taking off sun glasses in a bright place
D Looking at a distance object after looking at a near object.
PMR 2004

3. 1 Diagram 1.1 shows how human eye can see. (PMR 2007)
Diagram 1.1
(a) (i) State one difference between object Q and image I.
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(1 mark)
(ii) How does the size of the image I change when the eye is 10 cm from object Q?
________________________________________________________________
(1 mark)
(iii) State one reason for the answer in 1(a)(ii).
________________________________________________________________
________________________________________________________________
(1 mark)
(b) (i) Complete Diagram 1.2 to show the formation of an image of a distant object on
the retina of the eye of a short sighted person.
Diagram 1.2
(ii) What causes the situation in Diagram 1.2 to happen?
________________________________________________________________
________________________________________________________________
(1 mark)
(iii) How can the situation in Diagram 1.2 be corrected?
_______________________________________________________________
(1 mark)

4. THE WORLD THROUGH OUR SENSES
ANSWER:
1. B
2. B
3. D
4. D
5. D
6. C
The world through our senses
PMR 2007
1(a) (i) The image I is smaller. / The image I is inverted.
(ii) The image is becomes larger.
(iii) The nearer the object to the lens, the larger the image. / Angle of incidence
is larger.
(b) (i)
(ii) The eyeball is longer than normal./ The lens is too thick.
(iii) Use concave lens or diverging lens / Laser surgery