Page 28 - Genius PBD Science Year 4

Science Year 4 Answers

• Distance of light
UNIT 4 Plants
SUMMATIVE PRACTICE 4 source from the object
• Size of the shadows
4.1 Plant Responses to Stimuli
Objective Questions formed
1. (a) Shoots 1. D 2. A 3. C 4. A 5. D • Position of the screen
(b) Roots 6. A 7. A 8. B Steps:
(c) Leaves 1. An opaque object
(d) Roots Subjective Questions (ball) is placed at
2. different distances (5
(a) To show that sunlight is cm, 10 cm, 15 cm and
Parts of Type of needed by plants to carry out 20 cm) from the
the plant stimulus photosynthesis / make food. source of light (torch).
Leaves Water (b) Leaf Q turns yellow. 2. The size of the
(a) (c) Leaf Q did not get sunlight shadows formed
Roots Gravity to produce food / carry out are measured and
(b) Light photosynthesis. recorded in a table.
Shoots (d) (i) Responding variable Results:
(c) Touch (ii) Manipulated variable
3. (a) (i) The seedlings bent (e) Plants need sunlight to carry Distance between The size of the
the object from
towards the hole. out photosynthesis / make shadow formed
(ii) The roots of the seedlings food. source of light (cm)
bent towards the wet (cm)
cotton. UNIT 5 Properties of Light 5 12
(iii) The roots of the seedlings 10 10
bent downwards towards 5.1
gravitational pull. Light Travels in a Straight Line 15 8
(b) Plants respond to gravity, 1. (a) Ainul cannot see the light 20 6
water and light stimuli. from the candle, while
4. Pupil’s answer Mardhiah can see the light Conclusion:
The bigger the distance
from the candle. between the object and the
4.2 Photosynthesis (b) Mardhiah can see the light light source, the smaller is the
from the candle because light shadow formed.
5. (a) photosynthesis travels in a straight line. (b) (i) The shape of the
(b) sunlight (c) Light travels in a straight line. shadows changes.
(c) carbon dioxide (d) Using a torch at night (ii) The shape of the
(d) water (e) The shadow of the book shadows changes
(e) glucose because the position of
(f) oxygen will be formed on the wall the torch changes.
because the light is blocked
6. (a) sunlight, carbon dioxide, by an opaque object which is (c) The position of the source of
water, chlorophyll light
(b) chlorophyll the book. (d) The position of the object
(c) Sunlight 2. (a) (i) Paper cup
(d) glucose, oxygen (ii) Clear glass cup 5.2 Reflection of Light
(e) surroundings, starch (b) The paper cup produces clear
(f) Roots shadow because it is opaque 4. (a) Sunlight is reflected through a
(g) move in nature that does not allow mirror.
7. • Supplies oxygen to animals light to pass through it. (b) Light can be reflected
(c) (i) Front mirror and side
and humans (c) Light travels in a straight line mirrors of a car
• Supplies the source of food to (d) Leather (ii) Dental mirrors used by
humans and animals 3. (a) (i) The size of the shadow
• Maintains the balance of gas becomes smaller when (d) dentists
composition in the air the distance between the
• Cools the Earth by reducing the flower pot and the torch Light hitting Light reflected
from the
amount of carbon dioxide in increases. the surface surface of mirror
of mirror
the air (ii) Aim: To determine the
• Absorb carbon dioxide factors that affect the size
released by animals and of the shadow.
humans Variables:
8. Pupil’s answer Mirror

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13 Jawapan Genius PBD SCIENCE YR4.indd 3 19/10/2022 5:13 PM