Page 22 - Focus PT3 2020 Science ( BI Version )

Form 1 of a ream of paper is divided by 450. In SECTION B
this way, the mass of 1 sheet of paper
is estimated. 1. (a) (i) Beaker Form Form
Chapter Introduction to Scientific (ii) Filter funnel
1 Investigation Daily Application (b) (i) Measures the time
Form
Form
(ii) Measures the length 1 1
Air conditioner is best placed at the top of
Formative Practice 1.1 the wall of a room because it produces cold SECTION C
air. The cold air which is denser than warm 1. (a) (i) Measuring cylinder
1. A natural phenomenon is an observable air will go down in the room and replace the (ii) To determine the volume of liquids
event which is not man-made. warm air. At the same time, the less dense (iii) 22.0 cm 3
2. • Invention of telephone allows people warm air goes up and the room is cooled (iv) Burette, pipette
to communicate at a distance. very quickly. (v) Water displacement method
• Invention of Internet allows people to (b) (i) Density = Mass
search and access a vast amount of Volume
information from home. HOTS Challenge (ii) The density of gold = 20
Praktis Formatif 1 1
3. Doctor, forensic scientist, botanist 1 -3
(Accept other reasonable answers) = 20 g cm
-3
The densitiy of pure water is 1 g cm and the The density of glass = 2 1
3
Formative Practice 1.2 volume of water given is 73.6 cm . = 2 g cm -3
Mass of water
= Density of water x Volume of water (ii) Gold is denser than glass
1. The bottle contains chemical that = 1 x 73.6 (iv) The mass of gold is higher than
catches fire easily / flammable. = 73.6 g that of glass.
2. A fire may occur. When water turns into ice, its mass remains
3. Get out as quickly and safely as unchanged. Therefore, 73.6 cm of water will Chapter Cell as the Basic Unit of
3
possible from the fire to a safer place. freeze to form 73.6 g of ice. 2 Life
Formative Practice 1.3 Mass of water = Mass of ice = 73.6 g.
As given, the density of ice = 0.92 g cm . TIMSS Challenge 1
-3
1. Hence, the volume of ice can be calculated:
Physical S.I. unit Symbol of Mass of ice
quantity S.I unit Volume of ice = ____________ Methylene blue solution is used to colour
Density of ice (dye) the cheek cell so that the structure can
Mass kilogram kg 73.6 g be seen clearly under a microscope.
= ______ -3
Time second s 0.92 g cm TIMSS Challenge 2
= 80 cm 3
Temperature Kelvin K
Formative Practice 1.5 Chloroplast and cell wall
2. (a) 1 200 m
(b) 10.08 m 1. Density of water HOTS Challenge 1
Praktis Formatif 1
(c) 0.57 m 1 000 g
1 000 kg
= ________ x ___________ 3 Blood is not a cell but a connective tissue
3
Formative Practice 1.4 1 m 1 000 000 cm because it contains different cells (red blood
= 1 g cm -3 cells, white blood cells, plasma and platelets)
1. Measuring tape that work together to achieve a specific
3
2. A clinical thermometer is more accurate Hence, 1 cm of water has a mass of 1 g. function in our body.
than a laboratory thermometer because 2. (a) Egg is denser than water.
clinical thermometer can measure (b) The egg will float on the water. Formative Practice 2.1
temperature accurately up to 0.1°C, (c) Ice floats on the ocean water.
whereas laboratory thermometer can 1. 5 → 1 → 3 → 4 → 2
measure with the accuracy of only 1°C. 2. Nerve cells – Receive and send nerve
3. (a) Vernier calipers Formative Practice 1.6 impulse
(b) 2.53 cm Sperm cells – Involved in reproduction
(c) To obtain a more accurate reading, Make a new hypothesis and carry out an Muscle cells – Allow body movement
zero error has to be taken into experiment to test the hypthothesis.
consideration. Red blood cells – Transport oxygen
(d) • If the zero error is a positive zero Formative Practice 1.7 3. The differences between an animal cell
and plant cell are as below.
error, the actual reading should
be 2.53 – 0.04 = 2.49 cm. No. Aishah should be honest while recording Animal cell Plant cell
• If the zero error is a negative and validating data.
zero error, the actual reading No cell wall Has cell wall
should be = 2.53 – (-0.04)
= 2.57 cm PT3 Practice 1 No chloroplast Has chloroplast
4. Weigh the mass of a ream of A4 paper SECTION A
(450 sheets of paper). Then, the mass No fixed shape Has fixed shape
1. B 2. A 3. C 4. C
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00 Answer Fok Science PT3.indd 531 11/19/19 11:31 AM