Page 233 - SCIENCE DLP T6 SK (SEMAKAN 2017)

4. Tomatoes: bottling, canning, waxing, boiling, cooling 3. (a) The Milky Way galaxy
Shrimps: drying, freezing, vacuum packing (b) Barred spiral
Guavas: cooling, vacuum packing, canning, 4. P: Barred centre of the galaxy
pickling, waxing Q: Spiral arm of the galaxy
5. Freezing, vacuum packing, and smoking. 5. (a) X : Solar System; Y : The Milky Way galaxy
(b) The Sun
UNIT 9 WASTE MATERIALS 6. (c) and (d)
Suggested Answer for HOTS (page 158) 7. (a) The Milky Way galaxy
Accept any suitable answers. (b) This galaxy is a barred spiral-shaped galaxy and
Mind Test (page 164) the Solar System is located in it.
1. Plastic: plastic bottles, plastic bags 8. thin disc, bulges
Paper: magazines, newspapers, egg trays, boxes UNIT 12 STABILITY AND STRENGTH
Glass; aluminium cans, drinking glasses, mirrors
Metal: aluminium cans, milk cans, food cans Mind Test (page 210)
2. (a) Biodegradable waste is materials that 1. Flowerpot B, because it is shorter than flowerpot A.
can be decomposed by microorganisms. 2. (a) The stability of objects and structures is the ability of
(b) Non-biodegradable waste is materials that cannot the objects and structures to remain stable or for the
be decomposed by microorganisms. objects to return to their original positions.
3. (a) metal, paper, plastic, rubber, glass (b) The strength of objects and structures is the ability
(b) According to common characteristics determined of the objects and structures to withstand a force that
by the pupils. could damage or change their structural shapes.
(c) These waste materials may cause environmental 3. Factors affecting the stability of objects and structures
pollution. are base area and height. Factors affecting the strength
(d) Carry out 5R programmes. of objects and structures are type of material and
shape of a structure.
UNIT 10 ECLIPSE 4. (a) Wooden block B
Suggested Answer for HOTS (page 171) (b) Wooden block B is less stable.
During an eclipse of the Moon, the light from the Moon is (c) The base area of wooden block B can be increased
safe to be observed because the Moon does not emit its by changing its orientation.
own light but reflects light from the Sun to Earth. (d) As the height of the wooden block increases,
Mind Test (pages 177-178) its stability decreases.
1. Total eclipse of the Moon; Partial eclipse of the Sun; 5. Strong and stable structures are not easily damaged,
Total eclipse of the Sun; Partial eclipse of the Moon can be used for a long time, low maintenance cost,
2. (a) and (d) and safe to be used.
3. (a) Total eclipse of the Sun UNIT 13 TECHNOLOGY
(b) The Moon is between the Sun and Earth in a straight Mind Test (page 222)
line and the shadow of the Moon’s umbra is formed 1. Technology is an application of scientific knowledge to
on Earth’s surface. overcome human limitations.
(c) Special glasses, suitable filters or pinhole camera. 2. (a) Microscope
4. Sun; a straight line; new moon (b) Loudspeaker and microphone
5. (a) Total eclipse of the Moon 3. (a) The use of technology to spray fertilisers and
(b) Shadow A is umbra and shadow B is penumbra. pesticides makes farming easier and can save
(c) Sunlight travels in a straight line and cannot pass time, as well as human resources.
through opaque objects such as Earth and the (b) This technology can help maintain the quality and
Moon. improve crop production.
(d) Eclipse of the Sun 4. (a) In the field of medicine
6. (a) The level of the sea tides rises. (b) New medical devices are being invented to enable
(b) The surrounding conditions becomes darker and efficient diagnosis and treatments.
the surrounding temperature decreases.
(c) An improved quality of healthcare and well-being
UNIT 11 GALAXY of humans can be achieved.
Mind Test (pages 190-192)
1. (a) The galaxy consists of millions of stars, gases, dust,
and other matter.
(b) Spiral-shaped galaxy
2. (a) galaxy; barred spiral
(b) The Sun; seven; The Milky Way
(c) sizes; shapes

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