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Primary 5 Science Practice Paper 1
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TuitionGoWhere Practice Paper - Science Primary 5 (Answer Key)
Subject: Science
Level: Primary 5
Paper: Practice Paper 1 (Version 1)
Total Marks: 100
BOOKLET A (56 marks)
Section A: Multiple-Choice Questions (40 marks)
1. Answer: (3) The nucleus controls all activities in the cell. [2]
Explanation:
- The nucleus contains genetic material (DNA) and controls all cellular activities.
- (1) is incorrect: Only plant cells, fungi, and bacteria have cell walls; animal cells do not.
- (2) is incorrect: Chloroplasts are found only in plant cells and some protists, not in animal cells.
- (4) is incorrect: Both plant and animal cells have a cell membrane.
Common mistake: Confusing cell wall (plants only) with cell membrane (all cells).
2. Answer: (2) Cell membrane [2]
Explanation:
- The cell membrane is selectively permeable and controls the movement of substances in and out of the cell.
- The cell wall provides structural support but is fully permeable.
- Cytoplasm is the jelly-like substance where organelles are suspended.
- The nucleus controls cell activities but not substance movement across the membrane.
3. Answer: (4) A crystal growing larger in a saturated solution [2]
Explanation:
- Crystal growth is a physical process (crystallisation), not biological reproduction.
- (1) Yeast budding = asexual reproduction.
- (2) Potato from "eye" = vegetative reproduction (asexual).
- (3) Fern producing spores = reproduction via spores.
Key concept: Reproduction involves living organisms producing offspring. Crystals are non-living.
4. Answer: (3) Maize, Bean, Fern [2]
Explanation:
- Organism A: Reproduces by seeds, has one seed leaf (monocot) → Maize (corn is a monocot).
- Organism B: Reproduces by seeds, has two seed leaves (dicot) → Bean (dicot).
- Organism C: Does not reproduce by seeds, reproduces by spores → Fern (pteridophyte).
- Mushroom is a fungus (reproduces by spores but not a plant).
5. Answer: (3) In the ovule [2]
Explanation:
- Fertilisation in flowering plants occurs when the male nucleus from the pollen tube fuses with the female nucleus (egg cell) inside the ovule.
- Pollination deposits pollen on the stigma (1).
- Pollen tube grows down the style (2).
- Anther (4) produces pollen but is not the site of fertilisation.
6. Answer: (2) Pollination → Fertilisation → Seed dispersal → Germination [2]
Explanation:
Correct sequence:
- Pollination – transfer of pollen to stigma
- Fertilisation – fusion of male and female nuclei in ovule → seed forms
- Seed dispersal – seeds spread away from parent plant
- Germination – seed develops into new plant under suitable conditions
7. Answer: (2) The sperm can move on its own but the egg cannot. [2]
Explanation:
- Sperm has a tail (flagellum) for swimming; egg is non-motile.
- (1) False: Egg (~100 µm) is much larger than sperm (~50 µm).
- (3) False: One egg released per menstrual cycle; millions of sperm produced.
- (4) False: Egg contains large cytoplasm with food stores (yolk); sperm has minimal cytoplasm.
8. Answer: (2) In the fallopian tube [2]
Explanation:
- Fertilisation typically occurs in the fallopian tube (oviduct) where the sperm meets the egg after ovulation.
- Ovary (1) releases the egg.
- Uterus (3) is where the fertilised egg implants and
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TuitionGoWhere Practice Paper - Science Primary 5 (Answer Key)
Subject: Science
Level: Primary 5
Paper: Practice Paper 1 (Version 1)
Total Marks: 100
BOOKLET A (56 marks)
Section A: Multiple-Choice Questions (40 marks)
| Question | Answer | Explanation |
|---|---|---|
| 1 | (3) | The nucleus controls all activities in the cell. Cell walls are only in plant cells; animal cells lack chloroplasts; plant cells have both cell wall and cell membrane. |
| 2 | (2) | The cell membrane controls the movement of substances in and out of the cell. The cell wall provides structural support. |
| 3 | (4) | Crystal growing is a physical process, not reproduction. Yeast budding, potato eyes, and fern spores are all reproductive methods. |
| 3 | (3) | Maize (monocot, one seed leaf) → Organism A; Bean (dicot, two seed leaves) → Organism B; Fern (reproduces by spores, no seeds) → Organism C. |
| 5 | (3) | Fertilisation occurs in the ovule where the male nucleus fuses with the female nucleus. |
| 6 | (2) | Correct order: Pollination → Fertilisation → Seed dispersal → Germination. |
| 7 | (2) | Sperm has a tail for motility; egg is non-motile. Sperm is smaller; egg is produced one at a time; egg contains food stores (cytoplasm). |
| 8 | (2) | Fertilisation usually occurs in the fallopian tube. |
| 9 | (3) | The fertilised egg implants and develops in the uterus. |
| 10 | (3) | Amniotic fluid protects, allows movement, and maintains temperature. Oxygen and nutrients are supplied via the placenta and umbilical cord. |
| 11 | (3) | Evaporation is the change from liquid to gas. Melting (solid→liquid), Freezing (liquid→solid), Condensation (gas→liquid). |
| 12 | (2) | Water vapour changing to tiny droplets to form clouds is condensation. |
| 13 | (1) | Towel A: Outdoors, sunny (heat), windy (air movement) → fastest evaporation. |
| 14 | (3) | Xylem transports water and mineral salts from roots to leaves. Phloem transports food. |
| 15 | (3) | Pulmonary artery carries oxygen-poor blood from the right ventricle to the lungs. |
| 16 | (1) | Air path: Nose → Trachea → Bronchi → Lungs → Alveoli. |
| 17 | (3) | Series circuit: closing the switch completes the circuit; both bulbs light with equal brightness (same current). |
| 18 | (3) | Copper is a good conductor; rubber, plastic, wood are insulators. |
| 19 | (1) | Circuit Z (single bulb) brightest; Circuit Y (parallel) each bulb gets full voltage; Circuit X (series) bulbs share voltage → dimmest. Order: Z, Y, X. |
| 20 | (3) | In a series circuit, if one bulb fuses, the circuit is broken and the other bulb goes out. |
Section B: Structured Questions (16 marks)
21.
(a) Plant cell
(b) It has a cell wall / large central vacuole / chloroplasts (any one).
22.
(a) Organism P
(b) Organism Q
23.
(a) Anther
(b) Pollen grains (male reproductive cells)
24.
(a) Sperm
(b) In the egg (specifically, in the cytoplasm of the egg / ovum)
25.
A: Evaporation
C: Precipitation
26.
(a) Xylem
(b) Towards the centre / inner side of the stem (or "towards the pith")
27.
(a) The heart pumps blood to the lungs to pick up oxygen, then pumps the oxygen-rich blood to the rest of the body.
(b) It prevents the backflow of blood / ensures blood flows in one direction.
28.
(a) Bulbs in Circuit A (series) are dimmer; bulbs in Circuit B (parallel) are brighter.
(b) In a series circuit, the voltage is shared between the bulbs. In a parallel circuit, each bulb receives the full voltage of the battery.
BOOKLET B (44 marks)
Open-Ended Questions
29.
(a) Cell wall – gives the cell a fixed/regular shape; provides support and protection.
(b) Chloroplasts – contain chlorophyll to trap light energy for photosynthesis.
(c) The cell membrane controls the movement of substances in and out of the cell.
30.
(a) Pollination is the transfer of pollen grains from the anther to the stigma.
(b) Fertilisation is the fusion of the male nucleus (from pollen) with the female nucleus (in the ovule).
(c) After fertilisation, the ovary develops into the fruit and the ovules develop into seeds.
31.
(a) The foetus obtains oxygen and nutrients through the umbilical cord from the mother's blood via the placenta.
(b) The placenta allows the exchange of oxygen, nutrients, and waste between the mother's blood and the foetus's blood without the two blood supplies mixing.
32.
(a) Water evaporates from the wet towel into the surrounding air.
(b) The wind / moving air carries away the water vapour around the towel, reducing humidity and increasing the rate of evaporation.
(c) Spreading the towel out increases the exposed surface area, allowing more water to evaporate at the same time.
33.
(a) Xylem: transports water and mineral salts from roots to other parts of the plant.
(b) Phloem: transports food (sugar) made in the leaves to all parts of the plant.
(c) The roots absorb water and mineral salts from the soil.
34.
(a) The heart acts as a pump to circulate blood around the body.
(b) Arteries carry blood away from the heart (usually oxygen-rich); veins carry blood back to the heart (usually oxygen-poor).
(c) At the capillaries, oxygen and nutrients are exchanged with the body cells.
35.
(a) The nose traps dust and germs with nose hair and mucus; warms and moistens the air.
(b) In the alveoli, oxygen diffuses into the blood and carbon dioxide diffuses out of the blood into the alveoli to be exhaled.
(c) The diaphragm contracts and moves downwards, increasing the volume of the chest cavity, causing air to rush into the lungs.
36.
(a) A closed circuit is a complete, unbroken loop of conducting material from one terminal of the battery, through the components, and back to the other terminal.
(b) The bulb will not light up because the circuit is open/broken; there is no complete path for electric current to flow.
(c) The switch controls the flow of electricity by opening (off) or closing (on) the circuit.
37.
(a) Circuit X (series): If one bulb fuses, the other goes out. Circuit Y (parallel): If one bulb fuses, the other stays lit.
(b) Parallel circuit (Circuit Y). Each bulb has its own path to the battery; if one path breaks, the other remains complete.
38.
(a) Conductor: allows electricity to pass through (e.g., copper, aluminium). Insulator: does not allow electricity to pass through (e.g., rubber, plastic).
(b) The metal tip conducts electricity to complete the circuit; the plastic casing insulates the user's hand from the electricity.
(c) To prevent electric shock / for safety.
39.
(a) The brightness of the bulb decreases / the bulb becomes dimmer.
(b) Adding more bulbs in series increases the total resistance of the circuit, reducing the current flowing through each bulb.
(c) Arrange the bulbs in parallel. Each bulb will receive the full voltage and shine at maximum brightness.
40.
(a) The steel rod becomes an electromagnet / is magnetised.
(b) Increase the number of coils of wire around the rod / increase the number of batteries (voltage) / use a thicker wire / use a soft iron core instead of steel. (Any one)
(c) The steel rod retains its magnetism (becomes a permanent magnet) while the iron rod loses its magnetism when the current is switched off. Steel is a magnetic material that is hard to magnetise but retains magnetism; iron is easy to magnetise but loses it easily.
End of Answer Key