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Primary 5 Science Practice Paper 5
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TuitionGoWhere Practice Paper - Science Primary 5 (Answer Key)
Subject: Science
Level: Primary 5
Paper: Practice Paper 5 (Version 5)
Total Marks: 100
SECTION A: Multiple-Choice Questions (56 marks)
1. Answer: (2) Anther
Marks: 2
Explanation: The anther is the part of the stamen (male reproductive part) that produces and contains pollen grains. The stigma receives pollen, the ovary contains ovules, and the style connects the stigma to the ovary.
2. Answer: (3) Non-flowering plants produce seeds.
Marks: 2
Explanation: Following the flow chart: Non-flowering plants branch from "Produces seeds? Yes" and "Has flowers? No". Conifers (e.g., pine trees) are non-flowering plants that produce seeds in cones. Mosses reproduce by spores (not seeds), moulds lack chlorophyll, and mammals give birth to live young (do not reproduce by spores).
3. Answer: (2) Fallopian tube
Marks: 2
Explanation: Fertilisation in humans typically occurs in the fallopian tube (oviduct), where the sperm meets the egg after ovulation. The fertilised egg then travels to the uterus for implantation.
4. Answer: (1) A
Marks: 2
Explanation: Ferns are non-flowering plants that reproduce by spores and have chlorophyll (they are green and photosynthesise). Organism A matches: reproduces by spores (Yes), has chlorophyll (Yes), produces seeds (No), has flowers (No).
5. Answer: (3) The adult mosquito lays eggs in water.
Marks: 2
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TuitionGoWhere Practice Paper - Science Primary 5 (Answer Key)
Subject: Science
Level: Primary 5
Paper: Practice Paper 5 (Version 5)
Total Marks: 100
SECTION A: Multiple-Choice Questions (56 marks)
| Question | Answer | Explanation |
|---|---|---|
| 1 | (2) Anther | The anther is the male reproductive part of a flower that produces pollen grains. |
| 2 | (3) Non-flowering plants produce seeds. | From the flowchart: Non-flowering plants branch from "Produces seeds? Yes" → "Has flowers? No". Conifers are non-flowering seed plants. |
| 3 | (2) Fallopian tube | Fertilisation (fusion of sperm and egg) typically occurs in the fallopian tube. |
| 4 | (1) A | Ferns reproduce by spores, have chlorophyll, do not produce seeds, and do not have flowers. This matches Organism A. |
| 5 | (3) The adult mosquito lays eggs in water. | Adult female mosquitoes lay eggs in stagnant water. Larva and pupa are aquatic but only larva feeds actively; pupa does not feed. |
| 6 | (3) Mushroom – Non-flowering plant, reproduces by spores | Mushrooms are fungi, not plants. They reproduce by spores but lack chlorophyll and do not photosynthesise. |
| 7 | (3) It is a plant cell because it has chloroplasts and a cell wall. | Plant cells have cell walls, chloroplasts, and large central vacuoles; animal cells lack these. |
| 8 | (2) To transport the male reproductive cell to the ovule | The pollen tube grows down the style to deliver the male gamete to the ovule for fertilisation. |
| 9 | (2) Higher temperature shortens the life cycle. | Total days decrease from 48 at 25°C to 35 at 30°C. All stages are shorter at higher temperature. |
| 10 | (2) Pollination → Fertilisation → Seed dispersal → Germination | Correct sequence: pollen transfer → fusion of gametes → seed formation & dispersal → new plant growth. |
| 11 | (2) Radicle | The radicle is the embryonic root; it emerges first during germination and develops into the root system. |
| 12 | (2) Small intestine | The small intestine (duodenum, jejunum, ileum) is the primary site for absorption of digested nutrients. |
| 13 | (2) The frog population will decrease. | Frogs feed on grasshoppers; removing their food source causes immediate population decline. |
| 14 | (3) Evaporation | The Sun provides heat energy for evaporation (liquid to gas) from water bodies and transpiration from plants. |
| 15 | (4) Z | Electrical wires need to conduct electricity (Yes) and be waterproof (Yes) for insulation/safety. Flexibility and transparency are not required. Material Z fits. |
| 16 | (3) Both bulbs will light up with equal brightness. | In a series circuit with identical bulbs, current is same through both; brightness is equal. |
| 17 | (4) Circuits A and C | Circuit A: single bulb gets full voltage. Circuit C: parallel bulbs each get full voltage. Circuit B: series bulbs share voltage → dimmer. |
| 18 | (4) Using a wooden core instead of an iron core | Wood is non-magnetic; iron core concentrates magnetic field. More coils, thicker core, more batteries all increase strength. |
| 19 | (3) Alveoli | Gaseous exchange (O₂ and CO₂ diffusion) occurs across the thin walls of alveoli and surrounding capillaries. |
| 20 | (3) Xylem transports water from roots to leaves. | Xylem: water & minerals upward. Phloem: food (sugar) both directions. |
| 21 | (2) Carbon dioxide | Exhaled air has more CO₂ (≈4%) and less O₂ (≈16%) than inhaled air (CO₂ ≈0.04%, O₂ ≈21%). |
| 22 | (3) The heart pumps blood to the lungs to get oxygen. | Deoxygenated blood → heart → lungs (pick up O₂) → heart → body. This describes pulmonary circulation. |
| 23 | (1) It allows only certain substances to pass through. | The cell membrane is selectively permeable, controlling movement of substances in/out of the cell. |
| 24 | (4) It controls all activities of the cell. | The nucleus contains DNA and directs cell functions (growth, metabolism, reproduction). |
| 25 | (2) It has a definite volume but no definite shape. | Liquids have fixed volume but take the shape of their container. |
| 26 | (3) The shadow will be larger. | Moving object closer to light source increases the angle of light blocked → larger shadow on screen. |
| 27 | (2) The temperature of the water increases. | When steam (gas) condenses to water (liquid), it releases latent heat of vaporisation, warming the water. |
| 28 | (3) The magnet attracts the iron nail. | Magnetic force acts at a distance on magnetic materials (iron, steel, nickel, cobalt) without contact. |
SECTION B: Open-Ended Questions (44 marks)
29. [4 marks]
a) The reproductive parts of the flower are the stamen (male) and pistil (female).
b) The anther (part of stamen) produces pollen grains. The ovary (part of pistil) contains ovules with female reproductive cells.
c) Pollination is the transfer of pollen from anther to stigma. Fertilisation is the fusion of male and female reproductive cells in the ovule.
d) After fertilisation, the ovary develops into the fruit and the ovules develop into seeds.
30. [3 marks]
a) Mammals give birth to live young (except monotremes), have hair/fur, and produce milk. Birds lay hard-shelled eggs, have feathers and beaks.
b) Both are vertebrates (have backbone), are warm-blooded, and breathe with lungs.
c) Example: Bat (mammal) vs. Sparrow (bird).
31. [3 marks]
a) Cell wall – gives shape and support; Chloroplasts – contain chlorophyll for photosynthesis; Large central vacuole – stores water and maintains turgidity.
b) Animal cells lack cell wall, chloroplasts, and large central vacuole. They have small vacuoles (if any) and irregular shape.
c) Both have cell membrane, cytoplasm, nucleus, mitochondria.
32. [4 marks]
a) Xylem transports water and mineral salts from roots to all parts of the plant. Phloem transports food (sugar) made in leaves to all parts (up and down).
b) Water evaporates from leaves (transpiration) creating a suction pull that draws water up the xylem. Root pressure and capillary action also help.
c) If xylem is damaged, water transport stops → plant wilts and may die. If phloem is damaged, food cannot reach roots/growing parts → growth stops.
33. [3 marks]
a) Producer: Grass (makes own food by photosynthesis).
b) Primary consumer: Grasshopper / Rabbit / Mouse (eat plants).
c) Energy flow: Sun → Grass → Grasshopper → Frog → Snake → Hawk.
d) Decomposers (bacteria, fungi) break down dead organisms and waste, returning nutrients to soil for plants to reuse.
34. [4 marks]
a) Evaporation – Sun heats water in oceans/rivers → water vapour rises.
b) Condensation – Water vapour cools at high altitude → forms tiny droplets (clouds).
c) Precipitation – Droplets merge and fall as rain when heavy.
d) Collection – Rain flows as surface runoff / groundwater back to oceans → cycle repeats.
35. [3 marks]
a) Conductor: Allows electricity to flow easily (e.g., copper, aluminium).
b) Insulator: Does not allow electricity to flow (e.g., plastic, rubber, wood).
c) Electrical wires use copper (conductor) inside plastic coating (insulator) to carry current safely without shock or short circuits.
36. [4 marks]
a) Series circuit: One path for current. If one bulb fuses, all go out. Bulbs share voltage → dimmer.
b) Parallel circuit: Multiple paths. If one bulb fuses, others stay lit. Each bulb gets full voltage → brighter.
c) Household lighting uses parallel circuits so each appliance works independently and gets full voltage (220V/110V).
37. [3 marks]
a) Inhalation: Diaphragm contracts (moves down), ribs move up and out → chest volume increases → air pressure decreases → air rushes in.
b) Exhalation: Diaphragm relaxes (moves up), ribs move down and in → chest volume decreases → air pressure increases → air rushes out.
c) Gaseous exchange in alveoli: Oxygen diffuses into blood; carbon dioxide diffuses out of blood into alveoli to be exhaled.
38. [4 marks]
a) Heat gain: Ice absorbs heat from warmer surroundings (air, table, hand).
b) Melting: Heat energy breaks bonds between water molecules in solid ice → liquid water. Temperature stays at 0°C until all melted.
c) Further heating: Liquid water absorbs more heat → temperature rises → eventually boils at 100°C → becomes steam (gas).
d) Reversible: Cooling steam → condensation (water) → freezing (ice). No new substance formed; physical change only.
39. [3 marks]
a) Transparent: Allows light to pass through clearly (e.g., clear glass) → no shadow / faint shadow.
b) Translucent: Allows some light through but scatters it (e.g., frosted glass) → faint, blurry shadow.
c) Opaque: Blocks all light (e.g., wood, metal) → dark, sharp shadow.
40. [3 marks]
a) Like poles repel (N-N or S-S); Unlike poles attract (N-S).
b) Magnetic materials (iron, steel, nickel, cobalt) are attracted to magnets. Non-magnetic materials (plastic, wood, copper, aluminium) are not.
c) Electromagnet: Temporary magnet made by passing current through coil around iron core. Strength can be changed; can be turned off. Permanent magnet stays magnetic always.
41. [3 marks]
a) Germination requires: Water (activates enzymes, swells seed), Oxygen (for respiration), Suitable temperature (for enzyme activity). Light not needed initially.
b) Process: Seed absorbs water → seed coat splits → radicle (root) emerges → plumule (shoot) grows upward → cotyledons provide food → true leaves form → photosynthesis begins.
c) Seed dispersal (wind, water, animals, splitting) spreads seeds away from parent plant to reduce competition for light, water, nutrients, space.
End of Answer Key
Total: 100 marks (Section A: 56, Section B: 44)