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Primary 5 Science Practice Paper 3
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TuitionGoWhere Practice Paper - Science Primary 5 (Answer Key)
Subject: Science
Level: Primary 5
Paper: Practice Paper 3 (Version 3 of 5)
Total Marks: 100
Section A: Multiple-Choice Questions (56 marks)
1. Answer: (2) Chloroplast [2]
Explanation: Chloroplasts contain chlorophyll, the green pigment that traps light energy for photosynthesis. The nucleus controls cell activities, the vacuole stores substances, and the cell membrane controls movement of substances in and out of the cell.
2. Answer: (3) Mushroom – Non-flowering plant [2]
Explanation: Mushrooms are fungi, not plants. They do not photosynthesise and obtain nutrients through decomposition. Moss, fern, and algae are correctly classified as non-flowering plants.
3. Answer: (4) All stages [2]
Explanation: Water is required at all stages of a plant's life cycle: for seed germination (stage P), growth of seedling and adult plant, and for flowering/pollination (stage Q) and fertilisation processes.
4. Answer: (1) A [2]
Explanation: Mammals have hair, breathe through lungs, and feed their young with milk. Organism A has all three characteristics. Organism D lays eggs (monotreme exception, but not typical), B and C lack hair and milk-feeding.
5. Answer: (3) Yeast is a type of fungus used in bread-making. [2]
Explanation: Yeast is a beneficial fungus used in baking (produces CO₂ for rising) and brewing. Not all microorganisms are harmful (many are beneficial). Bacteria are generally smaller than fungi. Viruses cannot reproduce outside a host cell.
6. Answer: (3) The rabbit population will increase. [2]
Explanation: Grasshoppers and rabbits both feed on grass (competing primary consumers). If grasshoppers are removed, more grass is available for rabbits, so their population increases. Frogs eat grasshoppers, so frog population would decrease. Snakes eat frogs, so snake population would also decrease.
7. Answer: (4) D [2]
Explanation: The small intestine (D) is where most absorption of digested food occurs, due to its villi and microvilli that increase surface area. The stomach (C) mainly digests proteins, the oesophagus (B) transports food, and the mouth (A) begins mechanical and chemical digestion.
8. Answer: (1) Stone, Sponge, Water, Oxygen [2]
Explanation: Solids with definite shape = Stone (P). Solids without definite shape (compressible) = Sponge (Q). Liquids = Water (
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TuitionGoWhere Practice Paper - Science Primary 5 (Answer Key)
Paper: Practice Paper 3 (Version 3 of 5)
Subject: Science
Level: Primary 5
Total Marks: 100
Section A: Multiple-Choice Questions (56 marks)
| Question | Answer | Explanation |
|---|---|---|
| 1 | (2) Chloroplast | Chloroplasts contain chlorophyll which traps light energy for photosynthesis. |
| 2 | (3) Mushroom – Non-flowering plant | Mushrooms are fungi, not plants. They do not photosynthesise and belong to a separate kingdom. |
| 3 | (4) All stages | Water is required at all stages: germination (P), growth, flowering (Q), fertilisation, and seed development. |
| 4 | (1) A | Mammals have hair, breathe through lungs, and feed young with milk. Organism A has all three characteristics. |
| 5 | (3) Yeast is a type of fungus used in bread-making | Yeast is a unicellular fungus used in baking and brewing. Not all microorganisms are harmful; bacteria are smaller than fungi; viruses cannot reproduce outside a host. |
| 6 | (3) The rabbit population will increase | With grasshoppers gone, more grass is available for rabbits (less competition), so rabbit population increases. |
| 7 | (4) D (Small Intestine) | Most absorption of digested food occurs in the small intestine due to its large surface area (villi). |
| 8 | (1) P: Stone, Q: Sponge, R: Water, S: Oxygen | Solids with definite shape = stone (P); solids without definite shape = sponge (Q); liquids = water (R); gases = oxygen (S). |
| 9 | (3) C only | Kinetic energy of molecules increases with temperature. Beaker C (100°C) has the highest temperature. |
| 10 | (2) Evaporation | Evaporation occurs at any temperature below boiling point, at the liquid surface. |
| 11 | (2) A and B only | Evaporation (A) and transpiration (B) require heat from the Sun. Condensation (C) releases heat; precipitation (D) does not require solar heat directly. |
| 12 | (1) metal is a better conductor of heat than wood | Metal conducts heat away from the hand faster, making it feel colder. Both spoons are at room temperature. |
| 13 | (2) The bulbs will light up and the ammeter will show a reading | Closing the switch completes the series circuit. Current flows through bulbs and ammeter. |
| 14 | (3) Copper rod | Copper is an excellent conductor of electricity. Plastic, wood, and rubber are insulators. |
| 15 | (4) Replacing the iron nail with a copper nail | Copper is not ferromagnetic. Iron core concentrates magnetic field lines. More coils, thicker core, and more batteries increase strength. |
| 16 | (3) Microscopic fungi | Group X: Mould, Yeast, Penicillium (microscopic). Group Y: Mushroom, Bracket fungus, Toadstool (macroscopic). |
| 17 | (1) X: Produces pollen grains, Y: Receives pollen grains | Anther (X) produces pollen; Stigma (Y) receives pollen during pollination. |
| 18 | (1) Pollination → Fertilisation → Seed dispersal → Germination | Correct sequence of sexual reproduction in flowering plants. |
| 19 | (3) Alveoli | Gaseous exchange (oxygen and carbon dioxide) occurs at the alveoli (air sacs) due to thin walls and rich blood supply. |
| 20 | (2) Carbon dioxide is removed from the body during respiration | Exhaled air has more CO₂ (4%) than inhaled (0.04%). Oxygen decreases (21% → 16%). Nitrogen unchanged. Water vapour increases. |
| 21 | (4) Left ventricle | Left ventricle pumps oxygenated blood via the aorta to the body. Right side handles deoxygenated blood to lungs. |
| 22 | (2) xylem | Xylem transports water and mineral salts from roots to leaves. Phloem transports food. |
| 23 | (2) Food made by the leaves cannot reach the roots | Phloem transports food (sugar) from leaves to other parts. Ringing removes phloem, blocking food transport downwards. |
| 24 | (4) A, B, C and D | All are functions: protection (skull, ribs), support/shape, blood cell production (bone marrow), movement (levers for muscles). |
| 25 | (2) Second class lever | Wheelbarrow: Load (wheelbarrow contents) between Fulcrum (wheel) and Effort (handles). |
| 26 | (3) 20 N | Moment = Force × Distance. Clockwise moment = 10 N × 40 cm = 400 Ncm. Anticlockwise = F × 20 cm. For balance: F × 20 = 400 → F = 20 N. |
| 27 | (4) Gravitational potential energy → Kinetic energy → Sound energy + Heat energy | At top: max GPE. Falling: GPE → KE. Impact: KE → Sound + Heat. |
| 28 | (2) The shadow becomes larger and fuzzier | Moving object closer to light source increases shadow size (more light blocked) and penumbra (fuzzy edges). |
Section B: Open-Ended Questions (44 marks)
Question 29 (3 marks)
a) The cell wall gives the plant cell a fixed, regular shape and provides structural support. It prevents the cell from bursting when water enters by osmosis.
b) The chloroplast contains chlorophyll which traps light energy to make food (photosynthesis). Animal cells do not make their own food, so they do not need chloroplasts.
c) The large central vacuole stores water, minerals, and waste. It maintains turgor pressure to keep the plant firm and upright.
Question 30 (4 marks)
a) W: Pollination – transfer of pollen from anther to stigma.
b) X: Fertilisation – fusion of male nucleus (from pollen) with female nucleus (in ovule).
c) Y: Seed dispersal – scattering of seeds away from parent plant.
d) Z: Germination – seed develops into a seedling under suitable conditions (water, air, warmth).
Question 31 (3 marks)
a) Organism P is a decomposer (fungus/bacteria). It breaks down dead organisms and waste, returning nutrients to the environment for plants to reuse.
b) Without decomposers, dead matter would accumulate, nutrients would be locked up, and plants would lack essential minerals for growth. The nutrient cycle would be disrupted.
c) Energy flows one way (Sun → producers → consumers → heat loss) and is not recycled. Matter (carbon, nitrogen, water) cycles repeatedly through the ecosystem.
Question 32 (4 marks)
a) The small intestine has villi and microvilli which greatly increase the surface area for absorption of digested food into the bloodstream.
b) The large intestine absorbs water and mineral salts from undigested food, forming semi-solid faeces.
c) Digestion of carbohydrates starts in the mouth (salivary amylase), continues in the small intestine (pancreatic amylase, maltase, sucrase, lactase), producing glucose for absorption.
d) The liver produces bile (stored in gall bladder) which emulsifies fats into smaller droplets, increasing surface area for lipase action in the small intestine.
Question 33 (3 marks)
a) Evaporation occurs at any temperature, only at the liquid surface, and is a slow process. Boiling occurs at a fixed temperature (100°C for water), throughout the liquid, and is a rapid process.
b) Wind removes water vapour near the wet clothes, reducing humidity around them, which increases the rate of evaporation.
c) Spreading clothes out increases the exposed surface area, allowing more water molecules to escape at the same time, speeding up evaporation.
Question 34 (4 marks)
a) In a series circuit, there is only one path for current. If one bulb fuses (open circuit), current stops flowing and all bulbs go out.
b) In a parallel circuit, each bulb has its own path. If one bulb fuses, the other paths remain complete, so the other bulbs stay lit.
c) Parallel circuits allow appliances to be switched on/off independently. If one appliance fails, others are unaffected. Voltage across each appliance is the same (mains voltage).
d) The filament heats up due to electrical resistance, glowing white-hot to produce light. Most energy is converted to heat, making it inefficient.
Question 35 (3 marks)
a) Like poles repel (N-N or S-S), unlike poles attract (N-S).
b) Stroke the steel rod with one pole of a magnet in one direction repeatedly (e.g., 30 times). This aligns the magnetic domains in the steel, making it a permanent magnet.
c) Heating, hammering, or dropping the magnet randomly aligns the domains, weakening or destroying its magnetism.
Question 36 (4 marks)
a) Inhalation: Diaphragm contracts and flattens, rib cage moves up and out. Chest volume increases, pressure decreases, air rushes in.
b) Exhalation: Diaphragm relaxes and curves up, rib cage moves down and in. Chest volume decreases, pressure increases, air rushes out.
c) Alveoli have thin walls (one cell thick), are surrounded by capillaries, and have a large total surface area. This allows rapid diffusion of oxygen into blood and carbon dioxide out.
d) During exercise, muscle cells respire more to release energy. Breathing rate and depth increase to take in more oxygen and remove more carbon dioxide.
Question 37 (3 marks)
a) Xylem: Transports water and mineral salts from roots to leaves. Made of dead, hollow cells with thick lignified walls for support.
b) Phloem: Transports food (sugar) from leaves to all parts of the plant. Made of living cells (sieve tubes and companion cells).
c) Transpiration (water loss from leaves) creates a suction pull (transpiration pull) that draws water up the xylem. Cohesion between water molecules and adhesion to xylem walls maintain a continuous water column.
Question 38 (4 marks)
a) A lever is a rigid bar that pivots about a fixed point called the fulcrum. Effort is applied at one point to move a load at another point.
b) First class: Fulcrum between effort and load (e.g., seesaw, scissors). Second class: Load between fulcrum and effort (e.g., wheelbarrow, nutcracker). Third class: Effort between fulcrum and load (e.g., tweezers, fishing rod).
c) Mechanical Advantage = Load / Effort. For the lever shown: Load = 50 N, Effort = 20 N. MA = 50/20 = 2.5.
d) The lever allows a smaller effort to overcome a larger load, making work easier. However, the effort moves a greater distance than the load (trade-off).
Question 39 (3 marks)
a) Gravitational potential energy (at highest point) → Kinetic energy (falling) → Kinetic energy + Sound + Heat (on impact).
b) Some kinetic energy is converted to sound and heat energy upon impact with the ground. Energy is conserved but transformed into other forms.
c) On the Moon, gravitational pull is weaker (1/6 of Earth's). The ball would fall slower, have less kinetic energy on impact, and bounce higher due to lower gravity and no air resistance.
Question 40 (4 marks)
a) Light travels in straight lines. An opaque object blocks light, forming a dark shadow behind it.
b) When the object is moved closer to the light source, it blocks more light rays, so the shadow becomes larger. The penumbra (fuzzy edge) also increases.
c) A solar eclipse occurs when the Moon comes between the Sun and Earth, casting its shadow on Earth. The Moon blocks sunlight from reaching parts of Earth.
d) The Moon's shadow has a dark central umbra (total eclipse) and a lighter outer penumbra (partial eclipse). Observers in the umbra see a total eclipse; those in the penumbra see a partial eclipse.
Question 41 (3 marks)
a) Conduction: Transfer of heat through a material by vibration of particles (solids, especially metals). Convection: Transfer of heat by movement of fluid particles (liquids/gases). Radiation: Transfer of heat by electromagnetic waves (no medium needed, e.g., Sun to Earth).
b) The vacuum between the double walls prevents heat loss by conduction and convection (no particles). The shiny silvered surfaces reflect radiant heat back into the flask (reduces radiation).
c) The plastic stopper is an insulator, reducing heat loss by conduction through the neck.
Question 42 (3 marks)
a) A: Evaporation (driven by Sun's heat). B: Condensation (water vapour cools, forms clouds). C: Precipitation (rain falls). D: Collection/Runoff (water flows back to sea).
b) The water cycle ensures continuous supply of fresh water on land for plants and animals. It distributes water globally, shapes weather patterns, and supports all life.
c) Deforestation reduces transpiration, leading to less cloud formation and rainfall. Soil erosion occurs, and water runs off quickly instead of soaking in, disrupting the local water cycle.
Marking Scheme Summary
| Section | Questions | Marks per Question | Total Marks |
|---|---|---|---|
| A (MCQ) | 1–28 | 2 | 56 |
| B (Open-Ended) | 29–42 | 3–4 | 44 |
| Total | 100 |
End of Answer Key