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Secondary 1 Science Scientific Inquiry Quiz
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Questions
Secondary 1 Science Quiz - Scientific Inquiry
Name: ___________________________
Class: ___________________________
Date: ___________________________
Score: ______ / 40
Duration: 45 minutes
Total Marks: 40
Instructions:
- Answer all questions in the spaces provided.
- Show all working for calculation questions.
- Diagrams are not drawn to scale unless stated.
- Use a pencil for diagrams and graphs.
Section A: Multiple Choice Questions (10 marks)
Questions 1 to 10 carry 1 mark each. Choose the correct answer and write its letter (A, B, C, or D) in the box provided.
1. A student measures the length of a metal rod three times using a ruler. The readings are 12.3 cm, 12.5 cm, and 12.4 cm. The actual length of the rod is 12.4 cm. Which statement best describes the measurements?
| A. Accurate but not precise | B. Precise but not accurate | | C. Both accurate and precise | D. Neither accurate nor precise |
Answer: □
2. In an experiment to investigate the effect of temperature on the rate of dissolving sugar, which variable is the independent variable?
| A. Mass of sugar dissolved | B. Temperature of water | | C. Volume of water used | D. Time taken to dissolve |
Answer: □
3. A student uses a measuring cylinder to measure 25 cm³ of water. The bottom of the meniscus is at the 25 cm³ mark, but the student reads the top of the meniscus. What type of error is this?
| A. Zero error | B. Parallax error | | C. Random error | D. Systematic error |
Answer: □
4. Which of the following shows the correct order of steps in the scientific method?
| A. Hypothesis → Observation → Experiment → Conclusion | | B. Observation → Hypothesis → Experiment → Conclusion | | C. Experiment → Observation → Hypothesis → Conclusion | | D. Conclusion → Experiment → Hypothesis → Observation |
Answer: □
5. A student records the time for a pendulum to complete 20 oscillations as 32.4 s, 32.6 s, and 32.5 s. What is the average time for one oscillation?
| A. 1.62 s | B. 1.63 s | | C. 32.5 s | D. 32.5 s |
Answer: □
6. In a fair test investigating how the surface area of a parachute affects the time taken to fall, which variable must be kept constant?
| A. Surface area of parachute | B. Time taken to fall | | C. Mass of the load attached | D. Height of drop |
Answer: □
7. A digital balance shows a reading of 0.5 g when nothing is placed on it. All subsequent measurements will be affected by this. What type of error is this?
| A. Random error | B. Parallax error | | C. Zero error | D. Human error |
Answer: □
8. Which piece of apparatus is most suitable for measuring exactly 25.0 cm³ of a liquid?
| A. Beaker | B. Measuring cylinder | | C. Pipette | D. Burette |
Answer: □
9. A student plots a graph of extension of a spring against force applied. The graph is a straight line passing through the origin. What conclusion can be drawn?
| A. Extension is inversely proportional to force | | B. Extension is directly proportional to force | | C. The spring is damaged | | D. There is a systematic error in the measurements |
Answer: □
10. When writing a hypothesis for an experiment, it should be:
| A. A question that cannot be tested | | B. A testable prediction based on scientific reasoning | | C. A statement of fact that is already proven | | D. A guess without any scientific basis |
Answer: □
Section B: Structured Questions (18 marks)
Answer all questions in the spaces provided.
11. A group of students wants to investigate how the concentration of salt solution affects the mass of potato strips after soaking for 30 minutes.
(a) State a suitable hypothesis for this investigation.
[1]
(b) Identify the independent variable and the dependent variable.
[2]
Independent variable: ________________________________________________________
Dependent variable: _________________________________________________________
(c) State two variables that must be kept constant to ensure a fair test.
[2]
(d) The students use a digital balance to measure the mass of potato strips before and after soaking. The balance shows a zero error of +0.02 g. If the initial reading for a potato strip is 5.42 g, what is the actual mass of the potato strip?
[1]
Actual mass = _______________ g
12. In an experiment to measure the density of a small irregular stone, a student uses the displacement method.
(a) Name the apparatus used to measure the volume of the stone by displacement.
[1]
(b) The student records the following readings:
- Initial volume of water in measuring cylinder = 50 cm³
- Volume of water + stone = 68 cm³
- Mass of stone = 54 g
Calculate the density of the stone. Give your answer in g/cm³.
[2]
Density = _______________ g/cm³
(c) State one precaution the student should take when reading the volume of water in the measuring cylinder to avoid parallax error.
[1]
13. A student investigates the relationship between the length of a pendulum and its period (time for one complete oscillation). The table shows the results.
| Length of pendulum / cm | Time for 20 oscillations / s | Period / s |
|---|---|---|
| 20 | 18.0 | 0.90 |
| 40 | 25.5 | 1.28 |
| 60 | 31.2 | 1.56 |
| 80 | 36.0 | 1.80 |
| 100 | 40.2 | 2.01 |
(a) Complete the table by calculating the period for the 40 cm and 100 cm lengths.
[2]
(b) Plot a graph of period (y-axis) against length (x-axis) on the grid below.
[3]
<image_placeholder> id: Q13-fig1 type: graph linked_question: Q13 description: Graph paper grid for plotting period vs length of pendulum. x-axis: Length of pendulum / cm (0 to 110 cm, scale 1 cm = 10 cm). y-axis: Period / s (0 to 2.2 s, scale 1 cm = 0.2 s). Points to plot: (20, 0.90), (40, 1.28), (60, 1.56), (80, 1.80), (100, 2.01). Draw a smooth curve of best fit. labels: x-axis: Length of pendulum / cm; y-axis: Period / s; Title: Graph of Period against Length of Pendulum values: Points: (20, 0.90), (40, 1.28), (60, 1.56), (80, 1.80), (100, 2.01) must_show: Labeled axes with correct scales, plotted points, smooth curve of best fit passing through or near all points </image_placeholder>
(c) Use your graph to estimate the period of a pendulum of length 50 cm.
[1]
Period = _______________ s
(d) State the relationship between the period of a pendulum and its length based on the graph.
[1]
14. A student measures the diameter of a metal wire using a micrometer screw gauge. The diagram shows the reading.
<image_placeholder> id: Q14-fig1 type: diagram linked_question: Q14 description: Micrometer screw gauge reading showing sleeve scale and thimble scale. Sleeve shows 5.5 mm (5 mm line visible, half mm line visible). Thimble shows 28 divisions (0.28 mm). Zero error: +0.02 mm (zero mark on thimble is 2 divisions above reference line when jaws closed). labels: Sleeve reading: 5.5 mm; Thimble reading: 0.28 mm; Zero error: +0.02 mm values: Sleeve = 5.5 mm, Thimble = 0.28 mm, Zero error = +0.02 mm must_show: Clear micrometer diagram with sleeve and thimble scales visible, zero error indication </image_placeholder>
(a) State the main scale reading and the thimble scale reading.
[2]
Main scale reading = _______________ mm
Thimble scale reading = _______________ mm
(b) Calculate the observed reading.
[1]
Observed reading = _______________ mm
(c) Determine the corrected diameter of the wire, accounting for the zero error.
[1]
Corrected diameter = _______________ mm
Section C: Data Analysis and Experimental Design (12 marks)
15. A student conducts an experiment to find out how the angle of a ramp affects the speed of a toy car at the bottom. The height of the ramp is kept constant at 30 cm. The student measures the time taken for the car to travel 100 cm along the floor after leaving the ramp.
The results are shown below.
| Angle of ramp / ° | Time for 100 cm / s | Speed / cm/s |
|---|---|---|
| 10 | 4.2 | 23.8 |
| 20 | 3.0 | 33.3 |
| 30 | 2.4 | 41.7 |
| 40 | 2.1 | 47.6 |
| 50 | 2.0 | 50.0 |
(a) Calculate the speed for the 10° angle and verify the value in the table.
[1]
(b) Plot a graph of speed (y-axis) against angle of ramp (x-axis).
[3]
<image_placeholder> id: Q15-fig1 type: graph linked_question: Q15 description: Graph paper grid for plotting speed vs angle of ramp. x-axis: Angle of ramp / ° (0 to 60°, scale 1 cm = 5°). y-axis: Speed / cm/s (0 to 55 cm/s, scale 1 cm = 5 cm/s). Points to plot: (10, 23.8), (20, 33.3), (30, 41.7), (40, 47.6), (50, 50.0). Draw a smooth curve of best fit. labels: x-axis: Angle of ramp / °; y-axis: Speed / cm/s; Title: Graph of Speed against Angle of Ramp values: Points: (10, 23.8), (20, 33.3), (30, 41.7), (40, 47.6), (50, 50.0) must_show: Labeled axes with correct scales, plotted points, smooth curve of best fit </image_placeholder>
(c) Describe the relationship between the angle of the ramp and the speed of the car.
[1]
(d) The student concludes: "Increasing the angle of the ramp increases the speed of the car because the gravitational potential energy is converted to kinetic energy more quickly." Evaluate this conclusion.
[2]
(e) Suggest one improvement to the experiment to obtain more reliable results.
[1]
16. A student wants to investigate the effect of light intensity on the rate of photosynthesis in aquatic plants. The student uses a lamp at different distances from a beaker containing pondweed and counts the number of bubbles produced per minute.
(a) State a suitable hypothesis for this investigation.
[1]
(b) Identify the independent variable, dependent variable, and one controlled variable.
[3]
Independent variable: ________________________________________________________
Dependent variable: _________________________________________________________
Controlled variable: ________________________________________________________
(c) The student places the lamp at 10 cm, 20 cm, 30 cm, 40 cm, and 50 cm from the beaker. Explain why using distance from the lamp is a suitable way to vary light intensity.
[1]
(d) The student counts bubbles for 1 minute at each distance. Suggest one reason why counting bubbles for a longer time (e.g., 5 minutes) would improve the reliability of the results.
[1]
(e) State one safety precaution the student should take when using a lamp near water.
[1]
17. The diagram shows an experiment to investigate the conditions needed for rusting. Three test tubes are set up as shown.
<image_placeholder> id: Q17-fig1 type: experimental_setup linked_question: Q17 description: Three test tubes labeled A, B, C. Test tube A: Iron nail in tap water (air present). Test tube B: Iron nail in boiled water with layer of oil on top (no air). Test tube C: Iron nail in anhydrous calcium chloride (dry air, no water). All test tubes stoppered. labels: Test tube A: Iron nail + tap water; Test tube B: Iron nail + boiled water + oil layer; Test tube C: Iron nail + anhydrous calcium chloride values: N/A must_show: Three test tubes with clear labels showing contents, iron nail in each, stoppers, oil layer in B </image_placeholder>
(a) In which test tube(s) will rusting occur?
[1]
(b) Explain why rusting does not occur in test tube B.
[1]
(c) Explain why rusting does not occur in test tube C.
[1]
(d) State the two conditions necessary for rusting based on this experiment.
[1]
(e) This experiment is an example of a controlled experiment. Explain what is meant by a controlled experiment.
[1]
18. A student measures the temperature of hot water cooling in a beaker over time. The data is shown below.
| Time / min | Temperature / °C |
|---|---|
| 0 | 80 |
| 2 | 68 |
| 4 | 59 |
| 6 | 52 |
| 8 | 47 |
| 10 | 43 |
(a) Plot a graph of temperature (y-axis) against time (x-axis).
[3]
<image_placeholder> id: Q18-fig1 type: graph linked_question: Q18 description: Graph paper grid for plotting temperature vs time. x-axis: Time / min (0 to 12 min, scale 1 cm = 1 min). y-axis: Temperature / °C (40 to 85 °C, scale 1 cm = 5 °C). Points to plot: (0, 80), (2, 68), (4, 59), (6, 52), (8, 47), (10, 43). Draw a smooth curve of best fit. labels: x-axis: Time / min; y-axis: Temperature / °C; Title: Cooling Curve of Hot Water values: Points: (0, 80), (2, 68), (4, 59), (6, 52), (8, 47), (10, 43) must_show: Labeled axes with correct scales, plotted points, smooth curve of best fit </image_placeholder>
(b) Use your graph to estimate the temperature of the water after 5 minutes.
[1]
Temperature = _______________ °C
(c) Describe how the rate of cooling changes with time.
[1]
(d) The student repeats the experiment with a lid on the beaker. Sketch on the same graph (using a dashed line) the expected cooling curve and explain the difference.
[2]
19. A student is given an unknown white powder and is told it is either salt (sodium chloride) or sugar (sucrose). The student has access to basic laboratory apparatus.
(a) Design a simple experiment to distinguish between salt and sugar based on their physical properties. Include the steps, observations, and conclusion.
[4]
(b) State one safety precaution for your experiment.
[1]
20. In a science fair project, a student claims: "Plants grow better with music because the sound waves stimulate growth."
(a) Identify two flaws in this claim as a scientific hypothesis.
[2]
(b) Rewrite the claim as a testable hypothesis.
[1]
(c) Outline an experimental design to test your hypothesis. Include the independent variable, dependent variable, two controlled variables, and a brief procedure.
[4]
End of Quiz
Answers
Secondary 1 Science Quiz - Scientific Inquiry (Answer Key)
Total Marks: 40
Section A: Multiple Choice Questions (10 marks)
1. Answer: C
Explanation: The readings (12.3, 12.5, 12.4) are close to each other (precise) and their average (12.4) matches the actual value (accurate).
Marking: 1 mark for correct choice.
2. Answer: B
Explanation: The independent variable is the one deliberately changed by the experimenter. Here, temperature of water is changed to see its effect on dissolving rate.
Marking: 1 mark for correct choice.
3. Answer: B
Explanation: Parallax error occurs when the eye is not perpendicular to the scale, causing a reading from the wrong position (top vs bottom of meniscus).
Marking: 1 mark for correct choice.
4. Answer: B
Explanation: The scientific method follows: Observation → Question → Hypothesis → Experiment → Analysis → Conclusion.
Marking: 1 mark for correct choice.
5. Answer: B
Explanation: Average time for 20 oscillations = (32.4 + 32.6 + 32.5) / 3 = 32.5 s. Period = 32.5 / 20 = 1.625 s ≈ 1.63 s (to 3 significant figures).
Marking: 1 mark for correct choice.
6. Answer: C
Explanation: In a fair test, only the independent variable (surface area) and dependent variable (time) change. Mass of load must be constant. Height of drop is also a controlled variable, but mass is the better answer as it directly affects the force/terminal velocity.
Marking: 1 mark for correct choice.
7. Answer: C
Explanation: Zero error is a systematic error where the instrument gives a non-zero reading when the true value is zero.
Marking: 1 mark for correct choice.
8. Answer: C
Explanation: A pipette is designed to deliver a single, fixed volume (e.g., 25.0 cm³) with high accuracy. Burettes are for variable volumes; measuring cylinders and beakers are less precise.
Marking: 1 mark for correct choice.
9. Answer: B
Explanation: A straight line through the origin indicates direct proportionality (y = kx). Hooke's Law states extension ∝ force.
Marking: 1 mark for correct choice.
10. Answer: B
Explanation: A hypothesis must be a testable prediction based on scientific knowledge, not a guess or untestable question.
Marking: 1 mark for correct choice.
Section B: Structured Questions (18 marks)
11. (a) [1 mark]
Answer: As the concentration of salt solution increases, the mass of the potato strip decreases (or: The higher the salt concentration, the greater the loss in mass of the potato strip).
Marking: 1 mark for a testable hypothesis linking concentration to mass change with direction.
11. (b) [2 marks]
Answer:
Independent variable: Concentration of salt solution
Dependent variable: Mass of potato strip (or change in mass)
Marking: 1 mark each. Must identify correctly.
11. (c) [2 marks]
Answer: Any two of:
- Volume of salt solution
- Temperature of solution
- Time of soaking (30 minutes)
- Size/type of potato strips (same potato, same dimensions)
- Surface area of potato strips
Marking: 1 mark each for valid controlled variables.
11. (d) [1 mark]
Answer: Actual mass = Reading − Zero error = 5.42 g − 0.02 g = 5.40 g
Marking: 1 mark for correct calculation and unit.
12. (a) [1 mark]
Answer: Measuring cylinder (or displacement can / graduated cylinder)
Marking: 1 mark for correct apparatus.
12. (b) [2 marks]
Answer:
Volume of stone = 68 cm³ − 50 cm³ = 18 cm³
Density = Mass / Volume = 54 g / 18 cm³ = 3.0 g/cm³
Marking: 1 mark for correct volume calculation; 1 mark for correct density with unit.
12. (c) [1 mark]
Answer: Position the eye perpendicular to the water surface (at the same level as the bottom of the meniscus) when taking the reading.
Marking: 1 mark for correct precaution.
13. (a) [2 marks]
Answer:
For 40 cm: Period = 25.5 / 20 = 1.275 s ≈ 1.28 s
For 100 cm: Period = 40.2 / 20 = 2.01 s
Marking: 1 mark each for correct calculation.
13. (b) [3 marks]
Answer: Graph should show:
- Axes labeled with units: x-axis "Length of pendulum / cm", y-axis "Period / s" [1 mark]
- Suitable scales covering data range [1 mark]
- All 5 points plotted correctly [1 mark]
- Smooth curve of best fit [1 mark]
Total 3 marks (scale: 1 mark for axes+scales, 1 mark for points, 1 mark for curve)
Note: The image placeholder shows expected graph features.
13. (c) [1 mark]
Answer: From graph, at 50 cm length, period ≈ 1.42 s (accept 1.40–1.44 s)
Marking: 1 mark for correct reading from graph within tolerance.
13. (d) [1 mark]
Answer: The period increases as the length increases, but not linearly (the relationship is T ∝ √L, so the graph curves upward with decreasing gradient).
Marking: 1 mark for describing the trend correctly.
14. (a) [2 marks]
Answer:
Main scale reading = 5.5 mm
Thimble scale reading = 0.28 mm
Marking: 1 mark each.
14. (b) [1 mark]
Answer: Observed reading = 5.5 + 0.28 = 5.78 mm
Marking: 1 mark for correct addition.
14. (c) [1 mark]
Answer: Corrected diameter = Observed reading − Zero error = 5.78 mm − 0.02 mm = 5.76 mm
Marking: 1 mark for correct subtraction and unit.
Section C: Data Analysis and Experimental Design (12 marks)
15. (a) [1 mark]
Answer: Speed = Distance / Time = 100 cm / 4.2 s = 23.8 cm/s (to 3 significant figures). Matches table.
Marking: 1 mark for correct calculation.
15. (b) [3 marks]
Answer: Graph should show:
- Axes labeled with units: x-axis "Angle of ramp / °", y-axis "Speed / cm/s" [1 mark]
- Suitable scales [1 mark]
- All 5 points plotted correctly [1 mark]
- Smooth curve of best fit [1 mark]
Total 3 marks (similar marking to Q13b)
15. (c) [1 mark]
Answer: As the angle of the ramp increases, the speed of the car increases, but the rate of increase decreases (graph curves and levels off).
Marking: 1 mark for correct description.
15. (d) [2 marks]
Answer: The conclusion is partially correct but incomplete.
- Correct: GPE is converted to KE as the car moves down the ramp.
- Flaw: The height is constant (30 cm), so the initial GPE is the same for all angles. The speed difference is due to the component of gravity along the ramp (steeper = greater acceleration), not because GPE is converted "more quickly." Also, friction and air resistance affect final speed.
Marking: 1 mark for identifying a correct aspect; 1 mark for identifying a flaw/limitation.
15. (e) [1 mark]
Answer: Repeat each angle multiple times (e.g., 3 trials) and calculate the average time/speed to reduce random errors.
Marking: 1 mark for valid improvement (repetition, averaging, or using light gates for timing).
16. (a) [1 mark]
Answer: As the light intensity increases (or distance from lamp decreases), the rate of photosynthesis (number of bubbles per minute) increases.
Marking: 1 mark for testable hypothesis with direction.
16. (b) [3 marks]
Answer:
Independent variable: Distance of lamp from beaker (or light intensity)
Dependent variable: Number of bubbles produced per minute (rate of photosynthesis)
Controlled variable: Any one of: type/size of pondweed, volume of water, temperature, concentration of CO₂ (e.g., add NaHCO₃), time of counting
Marking: 1 mark each.
16. (c) [1 mark]
Answer: Light intensity is inversely proportional to the square of the distance from a point source (I ∝ 1/d²). Changing distance systematically varies light intensity.
Marking: 1 mark for correct explanation.
16. (d) [1 mark]
Answer: Counting for a longer time reduces the effect of random fluctuations in bubble production and gives a more representative average rate.
Marking: 1 mark for valid reason.
16. (e) [1 mark]
Answer: Keep electrical components (lamp, power supply) away from water to prevent electric shock; ensure hands are dry when handling electrical equipment.
Marking: 1 mark for relevant safety precaution.
17. (a) [1 mark]
Answer: Test tube A only.
Marking: 1 mark.
17. (b) [1 mark]
Answer: The layer of oil prevents air (oxygen) from dissolving in the water, so there is no oxygen for rusting.
Marking: 1 mark for explaining absence of oxygen.
17. (c) [1 mark]
Answer: Anhydrous calcium chloride absorbs water vapour, so the air in the test tube is dry (no water/moisture).
Marking: 1 mark for explaining absence of water.
17. (d) [1 mark]
Answer: Presence of both oxygen (air) and water (moisture).
Marking: 1 mark for both conditions.
17. (e) [1 mark]
Answer: A controlled experiment is one where only the independent variable is changed, the dependent variable is measured, and all other variables are kept constant (controlled) to ensure a fair test.
Marking: 1 mark for correct definition.
18. (a) [3 marks]
Answer: Graph should show:
- Axes labeled with units: x-axis "Time / min", y-axis "Temperature / °C" [1 mark]
- Suitable scales [1 mark]
- All 6 points plotted correctly [1 mark]
- Smooth curve of best fit (decreasing curve, steepest at start) [1 mark]
Total 3 marks.
18. (b) [1 mark]
Answer: From graph, at 5 min, temperature ≈ 55 °C (accept 54–56 °C).
Marking: 1 mark for correct reading within tolerance.
18. (c) [1 mark]
Answer: The rate of cooling is fastest at the beginning (steepest gradient) and decreases over time (gradient becomes less steep) as the temperature difference between water and surroundings decreases.
Marking: 1 mark for correct description.
18. (d) [2 marks]
Answer:
- Sketch: Dashed curve starting at same point (0, 80) but above the original curve (cools slower), with smaller gradient throughout. [1 mark]
- Explanation: The lid reduces heat loss by convection and evaporation, so the water cools more slowly. [1 mark]
Marking: 1 mark for sketch showing correct trend; 1 mark for explanation.
19. (a) [4 marks]
Answer:
Experiment: Test electrical conductivity of aqueous solutions.
Steps:
- Dissolve separate samples of the unknown powder in equal volumes of distilled water in two beakers.
- Set up a simple circuit with a battery, bulb/LED, and two electrodes (or use a conductivity tester).
- Dip electrodes into each solution and observe if the bulb lights up.
Observations:
- If the bulb lights up (conducts electricity) → the powder is salt (NaCl, ionic, conducts in solution).
- If the bulb does not light up (does not conduct) → the powder is sugar (covalent, does not conduct in solution).
Conclusion: The powder is identified based on conductivity of its aqueous solution.
Alternative valid experiment: Heating test (sugar caramelizes/burns with sweet smell; salt does not melt/decompose at Bunsen burner temp) or taste test (NOT recommended for safety).
Marking: 1 mark for valid method; 1 mark for clear steps; 1 mark for expected observations for both substances; 1 mark for conclusion.
19. (b) [1 mark]
Answer: Do not taste any chemicals in the laboratory; wear safety goggles when heating substances.
Marking: 1 mark for relevant precaution.
20. (a) [2 marks]
Answer:
- Not testable as stated — "better" is subjective (height? mass? leaf number?) and "music" is not defined (type, volume, duration).
- No control group mentioned; correlation does not imply causation — other variables (light, water, soil) may differ.
Marking: 1 mark each for valid flaws (vague terms, not testable, no control, confounding variables).
20. (b) [1 mark]
Answer: "Plants exposed to classical music for 3 hours daily will grow taller (greater stem height) after 2 weeks compared to plants not exposed to music, when all other conditions (light, water, soil, temperature) are kept the same."
Marking: 1 mark for testable hypothesis with clear IV, DV, and controlled conditions.
20. (c) [4 marks]
Answer:
Independent variable: Presence/absence of music (or type/duration of music)
Dependent variable: Plant height (or mass, leaf number) after 2 weeks
Controlled variables (any two): Species/age of plants, pot size, soil type/volume, light intensity/duration, water volume/frequency, temperature, humidity
Procedure:
- Obtain 20 identical young plants (same species, similar height).
- Randomly divide into two groups of 10: Group A (music), Group B (no music, control).
- Place both groups in identical conditions (same light, water, soil, temperature).
- Expose Group A to classical music at 60 dB for 3 hours daily using a speaker. Group B experiences silence (or ambient noise only).
- Measure and record height of each plant every 2 days for 2 weeks.
- Calculate average final height for each group and compare.
Marking: 1 mark for IV; 1 mark for DV; 1 mark for two controlled variables; 1 mark for clear, logical procedure with replication (multiple plants per group).
End of Answer Key