Part A uses illustrative records to prepare for measurement. Part B is a separate actual 14-day investigation, not a claim that it has happened. Start Part B only with the listed supplies already available and adult permission. Otherwise record NOT_STARTED. A taller seedling is not necessarily healthier. Light, temperature, moisture, air movement and individual plant differences can affect results. One pair of plants cannot prove a general light-only cause. Plant care takes priority over keeping a test unchanged. Safety: Adult approval and supervision are required. Use known safe existing seedlings and follow instrument instructions. Use indoor locations only. No Sun viewing, unknown soil collection, darkness treatment, harsh heat, chemicals or water deprivation. Keep water away from electrical equipment. Wash hands after plant or soil contact. Stop for wilting or other welfare concerns. Stop: Stop Part A after its graph and plan if practical supplies or adult care are unavailable. Stop Part B at day 14 or immediately for wilting, mould, pests, heat, spills or unsafe equipment. Restore normal plant care and record STOPPED_EARLY. Never withhold needed water, buy instruments, stress plants or continue for a complete-looking log.

Materials: Paper, pencil and ruler marked in centimetres; For Part B only: existing thermometer (°C), light meter (lux), soil-moisture probe with stated units and anemometer (m/s); For Part B only: two existing healthy seedlings of the same type and similar starting size, with matching pots, soil amounts and drainage; For Part B only: existing marked water container (mL), water, spill trays and two adult-approved indoor plant locations; Adult who can supervise instruments and check plant welfare each day; no purchase is required 1. Part A: copy this illustrative site table. Columns: site, air temperature (°C), light (lux), soil moisture (% by volume), wind (m/s). A: 22, 12000, 18, 1. B: 18, 2000, 30, 0.2. Circle every differing condition. These are supplied values, not your measurements. 2. Plan a light comparison using the same seedling type and similar starting size, matching pots, soil and drainage. Plan the same water amount and schedule, measurement method and observation dates. Explain why temperature and moisture also need checking. 3. Graph these illustrative group-mean heights (cm): day 0, bright 4/shade 4; day 7, bright 6/shade 7; day 14, bright 8/shade 10. Label day and mean height (cm). Explain why taller does not prove healthier. Keep this supplied-data graph separate from Part B. 4. Part B: start only if all practical supplies and daily adult care are available. Otherwise write Practical investigation: NOT_STARTED and finish Part A only. The adult selects two safe existing indoor plant locations, A and B, in one room. Use brighter indirect light and moderate shade, not darkness or hot direct sunlight. 5. Label the seedlings A1 and B1. Put one at each location. Write the normal-care water amount (mL) and watering schedule before starting. Keep that amount, schedule, pots, soil and measuring method the same. Record every actual watering date and amount, including days without measurements. Measure height from soil level to the highest growing point without stretching. Record starting height (cm), leaf colour, alive/dead and departures from the plan. 6. Record a date and time. At both locations take actual readings of light (lux), air temperature (°C), pot-soil moisture and air movement (m/s). Follow each instrument's instructions. Write the moisture probe's own units; do not invent a percentage conversion. Mark any missing reading NOT_MEASURED. Do not copy the illustrative numbers into this log. 7. Collect one row per plant on days 0, 3, 7, 10 and 14 at the same clock time. Use the setup readings for day 0, not a second independent sample. Use this log: date | day | time | site | plant ID | light (lux) | air (°C) | moisture (device units) | wind (m/s) | height (cm) | water (mL) | leaf colour | alive/dead | deviations. Leave missed observations blank and label NOT_MEASURED. The adult checks welfare every day. 8. At day 14, graph the actual heights with day and height (cm) axes and separate A1/B1 lines. Leave missing points marked rather than invented. Compare growth and survival using your records. Explain any temperature, moisture, care or starting-plant differences. If stopped early, keep the partial record and write STOPPED_EARLY with the date and reason. Do not claim a completed two-week test. Done: Part A ends with the labelled illustrative graph and fair-test plan. Practical completion requires actual measurements at both sites, the dated two-week log, an actual-height graph and a bounded explanation. NOT_STARTED, missing readings and STOPPED_EARLY remain incomplete practical outcomes. Proof: Keep Part A labelled illustrative. For Part B retain actual readings, units, plant ID, dates, controls, height graph and survival observations. Record NOT_STARTED, NOT_MEASURED or STOPPED_EARLY where applicable. Note adult setup, readings, plotting and care; do not replace missing observations. Stop: Stop Part A after its graph and plan if practical supplies or adult care are unavailable. Stop Part B at day 14 or immediately for wilting, mould, pests, heat, spills or unsafe equipment. Restore normal plant care and record STOPPED_EARLY. Never withhold needed water, buy instruments, stress plants or continue for a complete-looking log.