Sprint 5.1: Hypothesis And Experiment

In an experiment, a student exposes identical bean plants to red, blue, or green light and measures their height after two weeks to evaluate growth. The variable the student intentionally manipulates is the light colour, which is identified as the . This is because it is the primary condition established by the researcher to observe its effects. In a second scenario, a student dissolves sugar in water heated to 20°C, 40°C, and 60°C to analyse how temperature affects solubility. The amount of sugar that successfully dissolves is measured as the final outcome, making it the . This is because its value depends entirely on the condition altered during the procedure. To ensure scientific validity in this second scenario, the initial volume of water must remain exactly the same, acting as a . This is because allowing other factors to fluctuate would compromise the reliability of the entire investigation.

Before conducting the experiment on plant growth, we formulated a clear stating that sunlight increases the rate of photosynthesis. To ensure the reliability of our measurements and minimize random errors, we conducted three independent for each temperature setting. We maintained a setup in complete darkness to establish a baseline for comparing the oxygen production of the other plants. For the microscopic observation, a small of the onion peel was carefully placed on the glass slide and stained with iodine. Accurately documenting these procedures is essential so that other students can replicate our methodology and verify our .