This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.
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Here are the answers to your questions: 6.1. The name of this apparatus is a potometer. 6.2. a) Dependent variable: Transpiration rate (measured by the speed of movement of the air bubble). b) Independent variable: Temperature. 6.3. The speed of movement of the air bubble would decrease significantly or stop. Vaseline would block the stomata on the ventral (underside) surfaces of the leaves, preventing water vapor from escaping. This reduces the rate of transpiration, and thus the rate of water uptake by the plant. 6.4. The apparatus should be allowed to stand before starting the experiment to allow the plant shoot to acclimatize to the experimental conditions and to ensure that a steady rate of water uptake (transpiration) is established. It also allows for checking any leaks in the setup. 6.5. ONE precaution: Ensure that the entire apparatus is airtight to prevent any water leakage or entry of air bubbles other than the one being measured. (Alternatively: Cut the plant shoot under water to prevent air from entering the xylem vessels). 6.6. This is an instruction to study the table, not a question to be answered. 6.7. To illustrate the results, a line graph should be drawn with: X-axis*: Temperature (°C) Y-axis*: Transpiration rate (mol/m² sec) Plot the given points: (22, 1.5), (25, 3.5), (27, 5), (28, 4.5), (30, 4). Connect these points with a line. The graph would show an initial increase in transpiration rate, reaching a peak, and then a decrease. 6.8. Based on the results, the transpiration rate increases as temperature rises from 22°C to 27°C, reaching an optimum rate at 27°C. However, as the temperature continues to increase beyond 27°C (e.g., to 28°C and 30°C), the transpiration rate starts to decrease. This suggests that while higher temperatures generally increase transpiration, there is an optimal temperature, and beyond that, other factors (like stomatal closure to prevent excessive water loss) might cause the rate to decline. Send me the next one 📸