A major limitation in the use of the potometer for measuring the rate of transpiration is that
it is made of breakable glass materials
it measures the rate of water intake
it measure the rate of water loss throuh the stern only
the movement of the air buble in the potometer cannot be timed accurately
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The correct ans is B.
Because it only measures the rate of water up take, and do not measure directly the transpiration rate or water loss. Hence part of the water taken up might not be completely lost through transpiration, some may be lost through photosynthesis therefore limiting the function of a photometer.
A major limitation in the use of the potometer for measuring the rate of transpiration is that it actually measures the rate of water uptake by the plant shoot, which is only an indirect measure of transpiration.
Here's why this is a significant limitation:
* Water uptake doesn't always perfectly equal transpiration: While transpiration creates a pull that drives water uptake, several other factors can influence how much water a plant absorbs. These include:
* Water used for other metabolic processes: A small portion of the absorbed water is used in photosynthesis and other metabolic activities within the plant.
* Water stored in plant tissues: Some absorbed water might be temporarily stored in the plant's cells and vacuoles rather than immediately lost through transpiration.
* Leakage or air bubbles in the apparatus: These can lead to inaccurate measurements of water uptake that don't reflect the plant's actual water loss.
* Cut ends and artificial conditions: The cut end of the stem is an artificial condition that doesn't exist in an intact plant in its natural environment. This can affect the rate of water uptake.
Therefore, while the potometer provides a useful estimate of the rate of transpiration under specific experimental conditions, it's crucial to remember that it's a measurement of water uptake and not a direct measurement of water vapor loss from the leaves. This distinction is important when interpreting the results.
The major limitation in the use of the potometer for measuring the rate of transpiration is that it measures the rate of water intake, not just the water lost through transpiration123456. This is because not all the water taken up by the plant is used for transpiration. Some of it might be used for photosynthesis or by the cells to maintain turgidity123456. So, the correct answer is B. it measures the rate of water intake.
A major limitation in the use of the potometer for measuring the rate of transpiration is that it **measures the rate of water intake**, not just the water lost through transpiration. This is because not all the water taken up by the plant is used for transpiration. Some of it might be used for photosynthesis or by the cells to maintain turgidity. So, the correct answer is B. It measures the rate of water intake.
It measures the rate of water intake.
Option B
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