Measuring Water Uptake Flashcards

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  • Make sure you understand the information on each card. If something’s unclear, click the link to the revision notes at the bottom of the page for more details.

2️⃣ Test yourself:

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3️⃣ Consistently Review and Practice:

  • Use spaced repetition: spend more time on the cards you struggle with and go over them more often.
  • Regularly review all the flashcards to help you better understand and retain the information over time.

Note: We may include questions that have multiple correct answers. It’s useful to remember specific examples to understand these concepts better.

What does a potometer measure?

A potometer measures the rate of water uptake by a leafy shoot, which can be used to observe the rate of transpiration.

Why is it important to cut the plant shoot underwater when setting up a potometer?

Cutting the plant shoot underwater ensures that the xylem remains filled with water and prevents air bubbles from entering.

How do you create an air bubble in the capillary tube of a potometer?

Remove the capillary tube from the beaker of water so that one air bubble forms, then place the tube back in the water.

How can you calculate the rate of transpiration using a potometer?

Measure the distance the air bubble travels over a set period of time and divide the distance by the time to calculate the rate (e.g., cm/min).

What should you do when setting up a potometer to avoid errors?

Ensure the apparatus is airtight and without any bubbles, possibly by setting it up underwater and sealing gaps with Vaseline.

Why is using a potometer considered an indirect measurement of transpiration?

Because it measures water uptake, which can be used for photosynthesis and other processes, not just water evaporating from the leaves.

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