Asked by a
Question/Problem
do plants take c02
Hypothesis
If plants to take co2 from the air, then the brothamal blue (turned yellow) will be blue
Materials Used
(What do you need for your experiment? Your list must be accurate, complete, and specific. Only 3 things or less.)
Methods & Procedure
(Write the instructions step-by step so it is repeatable by someone else)
Results
Observations
(What did you notice with your senses?)
Conclusions
(Answer your question from the purpose at the top. Does the data support your hypothesis and is it correct? How can you make improvements or what would you do differently?)
All Answers 1
Answered by
GPT-5 mini
AI
Question / Purpose
Do plants take up (remove) CO2 from their surroundings?
Hypothesis
If a plant takes CO2 from the water/air, then a bromothymol blue (BTB) solution that has been turned yellow by CO2 (acidic) will become green then blue as the plant removes CO2 and the solution becomes less acidic.
Materials (only 3)
- Bromothymol blue indicator solution (enough to fill two small clear jars; prepare so it is blue at neutral pH)
- Two clear jars or test tubes with lids (or two clear cups you can cover)
- One healthy sprig of Elodea (aquatic plant) or a small green plant cutting that can be placed in water
Methods & Procedure (step-by-step)
1. Pour about 40–50 mL of bromothymol blue solution into each of the two jars. The solution should be blue at this point.
2. Make the solution acidic (turn it yellow) by bubbling CO2 into each jar: place a clean straw in the solution and blow gently for 5–15 seconds until the BTB turns yellow. (Do this the same for both jars so they start at the same color.)
3. Immediately place the Elodea sprig into Jar A (the experimental jar). Leave Jar B without a plant as the control.
4. Cover both jars with their lids (or cover cups) and place both jars in the same location with bright light (a sunny windowsill or under a lamp) so they get equal light and temperature.
5. Observe and record the color of the BTB in each jar at regular intervals (for example, at 10, 20, 30, 60 minutes, then hourly up to 3–4 hours). Also note any bubbles forming on the plant.
6. Continue observations for several hours. Optionally repeat the experiment with a duplicate set (replicate) or place a jar in the dark as an additional control.
Results (example of expected results — fill these in with your actual observations)
- Time 0: Both jars yellow.
- 10–30 minutes: Jar A (with Elodea) begins to shift from yellow → green; small bubbles appear on Elodea leaves. Jar B (no plant) remains yellow.
- 60–180 minutes: Jar A becomes blue or green-blue. Jar B stays yellow (or becomes slightly more yellow).
- Bubbles on Elodea suggest oxygen production.
Observations (what you notice with your senses)
- Color change of indicator (yellow → green → blue) in the jar with the plant.
- Small clear bubbles forming on the plant in the light (bubbles are oxygen).
- The control jar with no plant does not change color (stays yellow) over the same time period.
Conclusions
- Answer to the question: Yes — under light, the plant removed CO2 (from the water), demonstrated by the BTB changing from yellow back toward blue.
- Does the data support the hypothesis? Yes. The experimental jar with the plant changed color toward blue while the control remained yellow, which supports the idea that the plant was using CO2 (reducing acidity) during photosynthesis.
- Improvements / what to do differently:
- Add a dark control with a plant kept in the dark to separate photosynthesis from respiration (in the dark a plant will not remove CO2 and the solution may stay yellow or become more acidic).
- Use replicates (at least 3 of each condition) for more reliable results.
- Keep volumes, plant size, and light intensity the same between samples.
- Measure pH with a meter for quantitative data or use a CO2 sensor if available.
- Allow less delay between acidifying the solution and adding the plant to reduce variability.
Notes / Limitations
- BTB reports pH changes caused by dissolved CO2 but can be affected by other acids/bases; the control helps account for that.
- The experiment shows CO2 uptake in water (aquatic photosynthesis). For terrestrial plants, you would adapt the setup (e.g., enclose a leaf in a sealed chamber with BTB exposed to exhaled air) but principles are similar.
If you want, I can write this up in a printable lab report form or create a version with a dark-control and measurement table you can use to record your own data.
Do plants take up (remove) CO2 from their surroundings?
Hypothesis
If a plant takes CO2 from the water/air, then a bromothymol blue (BTB) solution that has been turned yellow by CO2 (acidic) will become green then blue as the plant removes CO2 and the solution becomes less acidic.
Materials (only 3)
- Bromothymol blue indicator solution (enough to fill two small clear jars; prepare so it is blue at neutral pH)
- Two clear jars or test tubes with lids (or two clear cups you can cover)
- One healthy sprig of Elodea (aquatic plant) or a small green plant cutting that can be placed in water
Methods & Procedure (step-by-step)
1. Pour about 40–50 mL of bromothymol blue solution into each of the two jars. The solution should be blue at this point.
2. Make the solution acidic (turn it yellow) by bubbling CO2 into each jar: place a clean straw in the solution and blow gently for 5–15 seconds until the BTB turns yellow. (Do this the same for both jars so they start at the same color.)
3. Immediately place the Elodea sprig into Jar A (the experimental jar). Leave Jar B without a plant as the control.
4. Cover both jars with their lids (or cover cups) and place both jars in the same location with bright light (a sunny windowsill or under a lamp) so they get equal light and temperature.
5. Observe and record the color of the BTB in each jar at regular intervals (for example, at 10, 20, 30, 60 minutes, then hourly up to 3–4 hours). Also note any bubbles forming on the plant.
6. Continue observations for several hours. Optionally repeat the experiment with a duplicate set (replicate) or place a jar in the dark as an additional control.
Results (example of expected results — fill these in with your actual observations)
- Time 0: Both jars yellow.
- 10–30 minutes: Jar A (with Elodea) begins to shift from yellow → green; small bubbles appear on Elodea leaves. Jar B (no plant) remains yellow.
- 60–180 minutes: Jar A becomes blue or green-blue. Jar B stays yellow (or becomes slightly more yellow).
- Bubbles on Elodea suggest oxygen production.
Observations (what you notice with your senses)
- Color change of indicator (yellow → green → blue) in the jar with the plant.
- Small clear bubbles forming on the plant in the light (bubbles are oxygen).
- The control jar with no plant does not change color (stays yellow) over the same time period.
Conclusions
- Answer to the question: Yes — under light, the plant removed CO2 (from the water), demonstrated by the BTB changing from yellow back toward blue.
- Does the data support the hypothesis? Yes. The experimental jar with the plant changed color toward blue while the control remained yellow, which supports the idea that the plant was using CO2 (reducing acidity) during photosynthesis.
- Improvements / what to do differently:
- Add a dark control with a plant kept in the dark to separate photosynthesis from respiration (in the dark a plant will not remove CO2 and the solution may stay yellow or become more acidic).
- Use replicates (at least 3 of each condition) for more reliable results.
- Keep volumes, plant size, and light intensity the same between samples.
- Measure pH with a meter for quantitative data or use a CO2 sensor if available.
- Allow less delay between acidifying the solution and adding the plant to reduce variability.
Notes / Limitations
- BTB reports pH changes caused by dissolved CO2 but can be affected by other acids/bases; the control helps account for that.
- The experiment shows CO2 uptake in water (aquatic photosynthesis). For terrestrial plants, you would adapt the setup (e.g., enclose a leaf in a sealed chamber with BTB exposed to exhaled air) but principles are similar.
If you want, I can write this up in a printable lab report form or create a version with a dark-control and measurement table you can use to record your own data.
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