Question

using graphs and charts read the information and observe the graph or chart provided. then record your claim, evidence, and reasoning on the lines. plants need sunlight, water, and carbon dioxide (co₂) in order to make food and release oxygen (o₂) in a process called photosynthesis. scientists wanted to study the effect of the amount of sunlight, or light intensity, on carbon dioxide uptake, or how much the plants take in. they studied tropical plants near the equator and made the following graph based on their results. question: what happens to the amount of carbon dioxide taken out of the air as the amount of sunlight increases? claim (answers the question): ________ evidence (observations/data): ________ reasoning (connect the claim and evidence using science – why does this make sense?):

Explanation:

Answer:

Claim: As the amount of sunlight (light intensity) increases, the amount of carbon dioxide taken out of the air (CO₂ uptake) initially increases and then levels off (or increases at a decreasing rate until it stabilizes).
Evidence: The graph shows that as light intensity increases along the x - axis, the CO₂ uptake (y - axis) curve rises steeply at first and then becomes more horizontal, indicating that CO₂ uptake increases with light intensity but the rate of increase slows down and eventually the uptake stops increasing significantly.
Reasoning: Plants use sunlight for photosynthesis, which requires CO₂. At low light intensities, increasing light provides more energy for photosynthesis, so CO₂ uptake increases. However, at high light intensities, other factors like the availability of CO₂ or the capacity of the plant's photosynthetic machinery (e.g., enzyme activity, chlorophyll content) become limiting, so the rate of CO₂ uptake slows and then stabilizes as the plant reaches its maximum photosynthetic rate under those conditions.