Question

a student conducts an experiment to test the changes a plant undergoes as it is exposed to light. the student uses two identical healthy bean plants with the same baseline nutrient amount. one plant is exposed to 10 hours of sunlight daily, while the other plant is kept in darkness for 10 days. the student uses indicators to test for the amounts of sugar and starch in the leaves at the start of the experiment, after 5 days, and then at the end of 10 days. the data table shows the experimental results. table: location (light, light, dark, dark); nutrient (sugar, starch, sugar, starch); amount of nutrient (day 5: +, +, -, -; day 10: ++, +, -, -) which statement represents a valid conclusion based on the experimental results? options: plants do not require light to produce sugars and starches. plants require light to produce sugars and starches. plants require light to produce starches, but sugar production does not require light. plants do not require light to produce starches, but sugar production requires light.

Explanation:

1. Analyze the data for sugar: In light (day 5: +, day 10: ++), in dark (day 5: -, day 10: -). So sugar production needs light.
2. Analyze the data for starch: In light (day 5: +, day 10: +), in dark (day 5: -, day 10: -). Wait, no, wait the "light" here—wait, the "light" condition and "dark" condition. Wait, the "light" plant (exposed to light) has sugar and starch, dark has none. Wait, no, the options: Let's check each option.

• Option 1: Plants do not require light to produce sugars and starches. But in dark, sugar and starch are -, so this is wrong.
• Option 2: Plants require light to produce sugars and starches. In light, both sugar (++, +) and starch (+, +) are present; in dark, both are -. So this matches.
• Option 3: Plants require light to produce starches, but sugar production does not require light. But in dark, sugar is -, so sugar needs light. Wrong.
• Option 4: Plants do not require light to produce starches, but sugar production requires light. In dark, starch is -, so starch needs light. Wrong.

So the correct conclusion is that plants require light to produce sugars and starches.

Answer:

The correct option is: "Plants require light to produce sugars and starches." (Assuming the option identifiers are as per the order, e.g., if it's the second option, then the answer would be the option text corresponding to that, but based on analysis, the statement "Plants require light to produce sugars and starches" is the valid conclusion.)