A student was conducting a scientific experiment with a plant. She cut out three 1-inch circles from construction paper and attached each circle to a different leaf of the plant. Finally, she set the plant in front of a sunny window with good air flow and left it there. She made sure that the plant was given enough water during her experiment. After 2 days, she removed one of the circles; after 4 days, she removed another circle; and at the end of the week, she removed the last circle. Here are her results: Day 2: slight mark where the paper covered the leaf; it is a lighter green than the rest of the leaf. Day 4: yellow circle where the construction paper was. Day 7: almost white circle where the paper covered the leaf. Using your knowledge of photosynthesis, which answer choice explains her results the best? (1 point) Responses The part of the leaves that were covered with paper didn't allow for gas exchange through the leaf's stomata. Without oxygen, photosynthesis was unable to take place because the needed reactant of oxygen was missing. The part of the leaves that were covered with paper didn't allow for gas exchange through the leaf's stomata. Without oxygen, photosynthesis was unable to take place because the needed reactant of oxygen was missing. The part of the leaves that were covered with paper didn't get any light. Without light, cellular respiration was unable to take place because the mitochondria within the leaf cells were unable to absorb the ATP energy needed for the chemical reaction. The part of the leaves that were covered with paper didn't get any light. Without light, cellular respiration was unable to take place because the mitochondria within the leaf cells were unable to absorb the ATP energy needed for the chemical reaction. The part of the leaves that were covered with paper didn't get any light. Without light, photosynthesis was unable to take place because the chlorophyll within the leaf cells were unable to absorb the sunlight energy needed for the chemical reaction. The part of the leaves that were covered with paper didn't get any light. Without light, photosynthesis was unable to take place because the chlorophyll within the leaf cells were unable to absorb the sunlight energy needed for the chemical reaction. The part of the leaves that were covered with paper didn't allow for water to be absorbed. Without water, photosynthesis was unable to take place because the phloem was not able to bring the needed water molecules to the roots. The part of the leaves that were covered with paper didn't allow for water to be absorbed. Without water, photosynthesis was unable to take place because the phloem was not able to bring the needed water molecules to the roots. Skip to navigation

Question

A student was conducting a scientific experiment with a plant. She cut out three 1-inch circles from construction paper and attached each circle to a different leaf of the plant. Finally, she set the plant in front of a sunny window with good air flow and left it there. She made sure that the plant was given enough water during her experiment. After 2 days, she removed one of the circles; after 4 days, she removed another circle; and at the end of the week, she removed the last circle. Here are her results: Day 2: slight mark where the paper covered the leaf; it is a lighter green than the rest of the leaf. Day 4: yellow circle where the construction paper was. Day 7: almost white circle where the paper covered the leaf. Using your knowledge of photosynthesis, which answer choice explains her results the best? (1 point) Responses The part of the leaves that were covered with paper didn't allow for gas exchange through the leaf's stomata. Without oxygen, photosynthesis was unable to take place because the needed reactant of oxygen was missing. The part of the leaves that were covered with paper didn't allow for gas exchange through the leaf's stomata. Without oxygen, photosynthesis was unable to take place because the needed reactant of oxygen was missing. The part of the leaves that were covered with paper didn't get any light. Without light, cellular respiration was unable to take place because the mitochondria within the leaf cells were unable to absorb the ATP energy needed for the chemical reaction. The part of the leaves that were covered with paper didn't get any light. Without light, cellular respiration was unable to take place because the mitochondria within the leaf cells were unable to absorb the ATP energy needed for the chemical reaction. The part of the leaves that were covered with paper didn't get any light. Without light, photosynthesis was unable to take place because the chlorophyll within the leaf cells were unable to absorb the sunlight energy needed for the chemical reaction. The part of the leaves that were covered with paper didn't get any light. Without light, photosynthesis was unable to take place because the chlorophyll within the leaf cells were unable to absorb the sunlight energy needed for the chemical reaction. The part of the leaves that were covered with paper didn't allow for water to be absorbed. Without water, photosynthesis was unable to take place because the phloem was not able to bring the needed water molecules to the roots. The part of the leaves that were covered with paper didn't allow for water to be absorbed. Without water, photosynthesis was unable to take place because the phloem was not able to bring the needed water molecules to the roots. Skip to navigation

Answer 1

The best explanation for the student's results is: The part of the leaves that were covered with paper didn't get any light. Without light, photosynthesis was unable to take place because the chlorophyll within the leaf cells were unable to absorb the sunlight energy needed for the chemical reaction.

Answer 2

The best explanation for the student's results is: The part of the leaves that were covered with paper didn't get any light. Without light, photosynthesis was unable to take place because the chlorophyll within the leaf cells were unable to absorb the sunlight energy needed for the chemical reaction.

Answer 3

To determine the best explanation for the student's results, we need to consider the process of photosynthesis and how it is affected by the experiment. Let's break down the options:

Option 1: The part of the leaves that were covered with paper didn't allow for gas exchange through the leaf's stomata. Without oxygen, photosynthesis was unable to take place because the needed reactant of oxygen was missing.

Option 2: The part of the leaves that were covered with paper didn't get any light. Without light, cellular respiration was unable to take place because the mitochondria within the leaf cells were unable to absorb the ATP energy needed for the chemical reaction.

Option 3: The part of the leaves that were covered with paper didn't get any light. Without light, photosynthesis was unable to take place because the chlorophyll within the leaf cells were unable to absorb the sunlight energy needed for the chemical reaction.

Option 4: The part of the leaves that were covered with paper didn't allow for water to be absorbed. Without water, photosynthesis was unable to take place because the phloem was not able to bring the needed water molecules to the roots.

Given that the student set the plant in front of a sunny window with good air flow and provided enough water, we can eliminate option 4 because water absorption was not hindered. Now, let's focus on the remaining options.

Photosynthesis is the process by which plants use sunlight, carbon dioxide, and water to produce oxygen and glucose. The process occurs in the chloroplasts, where chlorophyll absorbs light energy.

Option 1 suggests that the lack of gas exchange through the stomata prevented oxygen from being available, impairing photosynthesis. While this is a valid explanation, it does not account for the light-dependent reactions of photosynthesis.

Option 2 links the lack of light to cellular respiration and ATP production in the mitochondria. However, it does not directly explain the observed effects on the leaves.

Option 3 aligns with our understanding of photosynthesis. Without light, chlorophyll cannot absorb the necessary sunlight energy for the chemical reaction, leading to a lack of photosynthesis. This option best explains the student's results.

Therefore, the best explanation for the student's results is that the part of the leaves covered with paper didn't get any light. Without light, photosynthesis was unable to take place because the chlorophyll within the leaf cells were unable to absorb the sunlight energy needed for the chemical reaction.