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?
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 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 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 answer choice that explains her results the best 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.
The best answer choice that explains her 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."
To arrive at this answer, we need to understand the process of photosynthesis. Photosynthesis is the process by which plants convert sunlight into glucose and oxygen. It requires the presence of chlorophyll, a pigment found in the chloroplasts of plant cells, which absorbs sunlight energy.
In this experiment, the part of the leaf covered with paper did not receive any light. Without light, photosynthesis cannot occur, as the chlorophyll within the leaf cells cannot absorb the necessary sunlight energy for the chemical reaction. As a result, the covered portions of the leaf showed lighter colors and eventually turned yellow or white, indicating the absence of photosynthesis.
The other answer choices can be eliminated by considering their implications. Phloem is responsible for transporting sugars and other nutrients throughout the plant, but it does not directly affect photosynthesis. Cellular respiration is a separate process that occurs in mitochondria and requires oxygen to break down glucose and produce ATP energy, but it is not directly related to the process of photosynthesis. Oxygen is a byproduct of photosynthesis, so its absence would not prevent photosynthesis from occurring.
Therefore, the best explanation for her results is that the lack of light due to the paper covering prevented photosynthesis from taking place in the covered areas of the leaf.
The best answer choice that explains her 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.