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.%0D%0A%0D%0AHere are her results:%0D%0A%0D%0ADay 2: slight mark where the paper covered the leaf; it is a lighter green than the rest of the leaf.%0D%0A%0D%0ADay 4: yellow circle where the construction paper was.%0D%0A%0D%0ADay 7: almost white circle where the paper covered the leaf.%0D%0A%0D%0AUsing your knowledge of photosynthesis, which answer choice explains her results the best?%0D%0A%0D%0A(1 point)%0D%0AResponses%0D%0A%0D%0AThe 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.%0D%0A%0D%0AThe 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.%0D%0A%0D%0AThe 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.%0D%0A%0D%0AThe 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.%0D%0A%0D%0AThe 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.%0D%0A%0D%0AThe 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.%0D%0A%0D%0AThe 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.%0D%0A%0D%0AThe 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.

Answer 1

The most appropriate answer choice that explains 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.