Question Video: Identifying the Table That Correctly Matches Structures within the Chloroplast to the Photosynthetic Reaction Happening in Them Biology

Which of the following tables correctly matches structures within the chloroplast to the photosynthetic reaction that occurs in each? [A] Table A [B] Table B [C] Table C [D] Table D

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Video Transcript

Which of the following tables correctly matches structures within the chloroplast to the photosynthetic reaction that occurs in each?

Chloroplasts are cell organelles within plant cells that act as the site of photosynthesis. They have multiple specialized structures within them, including stroma, thylakoids, and a double membrane. Each structure has a particular function. But which structure is involved in the light-dependent reaction and which is involved in the light-independent reaction?

In the light-dependent stage, light energy is absorbed by the plant and stored as usable energy. The thylakoid membranes contain pigments, such as chlorophyll, that absorb light. A series of reactions then occurs in which the light energy absorbed by the chlorophyll is stored in ATP molecules. This means that the thylakoid membrane is the site of the light-dependent reaction. This information indicates that the table that correctly matches chloroplast structures to the photosynthetic reaction is table (B). But let’s discuss where the light-independent reaction happens, just to be sure.

In the light-independent stage of photosynthesis, the energy stored in ATP is converted and used to form carbohydrates. This occurs in the stroma, the fluid matrix within the chloroplast that contains enzymes, which play a role in this reaction. So, the correct answer is indeed given by table (B). The thylakoid membranes are the site of the light-dependent stage of photosynthesis, and the stroma is the site of the light-independent reaction.

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