Chloroplasts were discovered as the site of photosynthesis in an ingenious experiment. What was it?
A)Oxygen could be seen as it was produced in chloroplasts.
B)Chloroplasts were seen to swell in the presence of sunlight.
C)Spirogyra in the dark shrank and their chloroplast disappeared.
D)When Spirogyra was illuminated, actively moving bacteria gathered outside the cell near its large ribbon-like chloroplast to use the oxygen produced there for aerobic respiration.

Question

Quizplus · Accepted Answer

In the experiment, Spirogyra was illuminated and actively moving bacteria gathered outside the cell near its large ribbon-like chloroplast to use the oxygen produced there for aerobic respiration. This supported the idea that chloroplasts are the site of photosynthesis and produce oxygen as a byproduct. Option A is incorrect because oxygen cannot be seen as it is produced in chloroplasts. Option B is incorrect because chloroplasts do not swell in the presence of sunlight. Option C is incorrect because Spirogyra would not shrink in the dark, but rather the chloroplasts would lose their green coloration.

Chloroplasts Were Discovered as the Site of Photosynthesis in an Ingenious