Chloroplasts Were Discovered as the Site of Photosynthesis in an Ingenious

Multiple Choice

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.
E) None of these are correct.