Answer:
A). They used a radioactive isotope and tracked it with a Becquerel counter.
B.)They used a radioactive isotope and tracked it with a Geiger counter.
C.) They used a stable isotope and tracked it with a Becquerel counter.
D.) They used a stable isotope and tracked it with a Geiger counter.
B.)They used a radioactive isotope and tracked it with a Geiger counter.
Radioactively-labeled water and carbon dioxide were given to plants to test the source of the released oxygen in photosynthesis
The emitted radiations by such a radioisotope could tracked by devices, such as Geiger-Müller countes that detect radioactivity
Explanation:
Van Neil proposed that the oxygen from water realised as elemental oxygen while the hydrogen combined in the process of photosynthesis to form glucose
It was later confirmed by Samuel Ruben and Martin Kamen, by using radioisotopes to map out how oxygen flowed in plants. This was by giving one of two groups of plants radioactively-labeled water and unlabeled carbon dioxide while the second group was given
radioactively-labeled carbon dioxide and unlabeled water from where it was observed that oxygen from the group that was given radioactively-labeled was radioactive
