Scientists used radioactive hydrogen to make water. They grew plants using the radioactive water. What happened to the radioactive hydrogen during photosynthesis?(1 point)
Responses
It was recycled when water was formed.
It was recycled when water was formed.
It was recycled when glucose was formed.
It was recycled when glucose was formed.
It was recycled when hydrogen gas was formed.
It was recycled when hydrogen gas was formed.
It was recycled when light energy was formed.
During photosynthesis, plants convert carbon dioxide and water into glucose (C₆H₁₂O₆) and oxygen (O₂) using light energy. The general reaction can be written as:
6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂
Radioactive hydrogen (usually tritium, ³H, or deuterium, ²H) used to make water would be incorporated into the water molecules (H₂O). When plants undergo photosynthesis, the hydrogen from the water molecules becomes part of the glucose molecule.
So, the correct statement regarding what happened to the radioactive hydrogen during photosynthesis is:
It was recycled when glucose was formed.