Question

Scientists used radioactive hydrogen to make water. The scientists grew plants using the radioactive water. Based on their observations, they concluded that hydrogen is recycled during photosynthesis. Which observation provides evidence for this conclusion? (1 point)
Responses

Light in the plant’s leaves was radioactive.
Light in the plant’s leaves was radioactive.

Water vapor near the plant was radioactive.
Water vapor near the plant was radioactive.

Hydrogen gas in the surrounding air was radioactive.
Hydrogen gas in the surrounding air was radioactive.

Glucose in the plant’s stem was radioactive.
Glucose in the plant’s stem was radioactive.

Answer 1

choose one from the choices

Answer 2

The observation that provides evidence for the conclusion that hydrogen is recycled during photosynthesis is: Water vapor near the plant was radioactive.

Answer 3

My apologies for the repetition. The correct response is: Glucose in the plant’s stem was radioactive. This observation indicates that the radioactive hydrogen from the water was incorporated into glucose during photosynthesis, supporting the conclusion that hydrogen is recycled during photosynthesis.