Which describes why radioisotopes can be used as tracers in studying the biological and chemical processes of plants?

1. The radioisotope is chemically identical to the nonradioisotope the plant normally uses.
2. The radioisotope is absorbed more quickly than the nonradioisotope the plant normally uses.
3. The radioisotope converts the nonradioisotope normally used by a plant into a radioisotope.
4. The radioisotope travels through the plant without participating in any chemical processes.

1. The radioisotope is chemically identical to the non-radioisotope the plant normally uses.

Explanation:

Radioactive Tracer:

A radioactive tracer is a chemical compound that contains an attached radioisotope. This is used as a diagnostic techniques to trace various metabolites and chemical compounds involved in chemical reactions in the body.

A radioactive tracer consists of a radioisotope and a carrier molecule that is identical to the compound actually involved in the pathway or chemical reaction occurring in the plant.

The tracer emits radiation, particularly, gamma rays that can be detected by techniques such as X-ray tomography (CT scan) or positron emission tomography (PET).

1. The radioisotope is chemically identical to the non-radioisotope the plant normally uses.

Explanation:

the answer is:

carbon dioxide