In an experiment, the hypothesis is if the wavelength of the light shining on a plant is shortened, the rate of photosynthesis is slowed down. if this experiment is performed,

the rate of photosynthesis will increase
the plant will die
the rate of photosynthesis will slow down
the result can be determined

The result can be determined.

Explanation:

In the process of photosynthesis, the light energy from the sun is absorbed by the plants, to synthesize their food in the form of carbohydrates by using reactants such as carbon dioxide and water. The rate of photosynthesis can vary on the basis of intensity and wavelength of the light responsible for photosynthesis.

A hypothesis is a supposed presumption that is based upon little evidences framed in statement(s). The hypothesis is required to be tested and verified on the basis of experimental process.

According to the given situation, the given hypothesis can be correct or incorrect that can be determined on the basis of determination of results that obtain after the conduction of the experiment.

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

the answer to this question is 3.