Why is it necessary to divide the plants into two groups (a control group and an experimental group)

Explanation:

The groups should be divided into control and experimental groups because; in the control group the plants would not be subjected to the independent variable or treatment which the experimental groups would. Hence there would be answers to the experiments and a wide range of data and analysis to be collected and conclusions to be drawn

i think it is true in my reasonment ..

a researcher conducts an experiment on the secretion of a particular hormone in mice. scientists inject mice with a substance that stimulates the production of the hormone. the scientists then test the levels of hormones produced by the mice. the tool used to measure the hormones consistently detects the levels at 10 points lower than the actual hormone levels in the mice. this tool makes measurements, but the measurements aren't .

explanation:

no u