The experimental principle is the theoretical basis of this experiment.

The experimental hypothesis is inferred on the basis of this theory and needs to be verified by experiments.

For example, whether auxin can also delay leaf senescence is tested by experiments.

The experimental principle is that the leaves in vitro will gradually age and turn yellow. After treatment with a certain concentration of cytokinin, the green retention time can be significantly prolonged and the senescence of leaves in vitro can be delayed.

The experimental hypothesis is that auxin can delay leaf senescence.

Not all experiments have principles and assumptions.

All experiments have principles, and only verification experiments have hypotheses. Experiments such as extraction and separation are not hypothetical.

But generally speaking, the biological experiment design of senior high school entrance examination is generally a confirmatory experiment.