What the person said above me
The stem of the plant should be cut at least three to four inches above the surface level.
The glass capillary should be tightly fixed with the stem.
The initial water level and the final water level should be carefully noted.
The droplets on the leaves should be observed and conclude that these drops are not from transpiration.
I would say microscope because that’s what was used to to figure out about these other organisms. Sorry if not
Answer:
D. it reduces pest insect population
