Answer 1:
Those are good questions. Testing one level
on one plant doesn’t tell you anything because
each individual plant is different. You also
need to compare plants that are alike in every way
except for the amount of chlorine. You could have
a series of amounts of chlorine, such as none,
a little, medium, and high, then have two or
three plants at each level. The big question is
what level is high or low. I could see if anyone
has tested anything like this if you tell me what
sort of plant you’re using. That could give you
an idea of the range of chlorine levels you might
try. Some plants are probably much more sensitive
to chlorine than other plants are.
Thanks for asking.
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Answer 2:
That question doesn't have a simple answer.
More plants to do the experiment means that you
can be more sure of your results. If you don't
have enough plants, it could be just chance.
However, there is no hard number of what is
"enough" - no matter how many plants you have,
your results could still be just chance, but it is
less and less likely the more plants you have.
As for how much you need, that depends on what
you want to do with the chlorine. A very small
amount of chlorine will be necessary, but too much
will be poisonous. By doing an experiment, you
will be able to say that some amount of chlorine
affects plant growth, and you will also be able to
say that some amount of chlorine DOES NOT affect
plant growth, both of which are useful questions.
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