Answer 1:
1) Do different spectra of light effect the
growth of plants differently? (Ignoring green)
Higher-energy light, toward the blue-violet end of
the spectrum would potentially give plants more
energy, but different plants have different
pigments for capturing the light. Also, as the
answer you read mentioned, light in the red end of
the spectrum may be a cue to flower.
There’s a good article on this at:
what
light do plants need
2) Do specific combinations of light i.e.
red, yellow and blue of an equal intensity to
solar light effect plants' growth?
I’m not sure what you’re asking. Are you thinking
that blocking some wavelengths decreases the total
amount of light, and boosting the intensity of
other wavelengths to compensate? That would be
good scientific thinking. Different combinations
of light would be interesting to test.
3) Does the effectiveness of the light on
photosynthesis vary throughout the day? If so do
different spectra affect this?
Are you asking about whether the plant’s response
changes throughout the day, or whether changes in
the angle of the sun influences the amount of
light available to the plant?
If you are asking about the plant, plants that
evolved in dry places usually close their stomata
(leaf holes) when they get too dry. This keeps
reduces the amount of water that evaporates, but
keeps them from letting in the CO2 they
need for photosynthesis.
If you are asking about the angle of the sun, the
intensity will be highest around noon.
The above questions are to aid in setting a
baseline for experiments, as I haven't been able
to find any definitive proof online.
Just a reminder, we can never prove our hypothesis
is true. We can only support it.
I hope this helps.
Good luck with your experiments.
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