Does
colour of light affect our bean sprouts’ growth?
If I ask, ‘Have you ever grown
bean sprouts?’ I trust most of you would
say yes. Somehow it’s become traditional or something that science teachers use
to help their students understand the lesson. We all observe how little green
leaves come out and grow up from seeds, and later we’ll (be forced to) learn
how plants did their photosynthesis so they could live on their own.
Then, my question started here. We
know that most of plants use light for photosynthesis, so what would happen if
we change the type of light? In this case the word ‘type’ I mean the wavelength
of light (we’ll know about it after we have known about photosynthesis for a few
years later). And the wavelength of light refers to the colour of light so this
is my question, what would happen to bean sprouts if we change the colour of
light?
My assumption is if we change the
colour of light (since plants can absorb different wavelength of light separately)
it should have varying rate of bean sprouts’ growth too.
These are equipment I used in this experiment.
- Toilet paper
- A tray
- Bean
sprouts seeds
- Green and red cellophanes
In case if you’ve never seen it, cellophane looks
like this.
I made three conditions for my experiment.
One has no cover on top of it
(bean sprout), one with green cellophane and another with red.
Then I grow it in the same place
so they can have same conditions, like temperature, humidity and light.
And I collect the data which contains
the growth of each bean sprout every day to see how it difference from another.
Well, before I tell you about what
the result is like, there’re some even more important things that I’ve missed.
My first thought was that if we
cover plants with colour cellophane, which we already have known that we can
see colour the object because that object absorb vary wavelengths of light but
its own wavelength (I mean the colour of that object that we see with our eyes),
the light after it went through cellophane should be changed.
Sunlight sometimes is called
visible light. In visible light, there is a spectrum that we usually know as a
colour of rainbow. But even there are many colour light in visible light, when
visible light pass through cellophane, it will still be a visible light. The
property of light won’t change. And about the colour of cellophane, it is just
that cellophane can have colour because its material absorbs some spectrum and
reflects some other. But it won’t change the light.
Let me tell you this. Light
couldn’t change its wavelength so easily that you could’ve done it by adding
some colourful transparent paper above. But I could say that my experiment went
wrong before I have started it. It’s wrong with it hypothesis. So no matter
what my result is like, it still doesn’t have anything to do with my
assumption. And because the light can’t change so easily, every plant should
have grown equally. And it has grown similarly. None of mass difference
happens, but it’ll be clearer if we have done it with more time and more
conditions.
So for now I’ll conclude that there
is not difference with the growth of bean sprouts if we cover it with colour
plastic.
Prerasa Kositvichaya 25
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