Science 5: Photosynthesis
Today's lesson is on photosynthesis, but it has nothing to do with synthesizing photos. Weird, huh? Instead we'll be talking about the all-important process that generates the air we breathe. Though we're sure the process that generates your cat photos is pretty important too...
|Elementary and Middle School||5th Grade|
The rust accumulating on your bicycle...
Or the banana in your lunch turning brown... aka the grossest thing to ever happen in the
history of the universe. [Guy looks grossed out]
Okay maybe get back under the desk.
Let's get back to bacon and rust!
…Well. Not at the same time.
No one likes rusty bacon… [Girl holding a piece of rusty bacon]
These are just a couple examples of chemistry in action.
And there's one chemical reaction in particular that you're reaping the benefits of every
No, not bacon again.
We're talking about photosynthesis!
When you think of the word photosynthesis, you probably think of a plant.
And guess what?
You'd be right!
But at the risk of offending the other big player in this totally awesome chemical reaction, [Plant on a table]
allow us to introduce the co-star of photosynthesis, the Sun! [Crowd cheering for the Sun on stage]
Seriously, he gets a little hot-headed if you don't give him proper credit…
It all starts with our plant here collecting a whole lot of stuff in its leaves, including
carbon dioxide from the air, and water from its roots that travels up into the rest of [Arrows showing the flow of water]
Next, the sun comes in, shining rays of sunshine down onto the plant.
The leaves of the plant absorb these too.
Once the sun's involved, the rays actually cause the carbon dioxide and water to combine [All the components combining]
and form a sugar called glucose, which the plant uses as food. [Apples appear on the tree]
We'd guess this is the plant's favorite part of the whole process.
Pretty sweet, right?
But what's even sweeter than the glucose produced is the by-product that comes as a result of
it – a little thing we like to call oxygen.
This oxygen is then released by the plant and back into our atmosphere. [Outwards flow of oxygen shown]
And where does that oxygen go next?
Into your lungs, of course. [Guy breathing in the oxygen]
But not just human lungs.
And cow lungs.
And gorilla lungs. [All the animals under a tree]
And the lungs of every other oxygen-breathing animal on earth.
All because the sun and these plants got together and decided to make some sugar.
And if that wasn't useful enough already, photosynthesis also plays an important part
in removing excess carbon dioxide put into the atmosphere by humans and the burning of [Big factory giving off carbon dioxide]
They're actually cleaning pollution out of our air. [Trees appear and begin to clean the air]
Now how's that for impressive?
So the next time you pass by a plant, why not stop by and say thanks for all its hard work?
On second thought, maybe don't do that.
It'll probably look a little weird. [Guy saying the plant is his hero, another guy looks confused]