00:01
So the question asks you to predict the structure of a function of a stomata and based on the characteristic of a plant to make prediction about the density of the stomata.
00:12
Stomata will be the little pores on the leaves and the stems.
00:17
So these are small pores.
00:21
So if you amplify each of those pores, you will look like they all look like this.
00:27
So they are made of two guard cells and they have a little pore in the center.
00:35
Let me draw it a little.
00:39
So you can see that the two guard cells have this bean shape, and they actually change shape sometimes.
00:45
We have guard cells, and they change shape according to the humidity in the cell, and also you will have a little pore in the center.
01:00
This pore facilitates the gas exchange and water transpiration.
01:04
This is the structure of a stomata.
01:07
The stomata is made up of two gar cells and the pore in between.
01:12
How does it work? during the dry weather, the gar cells actually shrink in size, so they look straight.
01:24
Because of the shape, the pore is minimal in size.
01:28
This means that you have a very small more pore in between the guard cells and when you have a smaller pores it actually prevents the water loss during transpiration now when you have a wet condition the guard cell change their shape and expand in size become this kidney or bean shape so you can see that now the pore has has much bigger size, bigger pore.
02:08
And the bigger pore will actually increase or facilitate water transpiration and also gas exchange.
02:24
So you can see that this is how the stomata regulate the water evaporation and gas exchange in response to the climate.
02:39
In the dry weather, the pore closed.
02:44
No water evaporated, or reduced water evaporation.
02:47
In a wet climate, the pore size becomes a lot bigger.
02:53
This will increase the water evaporation, transpiration, and gas exchange.
02:59
After i explain the function of this, let's predict the density of of the plant.
03:06
So first of all, vertical versus horizontal...