Why
is the Grass Is Green?
Close Look at
Photosynthesis

Lets have a look through our Microscope at a typical leaf. To our human eye a leaf seems to be all green, but is that true, or is it an illusion. Looking through a microscope the individual plant cells that can be seen are not that green after all. Instead of being what we thought they are mostly transparent, but each cell contains around 50 to 100 tiny green dots. The correct name for these green dots is chloroplast's, this is where the light sensitive chlorophyll is found and where the process of photosynthesis happens.

So what is happening inside the chloroplast's?

The chloroplast is likened to a tiny bay with even smaller bags inside called thylakoids . And this is where the green colour comes from. The green chlorophyll molecules are embedded in the surface of the thylakoids, these molecules are not embedded at random but are carefully arranged, this is called photosystems.

Two Types of Photosystems


Most green plants contain two types of photosytems, these are known as PS1 and PS2. Each as specific jobs to take care of, in the steps of photosynthesis.

Absorbing The Sunlight

When the sunlight hits the surface of the thylakoid, PS2 chlorophyll molecules are ready to catch it. PS2 molecules are especially interested in catching the red light of a specific wavelength. Again in the thylakoid the PS1 arrays are catching the light from a different longer wavelength. At the same time chlorophyll and other molecules for example carotenoids are absorbing violet and blue light.

So now the big question, why is the grass green?

From all the wavelengths that fall on plants only one light is useless to them, and this colour is simply reflected away, like a mirror.

You guessed it, the colour of light that is useless to the plants in the green light.

 





 

 






 

 

error: embedded map could not be displayed.

error: embedded map could not be displayed.

error: embedded map could not be displayed.

error: embedded map could not be displayed.

error: embedded map could not be displayed.

error: embedded map could not be displayed.