16th of September 2015

a statement forced me to think that electolysis occurs in plant itis

"plants obtain hydrogen and oxygen form water"

but water is a molecule of hydrogen and oxygen .how come they can obtain both of them separately by water .

and also is there any other process through which hydrogen and water can be separated????????????/

Yerram.varun Yerram - CBSE - Class IX

Wednesday, September 16, 2015 at 18:22:PM


Hi Varun,

Plants absorb water from the ground through their roots. During photosynthesis, the energy from the sun splits the water molecules into hydrogen and oxygen. This splitting of water into oxygen and hydrogen occurs in the presence of light and hence, the process is called photolysis of water. The oxygen molecules are given off by the plant and emitted into the atmosphere. The hydrogen molecules are used by the plant during photosynthesis to create energy in the form of ATP. 

Wednesday, September 16, 2015 at 18:30:PM