The classification of organism helps them to make their study easy and their organization. The organism can be classified on the basis of similarity and differences among them.
The organism that can prepare their own food are known as autotrophic organism. The organism that cannot prepare their own food and depends on the other plants and animals for their food are known as heterotrophic organism or heterotroph.
In a series of reactions the energy is converted (along an electron transport process) into ATP and NADPH. Water is split in the process, releasing oxygen as a by-product of the reaction.
