Question

What is difference between chemotrophs and phototrophic mode of nutrition?

Answer 1

In case of phototrophic mode of nutrition in which sunlight (photon) is source of energy to perform cellular activities for nutrition.So phototrophic organisms contain photosynthetic pigments e.g chlorophyll.
Chemotrophic organisms' source of energy is inorganic compounds.By oxidising those compounds they perform their nutrition.Naturally they have no photosynthetic pigments.
This is basic difference between them.
As I do not know your class so I gave here a standard difference (not detailed).
In higher studies you have to study detailed analysis.(In class 11 and 12)