Question

Write the difference between heterotrophic, saprotrophic and autotrophic mode of nutrition.

Answer 1

1. In heterotrophic mode of nutrition, organisms obtain their food from other living organisms.
2. In saprotrophic mode of nutrition, organisms obtain food from other dead organisms.
3. In autotrophic mode of nutrition, the organisms synthesize their own food.

Heterotrophic mode of nutrition	Saprotrophic mode of nutrition	Autotrophic mode of nutrition
Organisms feed on other organisms and obtain their nutrition	Organisms feed on dead and decay to obtain their nutrition	Organisms synthesize their own food in the presence of sunlight.
No such substrate is required. Producers as a whole are consumed by the consumers.	Substrate from which nutrients are obtained are dead and decay materials. Decomposers act upon it.	Food is prepared from CO2, H2O and sunlight.
Examples- All the animals	Examples- Bacteria and Fungi	Examples- All the green plants