1} autotrophs --- green plants are able to prepare their own food from simple raw materials ---- carbon dioxide from the air , and water from the soil. plants get the enegy for preparing food from sunlight. this mode of nutrition where green plants make food themselves from simple substances is called autotrophic nutrition. such plants are therefore called autotrophs.
2} hetrotrophs --- animals and non - green plants, such as fungi and bacteria, cannot prepare their own food. they depend directly or indirectly on green plants for their nutrition. this mode of nutrition is called hetrotrophic nutrition. animals and non - green plants are known as hetrotrophs.