Assertion : The mode of nutrition in higher animals is heterotrophic.
Reason : Animals can use different trophic levels for heterotrophic nutrition.
Highergroup of animals are unable to trap energy directly from the sun for the synthesis of organic compounds required by them. Thus organic compounds synthesized by plants form the final source of energy for animals. This mode of nutrition is called heterotrophic nutrition. As animals are heterotrophs, they can use different trophic levels of ecosystem for the purpose of nutrition.