LIFE SCIENCE

Detailed explanation-1: -Producers make up the first trophic level. Producers, also known as autotrophs, make their own food and do not depend on any other organism for nutrition. Most autotrophs use a process called photosynthesis to create food (a nutrient called glucose) from sunlight, carbon dioxide, and water.

Detailed explanation-2: -The first order consumers or primary consumers are always herbivores since they feed on the producers directly. Autotrophs are organisms that produce food using nutrients from the soil and sunlight and are also called producers.

Detailed explanation-3: -The first trophic level in any ecosystem is formed by producers. In an aquatic ecosystem like a lake phytoplankton are the producers and hence form the first trophic level.