AP BIOLOGY

Detailed explanation-1: -Herbivores feed on the plants. Plants are the producers whereas the herbivores will be considered as primary consumers . Carnivores feeding on the herbivores are called secondary consumers. Therefore, all food chains start with a producer.

Detailed explanation-2: -Every food chain starts with producers because only plants are capable of changing light energy into chemical energy, which is then used by both plants and other consumers.

Detailed explanation-3: -All food chains start with energy from the sun. This energy is captured by plants. Thus the living part of a food chain always starts with plant life and ends with an animal. Plants are called producers because they are able to use light energy from the sun to produce food (sugar) from carbon dioxide and water.

Detailed explanation-4: -Producers, also known as autotrophs, make their own food. They make up the first level of every food chain.

Detailed explanation-5: -Producers, who make their own food using photosynthesis or chemosynthesis, make up the bottom of the trophic pyramid. Primary consumers, mostly herbivores, exist at the next level, and secondary and tertiary consumers, omnivores and carnivores, follow.