In a food chain, the base of energy pyramid consists of: 

Correct option is C

·  In an energy pyramid, the base always consists of producers. These are organisms, such as plants, algae, and photosynthetic bacteria that produce energy through the process of photosynthesis or chemosynthesis.

·  Producers convert sunlight into chemical energy, which forms the foundation for energy flow in an ecosystem.

• The energy pyramid represents the flow of energy through different trophic levels in an ecosystem.
• Producers form the first trophic level, providing energy to primary consumers (herbivores), which in turn are consumed by secondary and tertiary consumers (carnivores and top predators).
• Energy diminishes as it moves up the pyramid due to loss through metabolic processes and heat.

• Primary consumers : These are herbivores that feed on producers, forming the second trophic level.
• Secondary consumers : These are carnivores or omnivores that eat primary consumers, forming the third trophic level.
• Tertiary consumers : These are top predators at the fourth trophic level.