Which organisms is the secondary consumer in the following food chain ?
plant > caterpillar > lizards > snake

The caterpillar is the primary consumer. If an organism eats plants, it is a primary consumer. If it eats other animals, it is a secondary or tertiary consumer.

Lizard

Explanation:

Every food chain starts with producers and here the producers is plant that makes food by the help of the process known as photosynthesis.This process converts the solar energy into chemical energy.

The primary consumer is caterpillar that is dependent on the plants for its energy need. They are most herbivores.

The secondary consumers depend on the primary consumer for their food. Here, Lizard is secondary consumer.