In the food chain comprising of a snake, grass, insect, and frog, the secondary consumer is :
(a) insect (b) snake (c) frog (d) grass
(c) frog
The grass is eaten by the insect, which is eaten by the frog, which is eaten by the snake. Hence, the grass is the producer, the insect is the primary consumer, the frog is the secondary consumer and the snake is the tertiary consumer.