Which organism in the crop-field food web shown occupies the greatest number of different trophic levels?

Explanation

1. 01

   Chains: wheat → rat → owl; wheat → rat → snake → peacock; wheat → locust → peacock; wheat → locust → lizard → snake → peacock.

2. 02

   The peacock is at levels 3, 4 and 5; the snake at 3 and 4; the owl only at 3; the rat only at 2.