How many different food chains does the grassland food web in the figure contain?

Explanation

1. 01

   Start at the producer, grass, and follow every path of arrows to a consumer that nothing eats (the hawk).

2. 02

   Grass → grasshopper → frog → snake → hawk; grass → grasshopper → sparrow → hawk; grass → rabbit → hawk; grass → mouse → snake → hawk; grass → mouse → hawk.

3. 03

   That makes 5 chains.