Final answer:
The organism feeding on a primary consumer in this food chain is the Owl.
Step-by-step explanation:
In this food chain, the organism that is FEEDING on a primary consumer is Owl. The food chain starts with Grass as the producer, which is then consumed by the primary consumer, Grasshopper. The secondary consumer, Snake, feeds on the primary consumer, and finally, the Owl feeds on the snake, making it the organism that is feeding on a primary consumer.
Learn more about Food chain