Question

why did the DJI WN make a hump on the camel's back​

Answer 1

A camel's hump does not hold water at all – it actually stores fat. The camel uses it as nourishment when food is scarce. If a camel uses the fat inside the hump, the hump will become limp and droop down. With proper food and rest the hump will return to normal.

Answer 2

The Camel did not want to work at all until he was punished for his reluctance. Djinn wanted him to do the assigned work but seeing his irresponsible behaviour he had to punish him by puffing up a hump on his back