Answer: Abundant amount of grass or decrease in the number of predators that eat grasshopper.
Step-by-step explanation:
There can be multiple reasons why the population of grasshopper may increase rapidly. Two of them are:
There might be a sudden increase in the number of greenery in an area which can favor the growth of grasshopper.
The second situation is when the population of lizards or birds eating grasshopper has decreased in number.