The size, shape and the green color of the insect are adaptions that would most likely help the insect to HIDE FROM PREDATORS.
Predators are living organisms that feed on other living organisms. Different living things have different adaptation techniques, which made them to adapt and survival in their environment. In the question given above, the size, shape and the green colour of the insect which matches that of the leave will prevent predators from spotting the insect, thus preventing it from been killed.
