Question

what do you think that will it happen if you got the leaves of a green plant with oil

Answer 1

If leaves are coated with oil the leave will die because there are small pores present on the leaf called stomata. These pores help in exchange of gases.
So when we apply oil on the leaf the oil closes the pores or the stomata and respiration doesn't takes place and the leaf may die.

Answer 2

If the leaves of a money plant are coated with oil, then stomata present on the surface of the leaf will get blocked.Gaseous exchange also takes place through stomata. So, if stomata are blocked, gaseous exchange would be affected which would decrease photosynthesis.
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Hope this well help you