What would happen to a plant if its leaves were covered with a waterproof petroleum jelly?

If a plant's leaves were covered with a waterproof petroleum jelly, it would likely suffer from impaired gas exchange and reduced photosynthesis. The jelly would block the stomata, preventing the uptake of carbon dioxide and the release of oxygen and water vapor. As a result, the plant could experience stress, stunted growth, and eventually decline or die if the coverage is prolonged. Additionally, the lack of transpiration could lead to water accumulation and other physiological issues.