Question

The learner did not put vaseline on either surface of leaf 1 what was the purpose of leaf 1

Answer 1

If vaseline applied only in one surface of leaves so stomata will close no water loss occur as vapour.

Answer 2

The purpose of the leaf without Vaseline is that underneath the leaves are the stomata. When petroleum jelly is put beneath the skin, the stomata become fully blocked, limiting photosynthesis. Despite receiving water and sunlight, the plant died because it was unable to assimilate food.