Question

in the experiment of comparison of rate of transpiration in upper and lower surfaces of leaf,
Apply Vaseline to leaf surface in the following manner,

1. Leaf A: - Petroleum jelly is applied on both the surfaces
2. Leaf B: - Petroleum jelly is applied on lower surface only
3. Leaf C: - Petroleum jelly is applied on the upper surface only
4.Leaf D:- Petroleum jelly is not applied
Observe the order of drying of these leaves, 2-3 days after setting of the apparatus and then prepare observation table.
Observation table:-

Sr. no.
1
2
3
4

Type of leaf
Leaf A
Leaf B
Leaf C
Leaf D

Observations​

Answer 1

Explanation:

because this types of leaves are dotted with some pores called stomata .

@Marzi