Question

Bulliform cells are found in
A. Seeds of sunflower
B. Leaf of wheat
C. Pod of pea
D. Tuber of potato

Answer 1

Hint: Bulliform cells are large epidermal cells that can store water. Found in structures that are more prone to water loss.

Complete answer:
Bulliform cells are found in the leaf of wheat. Bulliform cells are bubble-shaped cells that are present in groups near the mid-vein portion on the upper surface of the leaves of many monocots. The presence of these cells helps the cell to survive stress conditions. These are large, empty, and transparent cells that can store water. During sufficient water supply, Bulliform cells absorb water and become rigid due to which the leaf opens up and becomes straight (more surface area is exposed). But, insufficient water supply or stress conditions like transpiration or infection there is a loss of water due to which these cells become flaccid which makes the leaves to curl in so that less surface area of the leaves are exposed. Thus, reducing the loss of water. Once the conditions are favorable these cells again fill up themself with water and re-straighten the leaves. This mechanism is usually seen in grasses.

Additional Information:
1. Bulliform cells minimize the loss of water during stress and unfavorable conditions through the folding of leaves. As the leaves are folded they have less exposed area to sunlight, thus reducing evaporation through the leaf surface and hence conserving the water in plants.
2. Bulliform cells are also known as Hygroscopic or motor cells.
So, The correct option is ‘Leaf of wheat’.

Note: Cactus plants have leaf structures as thorns in order to reduce water loss through leaves. Thus, photosynthesis is performed by the green thick stem of the cactus plant.