Question

Bulliform cells differ from other cells in being
A. Large, Thin-walled, vacuolate containing water
B. Large, thick walled, contain abundant chloroplasts
C. Small, thick walled, contains starch
D. Small, thin-walled, contain calcium oxalate

Answer 1

Hint: Leaves have the epidermal layer with epidermal parenchymatous cells which protect the leaves from the external factors. There are large cells in them which store the water under the extreme conditions. They alter and maintain transpiration. Monocots and dicots have different features and different types of leaves having different characteristics.

Complete answer:
There are colourless, epidermal cells which are located on the adaxial epidermis of monocot leaf or isolateral leaves. They are called bulliform cells.
They are different from others in the respect of size, structure and function.
They are thin-walled, vacuolated epidermal cells.
Option A: Large, Thin-walled, vacuolate containing water: They are thin-walled large vacuolated cells at the epidermis of the leaves.
Option B: Large, thick-walled, contain abundant chloroplasts: they are thinly walled and do not have chloroplast so the statement becomes wrong.
Option C: Small, thick-walled, contains starch: they have starch but are not thick-walled and small. Rather they are large and thin-walled.
Option D: Small, thin-walled, contain calcium oxalate: they are thin-walled and large, not small in size. They do not have oxalates.

So the answer is option A: Large, Thin-walled, vacuolate containing water.

Note: Bulliform cells store the water and avoid the loss of excess water by maintaining the transpiration. The exposed surface of the leaves maximizes the surface area to allow the water loss during sunlight. Monocot leaves are called the isolateral leaves as they have dorsal and ventral leaves. Their both sides are more and less similar.