Question

In monocot leaf
(a) Bulliform cells are absent from the epidermis
(b) Veins form a network
(c) The mesophyll is well-differentiated into these parts
(d) The mesophyll is not differentiated into palisade and spongy parenchyma

Answer 1

Hint: The leaves are usually described as isobilateral leaves because these are approximately similar in the structure on both the surfaces i.e. the upper surface and the lower surface of the leaf.

Complete answer:
Monocots leaves are also called isobilateral leaves and their both adaxial and abaxial epidermal surfaces bear stomata. There is no differentiation of the mesophyll layer into palisade and spongy parenchyma in these leaves and it is just a simple layer. The mesophyll is a layer of chlorophyll-containing parenchymatous cells that is present between the epidermal layers of the leaves. The cells present in this layer are spherical or angular with only a few or no intercellular spaces that mean the cells are compactly arranged and tightly packed. Maize, rice, grass, wheat, etc. are examples of monocot plants that have such leaves.
In monocot leaf, the epidermis is single-layered and is present on the upper as well as lower surfaces of the leaf, and both the epidermal layers contain stomata. There is a thick layer on both epidermal layers known as the cuticle. The vascular bundles are collateral and closed type in the monocot leaves and each one is surrounded by bundle sheath which is a layer of thin-walled parenchymatous cells.
So, the correct answer is ‘Mesophyll is not differentiated into palisade and spongy parenchyma’.
Note: Bulliform cells are present in the monocot leaves and these cells are developed from the adaxial epidermal cells. The veins in these leaves do not form networks and are arranged linearly but they do so in dicot leaves.