Question:

Palisade parenchyma is absent in leaves of

Updated On: Jul 3, 2023

mustard
soyabean
gram
sorghum

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The Correct Option is D

Solution and Explanation

Sorghum (family-Poaceae) is a monocot plant. Leaves of monocot don't contain palisade parenchyma as the mesophyll of monocot leaf is not differentiated into palisade and spongy parenchyma. Palisade cells can be found in dicotyledonous plants and also in the net-veined monocots. These are also present in dicots like gram and soybean.

Thus, the correct answer is option D.

Important Notes on Palisade Parenchyma:

Palisade parenchyma is also called palisade mesophyll. Palisade cells contain most of the chloroplasts in plant leaves. These cells are the kind of cells that absorb light required for photosynthesis.
These cells enable photosynthesis to be administered and performed efficiently.
The formation of spongy and palisade parenchyma is usually due to the differentiation of mesophyll cells of the leaf in dicots leaf.
The mesophyll is not seen to be differentiated in monocots.

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Concepts Used:

Anatomy of Dicotyledonous and Monocotyledonous Plants

Dicot Root:

Dicot plants have the taproot system.
The outermost layer is called the epidermis. The epidermal cells sometimes project out which appear as the root hairs.
The epidermis is followed by the multi-layered cortex, loosely made of the parenchyma cells with intercellular spaces.
The inner layer of the cortex is called endodermis, which is tightly packed by the barrel shaped-cells.
Endodermis is followed by pericycle, which are a few layers of thick-walled parenchyma cells.
In dicots, the central pith is not distinct.
There are two to four xylem and phloem.
The xylem and phloem are remarked by a layer of parenchymatous cells known as conjunctive tissue.

Monocot Root:

Monocot roots do not show much difference in the anatomy from that of the dicot roots.

Monocot plants possess an adventitious root system.
As in the dicots, the epidermis forms the outermost layer, followed by cortex, pericycle, endodermis, vascular bundles (xylem and phloem) and pith (random order).
Pith is conspicuous and large.
The number of xylem in a monocot is six or more.
Secondary growth is not seen in the monocot plants.