Question:

Which of the following statement is true?

Updated On: Jul 27, 2022

Vessels are multicellular and with wide lumen
Tracheids are multicellular and with narrow lumen
Vessels are unicellular and with narrow lumen
Tracheids are unicellular and with wide lumen

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The Correct Option is A

Solution and Explanation

Vessels on trachea are multicellular, made up of a row of cells (called vessel elements), placed one above the other, with their intervening walls absent or variously pored. The length of the trachea rarely exceeds $10\, cm$, though they may attain a length of two metres as in Quercus and $3-6$ metres as in Wistaria and Eucalyptus. The wall of vessels are lignified and hard, but not very thick. The cell cavity or lumen is wide. The thickenings may be annular, spiral, scalariform, reticulate and pitted.

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Notes on Anatomy of Dicotyledonous and Monocotyledonous Plants

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.