Question:

Which of the following tissue is not a component of a complex tissues ?

Updated On: Jun 11, 2024
  • Parenchyma
  • Collenchyma
  • Sclerenchyma
  • Tracheids
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The Correct Option is B

Solution and Explanation

Collenchyma is a simple permanent tissue of refractile nonlignified living cells which possess pectocellulose thickenings in specific areas of their walls. It provides mechanical strength to young dicot stems and does not form any component of complex tissue. Whereas, parenchyma, sclerenchyma and tracheids contribute in complex permanent tissues such as xylem and phloem
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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.