Question:

Dividing cells which are not yet committed to become specific cell type are

Updated On: Aug 8, 2023
  • ground cells
  • epidermal cells
  • meristem cells
  • periderm cells.
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The Correct Option is C

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The term meristem was . coined by C. Nageli (1858) .. It is derived from Greek word meristos which means divisible. ? The meristem cells are immature and undifferentiated cells which remain embryonic in character, i.e., retain the ability to divide.
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Ans: Meristem cells are the ones that are yet not committed to become specific cell types. They are mainly responsible for the growth and regeneration in plants. 

  • As they are not the committed cells, they are actively dividing and give rise to new cells that will differentiate into various types of plant tissues. 
  • These meristems can be apical meristem and lateral meristem.
  • The ones that are located at the tip of the stems or roots are called apical meristem. They help in the upward and downward growth of the plants. 
  • The lateral meristem helps in the secondary growth of the plants. They will increase the girth and thickness of the plants. 
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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.