Passage cells help in the
Passage cells help in the
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Passage cells are endodermal cells without a Casparian strip. This allows comparatively faster movement of water into the stele.
- transport of water towards pericycle
- transport of water towards epiblema
- absorption of water from soil
passage of CO2 towards stomata
The Correct Option is A
Approach Solution - 1
Water moves toward the Pericycle through passage cells. The roots of plants contain passage cells, which may be found in the endodermis and exodermis layers. Passage cells help in transferring water and mineral salts from the cortex into the xylem.
- These modified endodermal cells allow the transport of water.
- They are thin-walled cells and there is no deposition of suberin.
- Passage cells also allow the transfer of solutes such as magnesium and calcium into the stele.
- Exodermal passage cells have a cytoplasm that helps with ion absorption.
- The pericycle is the outermost portion of the stele that is single-layered or multilayered.
- It is found in the monocot root that gives rise to the vascular cambium and cork cambium as well as the dicot root.
- Passage cells are also called transfusion cells.
The functions of a pericycle include -
- As they are thick-walled, they give mechanical support to the plants.
- Pericycle acts as a storage organ when it is made up of parenchymatous cells.
- In dicot roots, the Pericycle forms a part of the cambial ring that gives rise to the secondary tissues.
So the correct answer is option A) transport of water towards pericycle.
Note: Pericycle tissue belongs to the ground tissue system. It is a fundamental tissue system. This tissue system also includes the cortex (below the epidermis), and pith (also known as the medulla).
Approach Solution -2
Passage cells are endodermal cells without a Casparian strip. This allows comparatively faster movement of water into the stele.
- The endodermis is the innermost layer of the cortex and contains passage cells in roots.
- Passage cells or transfusion cells are few endodermal cells with thin walls that appear opposite to the xylem patches.
- Passage cells help to transfer water and dissolved salts from the cortex to the xylem.
So, the correct answer is option A) Passage cells help in the transport of water towards pericycle.
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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.