Concept explainers
(a)
To distinguish: A primary wall from a secondary wall along with their significance.
Introduction: The plant cell wall is the outer most rigid layer of the cell which is present in plants. The cell wall is composed of four layers that are, the primary layer, secondary layer, middle layer, and tertiary layer.
(b)
To distinguish: The cellulose and the hemicelluloses.
Introduction: The structural components of the plant cell wall consist of cellulose and hemicelluloses. They both are the polysaccharides which are the main constituent of the plant cell wall.
(c)
To distinguish: The extensins and lignin.
Introduction: Extensins and lignins are the components of the plant cell wall that provides mechanical support to the plant. They work along with cellulose and Hemicellulose in providing structural integrity to the plant.
(d)
To distinguish: The desmotubule and annulus.
Introduction: Plasmodesmata is the connecting junction in plants through which cytosolic metabolites are exchanged. Desmotubule and annulus are the components of plasmodesmata that help in the cytoplasmic continuity in the plants.
(e)
To distinguish: A plasmodesmata and gap junction.
Introduction: The multicellular animal cells join with each other to form tissues or organs by using a specialized structure called a cell-cell junction. The common types of these cell-cell adhesions are an adhesive junction, desmosomes, tight junction, and gap junction. In the case of plant cells, the cell junction is called plasmodesmata.
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Becker's World of the Cell (9th Edition)
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