83. The following statements are made regarding a plant cell:
A. Polysaccharides of various sugars with methyl esters of galacturonic acid are generically referred as chitin.
B. Suberin and cutin are polymers and are mixtures of polyesters of hydroxy fatty acids and glycerol
C. Cellulose is a polymer of glucose and fructose which can be stained by light green and haematoxylin
D. Plasmodesmata maintain continuity between the cytoplasm of adjacent cells and allow large molecules to pass between them without crossing membrane.
Wjich one of the following options represents a combination of correct statements?
(1) A and C              (2) B and C
(3) B and D              (4) A and B

• Introduction

  Plant cells are characterized by specialized structures like the cell wall and intercellular channels that facilitate different functions. Key components like cellulose, suberin, and cutin form the structural and protective barriers, while plasmodesmata enable direct cytoplasmic connections between adjacent cells.

  Explanation of Each Statement

  A. Polysaccharides of various sugars with methyl esters of galacturonic acid are generically referred to as chitin.

  • Incorrect. Chitin is a polysaccharide made of N-acetylglucosamine units, not methyl esters of galacturonic acid. Polymers of methyl esters of galacturonic acid are more related to pectins.

  B. Suberin and cutin are polymers and are mixtures of polyesters of hydroxy fatty acids and glycerol.

  • Correct. Both suberin and cutin are cuticular lipids composed of polyesters derived from hydroxy fatty acids and glycerol, forming protective barriers in plant tissues.

  C. Cellulose is a polymer of glucose and fructose which can be stained by light green and haematoxylin.

  • Incorrect. Cellulose is a linear polymer of glucose units; it is not composed of fructose and is typically stained with specific dyes like Congo red, not light green or haematoxylin.

  D. Plasmodesmata maintain continuity between the cytoplasm of adjacent cells and allow large molecules to pass between them without crossing membrane.

  • Correct. Plasmodesmata are microscopic channels that connect plant cell cytoplasm directly, allowing ions, small molecules, and even larger molecules like proteins to pass freely.

  Summary

  The correct combination is B and D, as they accurately describe plant cell wall polymers and intercellular channels, fundamental to plant cell structure and communication.