Proper arrangement of layers in plant cell from inside to outwards is:
Correct answer: B. Secondary wall _ primary wall _ middle lamella
- A. Primary wall _ secondary wall _ middle lamella
- B. Secondary wall _ primary wall _ middle lamella
- C. Primary wall _ middle lamella _ secondary wall
- D. Secondary wall _ middle lamella _ primary wall
Explanation
The correct arrangement of cell wall layers in a plant cell is Secondary wall _ Primary wall _ Middle lamella. The secondary wall is located closest to the protoplast (the living part of the cell), providing structural support. The primary wall surrounds the secondary wall and is flexible, allowing for growth. The middle lamella, which is primarily composed of pectins, is the outermost layer that acts as a glue to hold adjacent plant cells together.In contrast, the other options are incorrect because they misplace the order of the layers. For example, placing the primary wall as the innermost layer or reversing the position of the middle lamella leads to a misunderstanding of the plant cell structure.
This question appeared on the ETEA MDCAT 2009 paper, which you can sit online with every answer explained.
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Animal and plant cells share a plasma membrane, cytoplasm, nucleus, ribosomes, mitochondria and endoplasmic reticulum, but plant cells also have a cellulose cell wall, chloroplasts and a large permanent vacuole. Questions cover organelle structure and function, differences between the two cell types, and how membranes control movement of substances.
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