The outermost layer in a typical plant cell would be_.
Correct answer: C. Middle lamella, if present
- A. Primary cell wall
- B. Secondary cell wall
- C. Middle lamella, if present
- D. Cell surface membrane
Explanation
The cell wall in plants and few algae consists of three important layers: 1) The primary cell wall is the outermost thin, flexible and extensible layer. 2) The secondary cell wall is a thick layer present inside the primary cell wall. 3) The middle lamella is a layer rich in pectins which form plasmodesmata connections between adjacent cell walls. This layer cements the cell walls of two adjacent plant cells. It is the first formed outermost layer (cell plate formed during cell division forms the middle lamella or lamellum). So, the correct answer is 'Middle lamella, if present'
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