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Question

Pit membrane is made of

A
Plasmalemma
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B
Primary wall
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C
Middle lamella
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D
Both B end C.
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Solution

The correct option is C Both B end C.
Pits are thin portions of the cell wall that adjacent cells can communicate or exchange fluid through. Pits are characteristic of cell walls with secondary layers. Generally, each pit has a complimentary pit opposite of it in the neighbouring cell. These complementary pits are called "pit pairs". Pits are composed of three parts: the pit chamber, the pit aperture, and the pit membrane. The pit chamber is the hollow area where the secondary layers of the cell wall are absent. The pit aperture is the opening at either end of the pit chamber. The pit membrane is the primary cell wall and middle lamella, or the membrane between adjacent cell walls, at the middle of the pit chamber.
So, the correct answer is Both B and C'.

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