Question

Pit membrane of a simple pit is composed of
A. Secondary cell wall
B. Middle lamella
C. Primary cell wall
D. Both B and C

Answer 1

Hint:The pit membrane: It is the primary cell wall and contains the middle lamella, or it is the membrane that is placed between adjacent cell walls, and also at the middle of the pit chamber.
The primary cell wall which is at the pit membrane may also have depressions same as that of the pit depressions of the secondary layers.

Complete answer:
Pits are comparatively the thinner portions of the cell wall that communicates with the and exchange the fluid through it.
Pits are considered as the characteristic of cell walls that are with secondary layers.
Mainly each and every pit has a complimentary pit opposite of it in the neighboring cell.
These complementary pits are regarded as "pit pairs"
Pits are discontinuities in the secondary cell wall. There are two main types of pits
1.Simple
2.Bordered.
All pits have two essential components
1.The pit cavity
2.The pit membrane.
In the simple pit, the cavity is nearly the same based upon the width.
In the bordered type of pit, the cavity narrows towards the cell lumen, and typically, the membrane is curved over by the secondary cell wall.
The pit membrane consists of a primary wall and middle lamella.

So, the correct option is option A.Secondary cell wall.

Note: Pits are composed of three parts: the pit chamber, the pit aperture, and the pit membrane.
The pit chamber is the empty area where the secondary layers of the cell wall are not found.
The aperture of the pit is the opening which is at either end of the pit chamber.