Question

Complete pit is
A) Depression in secondary wall
B) Pit chamber and primary wall
C) Pit chambers of two adjacent cells and pit membrane
D) Pit chamber, primary wall and middle lamella

Answer 1

Hint: Pits are the thinner portions of the cell wall which is immediately adjacent to the cells and thus it can be used to communicate or exchange fluids through them. Pits has its own criteria which is available in the cell walls with secondary layers. These secondary layers are the structural layers outside of the cell membrane. They are eventually rigid, flexible and tough. Consequently, they provide the plants the protection and in cases where it is necessary, it allows fluid transmission too.

Complete answer:
We know that the pits are thinner regions in the secondary cell wall which allow the adjacent cells to communicate or exchange fluid through them (like vessels and tracheids of xylem tissues). Pits has its own criteria which is available in the cell walls with secondary layers. These secondary layers are the structural layers outside of the cell membrane. They are eventually rigid, flexible and tough. Consequently, they provide the plants with protection and in cases where it is necessary, it allows the fluid transmission too. Each pit consists of complementary pits opposite its neighbouring cells and the complementary pits are known as ‘pit pairs’.
Pits consist of three parts
Pit Chambers which are hollow areas and the secondary cell walls could not be seen there.
Pit Aperture openings are both ends of the pit chamber.
In the middle of the pit chamber, between the adjacent cell walls, the Pit Membranes can be found.

Here, the correct answer is option ‘C’, i,e. 'Pit chambers of two adjacent cells and pit membrane'.

Note:Through the depression occurred in the secondary cell wall, the pit is formed. The Primary cell wall and middle lamella constitute pit membrane. Pit membrane’s middle lamella stays at the middle portion of the pit chamber.