Question

Middle lamella mainly contains
A. Ca
B. Mg
C. K
D. Na

Answer 1

Hint: The major component is a compound formed by an element which is present abundantly in dairy products. The element is also a macro element and its deficiency leads to merited degeneration in the root apex.

Complete answer:
First, we will know about middle lamella. It is a thin amorphous cementing layer which joins the two adjacent plant cells. The main component of the center lamella is calcium petite. The structural integrity of the cell is maintained by it. It also prevents the cell from sliding upon one another.
The composition and structure of the cell membrane is as follows-
Cell wall matrix is composed of water, hemicelluloses, pectin, proteins and lipids. Almost 60% is composed of water. The cell wall consists of micro fibrils like cellulose, hemicelluloses. Cellulose is the major component. The cell membrane consists of 4 layers which are middle lamella, primary wall, secondary wall and tertiary wall. The primary wall is elastic and permeable. It is a single layered and outermost part. The secondary wall again consists of three layers. It is made from cellulose, hemicelluloses and pectin. They make the cell wall Impermeable and help in strengthening. The tertiary cell membrane is inner to the storage cell wall. It shows different chemical properties due to the deposition of chemical substances known as xylems. The growth of the cell membrane occurs by accretion.

So, the correct answer is calcium.

Note: Calcium and magnesium both are present within lamella, but the main component present is calcium pectate. Middle lamella is obtained from the cell plate during the cellular division. It acts as a shock absorber. It absorbs mechanical stress.