Question

An element in middle lamella is
(a) Calcium
(b) Potassium
(c) Sodium
(d) Iron

Answer 1

They are a mineral that's necessary for life. Additionally to building bones and keeping them healthy, they enable our blood to clot, our muscles to contract, and our heart to beat. About 99 percent of it is present in our bodies, in our bones and teeth.

Complete answer:
The middle lamella is formed from calcium and magnesium pectates. The plant cell wall is usually organized in three layers and made up of carbohydrates, like pectin, cellulose, hemicellulose, and other smaller amounts of minerals, which make a network alongside structural proteins to make the cell wall. The three major layers are:
- Primary cell Wall - The middle Lamella - The secondary cell wall
During a mature plant cell, it's the outermost layer of the cell wall. In plants, the pectins form a unified and continuous layer between adjacent cells.
The primary cell is situated closest to the within the cell and is the first-formed cell wall. It’s mainly made from cellulose, allowing the wall to stretch for the aim of growth. It’s also comparatively permeable and thinner than the opposite layers. The secondary cell wall is made inside the primary cell wall once the cell is totally grown. Some sorts of cells (especially the cells of xylem tissues) contain cellulose and lignin and these provide additional rigidity and waterproofing. It’s also the thickest layer and permits permeability.
So, the right answer is '(a) Calcium'.

Note: The cell wall is the outer covering of a cell, present adjacent to the cell membrane, which is additionally called the plasma membrane. As mentioned earlier, the cell wall is present altogether in plant cells, fungi, bacteria, algae, and a few archaea. An animal cell is irregular in their shape and this is often mainly due to the shortage of cell walls in their cells. The compositions of the cell wall usually vary alongside organisms.