Question

Which cells do not have perforated cell walls?
A. Tracheids
B. Companion cell
C. Sieve tube
D. Vessels.

Answer 1

Hint: The German botanist Schleiden proposed that all plants are made up of cells. It is the basic unit of living organisms. Each organ is made up of tissues and each tissue is made up of different types of cell. Each cell in the plants possess a cell wall.

Complete answer: 

In plants, the cell are made up of the organelles like nucleus, endoplasmic reticulum, mitochondria, chloroplast, vacuole, chloroplast, cell wall – primary cell wall and secondary cell wall , plasma membrane, middle lamella, chromatin, cytosol,  etc.

In plants some types of cells are:

Parenchyma cells: It is responsible for metabolic functions of plants. It has only a primary cell wall, when it matures it converts into another type of cell.

Collenchyma cells: It provided flexible support to plants . It lacks a secondary cell wall.

Sclerenchyma cells: It provides strong support to the plant as a steel beam, when it matures and after it dies.

Xylem cells: It is a water conducting tissue, it has two types of cells which are tracheids and vessels. Both have secondary cell walls. Among them, tracheids are elongated and long cells, they do not have perforated cell walls.

-Phloem cells – These contain nutrient transporting cells. Phloem tissue consists of two types of cells, sieve tubes and companion cells and both have perforated cell walls.

Tracheids cells do not have perforated cell walls. So, the correct answer is option (A) Tracheids.

Note: All types of cells mentioned above have perforated cell walls to transport its nutrients except tracheids, because tracheids are elongated, hollow cells, which requires no pores to transport the water between the cells.
Perforated cell wall -The cell wall which contains pores or holes to supply nutrients/ transport the material for lysis to the other cells or intercellular spaces.