Question Video: Recalling the Role of Sclerenchyma Tissues in Plants | Nagwa Question Video: Recalling the Role of Sclerenchyma Tissues in Plants | Nagwa

Question Video: Recalling the Role of Sclerenchyma Tissues in Plants Biology • Third Year of Secondary School

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Sclerenchyma tissues have a role only in physiological support. Is this statement correct? Why?

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Video Transcript

Sclerenchyma tissues have a role only in physiological support. Is this statement correct? Why? (A) The statement is incorrect because sclerenchyma tissues are mainly involved in structural support. (B) The statement is correct because sclerenchyma tissues have only a main role in the development and growth of plants. (C) The statement is correct because sclerenchyma tissues are mainly involved in reproduction in plants. Or (D) the statement is incorrect because sclerenchyma tissues do not have any role in plant support.

Generally, we can distinguish between two types of support in plants: structural support and physiological support. Physiological support is temporary, and it depends on maintaining a high volume of water in plant cells to keep their shape. The main structures involved in physiological support are the vacuole, which stores this water, and the cell wall. When there is little water available, water moves out of the vacuole and the cell, which means that physiological support is not given and on a larger scale causes the plant to wilt. However, when there is a sufficient amount of water, the vacuole takes up this water and the cell wall prevents the plant cells from bursting, making them rigid and swollen and on a larger scale causing the plant to stand upright.

Structural support, in contrast, is permanent and involves the deposition of strong polymers into certain cell walls in specific parts of the plant. This maintains the shape of those cells and of the plant as a whole.

There are three types of simple tissue in a plant: parenchyma, collenchyma, and sclerenchyma. The cell walls of cells in sclerenchyma tissue are thick and reinforced with a polymer called lignin and extra cellulose. Sclerenchyma cells are generally found in nongrowing parts of the plant to add structural support to them. For example, sclerenchyma cells can be found supporting the vascular bundles in a stem, which are the plant tissues responsible for transport.

The statement in the question suggests that sclerenchyma tissues have a role only in physiological support. With our acquired knowledge, we know that this is incorrect as sclerenchyma tissue is involved in structural support, not physiological support. Looking at the answer options, we can therefore immediately exclude answer options (B) and (C) as they both state that the statement is correct, which is inaccurate. As we know that sclerenchyma tissues are involved in structural support, we can also eliminate option (D), which suggests that sclerenchyma tissues do not have any role in plant support.

This means that the correct answer is option (A). The statement is incorrect because sclerenchyma tissues are mainly involved in structural support.

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