Question

Which tissue makes the plant hard and stiff?
A) Parenchyma B) Sclerenchyma C) Collenchyma D) Xylem

Answer 1

Answer:

Explanation:

The tissue which provides support and mechanical strength to a plant or a growing organ in a plant is known as a mechanical tissue.  

Both the ground tissues- collenchyma (living)  and sclerenchyma (dead) provide maximum mechanical strength to a plant.

Collenchyma mainly provides mechanical strength to the growing plant parts.

The cell wall of collenchyma is made up of- pectin, hemicellulose, protein and cellulose.  

These thickening materials get deposited at the corners or at the tangential walls of collenchyma cells.

It is a living cell which retains protoplasm even at maturity.

Due to the presence of hydrated pectin in the walls of collenchyma cells, they also provide elasticity to the cell.

Sclerenchyma is the tissue which makes the plant hard and stiff. Sclerenchyma is the supporting tissue in plants.

So, the correct answer is 'Sclerenchyma and Collenchyma'.

Answer 2

Answer is just B) Sclerenchyma