Collenchyma provides elasticity and flexibility to the plant organs and thereby, prevents its breaking when it is bent.

Because collenchyma provides support protection flexibility to plants organs and it is generally absent in roots so it helps leaves and stem to bend without breaking.

The tissue responsible for bending of a stem without breaking it is Collenchyma.

Collenchyma tissue is a type of plant tissue that provides mechanical support to the plant. It is present in the stems, petioles (leaf stalks), and veins of the leaves. Collenchyma cells have thickened cell walls, mainly in the corners where the cells are in contact with each other. These thickened cell walls are made up of cellulose, hemicellulose, and pectin.

Collenchyma tissue is responsible for the bending of a stem without breaking it due to its unique structural features. Here's how it functions:

1. Flexible cell walls:
The primary cell walls of collenchyma cells are flexible and elastic. They have a high proportion of water, which allows them to stretch and bend without breaking. This flexibility is crucial for the movement and growth of the plant.

2. Irregular arrangement:
Collenchyma cells have an irregular arrangement, with intercellular spaces between them. This arrangement provides flexibility and allows the stem to bend easily. The intercellular spaces also allow for the exchange of gases and nutrients between cells.

3. Strengthening the stem:
The thickened cell walls of collenchyma cells provide mechanical strength and support to the stem. They are particularly concentrated in the corners of the cells, which helps to reinforce the stem and prevent it from breaking under stress or bending forces.

4. Growth and development:
Collenchyma tissue is also involved in the growth and development of the plant. It is found in regions of active growth, such as the growing tips of stems and roots. The flexible nature of collenchyma cells allows them to accommodate the elongation and expansion of the plant as it grows.

In conclusion, collenchyma tissue is responsible for the bending of a stem without breaking it due to its flexible cell walls, irregular arrangement, and strengthening properties. It plays a vital role in providing mechanical support and facilitating the growth and development of the plant.