Suberin is a waterproof waxy substance found in plants. it is the major constituent of cork.

function = acts as a barrior of movement of water...
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The correct answer is option 'C', suberin.


Cork cells are specialized cells found in the outer bark of the cork oak tree (Quercus suber). These cells have unique characteristics that make them impervious to water and gases. This imperviousness is mainly due to the presence of suberin.

What is suberin?
Suberin is a waxy substance that is found in the cell walls of cork cells. It is a complex polymer composed of fatty acids and phenolic compounds. Suberin is highly hydrophobic, meaning it repels water, and it also acts as a barrier to the diffusion of gases.


Suberin plays a crucial role in making cork cells impermeable to water and gases. Here's how it works:

1. Waterproofing: Suberin forms a water-impermeable layer in the cell walls of cork cells. This prevents water from entering or leaving the cells, protecting the underlying tissues from dehydration or excessive water uptake.

2. Gas exchange regulation: Suberin restricts the movement of gases through the cork cells. This is important because cork cells are part of the outer protective layer of the plant and need to prevent excessive water loss and gas exchange. By limiting the diffusion of gases, suberin helps the plant maintain an optimal balance of gases inside the cells.

3. Protection: The presence of suberin in the cell walls of cork cells provides physical protection against mechanical damage, pathogens, and pests. It forms a tough, durable, and elastic layer that helps safeguard the underlying tissues.

4. Insulation: Suberin also provides thermal insulation to the plant. The waxy nature of suberin helps reduce heat transfer and prevents temperature extremes from affecting the inner tissues.

Overall, the presence of suberin in cork cells is essential for their function as a protective barrier against water loss, gas exchange regulation, physical protection, and thermal insulation. It allows cork cells to fulfill their role in the outer bark of the plant, providing protection and support to the underlying tissues.