Question

the walls of tracheids are thick due to decomposition of??​

Answer 1

Answer:

protein

Explanation:

proteins and carbohydrates

Answer 2

The cells which ultimately develop into vessels, tracheids and fibres show the thickening of the cell wall in various ways. This thickening takes place due to the deposition of a hard substance, called lignin, on the inner surface of the cell wall.

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