Vascular Plants · Botany

Lignin is a complex polymer that is primarily deposited in the cell walls of:

  1. Sieve tubes and phloem parenchyma
  2. Companion cells and cortical parenchyma
  3. Mesophyll cells
  4. Xylem tracheids and vessels
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Correct answer: Xylem tracheids and vessels

Lignification provides the necessary rigidity and waterproof properties for water-conducting cells. It allows the xylem to withstand the negative pressure of transpiration without collapsing.

Difficulty: Medium Question 14 of 20

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