Cork cells contain which substance in their cell walls that makes them impermeable to gases and water?
Show answer & explanation
Correct answer: C
Explanation
Correct Answer:
Suberin
Explanation:
Cork cells contain a waxy substance called 'suberin' in their cell walls, which makes them impervious to gases and water. Suberin is a complex structural macromolecule found in the phellem layer (cork tissue) of periderm, providing protection against mechanical injury, pathogen attack, and excessive water loss.
Key Points:
Suberin deposition is a natural waterproofing mechanism found in plant roots (such as in the Casparian strip) and bark tissues.
Cork cells are dead at maturity and are formed by the secondary meristem known as the cork cambium (phellogen).
Unlike cutin, which is primarily found on the epidermal surfaces of leaves and stems, suberin is predominantly located in peridermal tissues.
Important Questions and Answers:
Question: Which plant tissue produces cork cells in woody plants?
Answer: Cork cambium (phellogen).
Question: What is the primary function of suberin in plant cells?
Answer: To prevent water loss and block the entry of gases and pathogens.