Q. In a plant organ, which is covered by periderm and in which the stomata are absent, some gaseous exchange still takes place through
A) Aerenchyma
B) Trichomes
C) Pnenumatophores
D) Lenticels
Explanation
Mature stems of woody plants have a peripheral water proof tissue called cork (phellem). A number of scars known as lenticels are found on the surface of cork. Lenticels allow the gaseous exchange between atmosphere and living cells below the cork and also take parts in transpiration (0.1 %).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.