Gas Diffusion in Plants — NEET Biology
📚 Practice ConceptEach living cell in a plant is located quite close to the surface of the plant. This is true for leaves, you may ask, but what about thick, woody stems and roots? In stems, the 'living' cells are organised in thin layers inside and beneath the bark. They also have openings called lenticels. The cells in the interior are dead and provide only mechanical support. Thus, most cells of a plant have at least a part of their surface in contact with air. This is also facilitated by the loose packing of parenchyma cells in leaves, stems and roots, which provide an interconnected network of air spaces.
Assertion (A): Gas exchange in plants is facilitated by structural adaptations. Reason (R): Tight packing of parenchyma cells prevents gas loss and improves efficiency.
View solution & NCERT explanation
Correct answer: C — If assertion is true but reason is false.
NCERT confirms gas exchange is facilitated by structural adaptations (Assertion true). However, NCERT states “This is also facilitated by the loose packing of parenchyma cells in leaves, stems and roots, which provide an interconnected network of air spaces.” The Reason falsely claims tight packing instead of loose packing (false).
What does NCERT say about Each living cell plant?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.