Question

The breathing and respiration in woody stem of a plant takes place through :
(a) root hair
(b) lenticels
(c) closed stomata
(d) open stomata

Answer 1

Anwer: (b) Lenticels

Explanation:

Respiration in stems:
In the plans having hard and woody stems and mature roots the exchange of gases takes place through lenticels. Lenticels are actually loosely packed dead cells which are present as small pores on the bark of woody plants or old roots. These enable oxygen to reach the intercellular spaces of the interior tissues and carbon dioxide to be released to the atmosphere by the process of diffusion.