Exchange of gases between air and the internal tissues of older corky stems takes place through.
A. Sieve plates – the septa present between two adjacent sieve tubes, meant for translocation of solutes.
B.Pits – thin areas present on the secondary cell wall, meant for intercellular transportation.
C. Stomata – small pores, present on the epidermis of aerial organs meant for transpiration and exchange of gases.
D.Lenticels – the large sized, slightly raised spots or aerating pores present on the surface of cork, meant for exchange of gases.
So, the correct option is ‘Lenticels’.