Gaseous Exchange In Plants

 

Gaseous Exchange In Plants

Plants have no organ or system for the exchange of gase with the enviroment every
cell of the plant body exchanges gases with the enviroment by its own.

 

Stomata

These are small opening in the walls of the leaves.the leaves and young stems have stomata
in their epidermis.The gaseous exchange occurs through these stomata.

 

The machanism of gaseous exchange in leaves

The inner cells of leaves and stem also have air spaces among them which helps in the
exchange of gases.

 

Gaseous Exchange in stem

In woody stem and mature roots,the entire surface is covered by bark which is imprevious
to gases or water.However,there are certain pores in the layer of bark.These are called
lenticels.

 

Gaseous Exchange in roots

Gases diffuse in and out of the general surface of young roots the gases are found in soil
surrounding the roots.