Leaves
Type of leaf leaf
(a) Compound leaves.
(b) Type of venation.
Simple leaf
Trifoliate
Pinnate
Type of leaf margin.
Type of leaf arrangement on stem.
The colour of leaf.
The texture ofleaf; whether hairy or smooth.
GASEOUS EXCHANGE IN LEAVES OF TERRESTRIAL PLANTS
Gaseous exchange takes place by diffusion.
The structure of the leaf is adapted for gaseous exchange by having intercellular spaces that are filled.
These are many and large in the spongy mesophyll.
When stomata are open, carbon(IV)oxide from the atmosphere diffuses into the substomatal air chambers.
From here, it moves into the intercellular space in the spongy mesophyll layer.
The CO2 goes into solution when it comes into contact with the cell surface and diffuses into the cytoplasm.