Intake of Water and Carbon dioxide:

Phenomena of photosynthesis and osmosis are involved in the intake of carbon dioxide and water by plants.

Intake of Water by root hairs:

The xylem vessels transport water to the leaves using the force of the transpirational pull.

Intake of Carbon dioxide into the mesophyll cells:

The air that enters the leaf through tiny pores (stomata) diffuses into the air spaces present around mesophyll cells. This air carries CO₂, which gets absorbed in the thin layer of water surrounding the mesophyll cells. From here, the carbon dioxide diffuses into the mesophyll cells.