(a) How does carbon dioxide from the air enter the leaves of a plant to be used in photosynthesis? (b) How does water from the soil reach the leaves of a plant to be used in photosynthesis?

(a) Carbon dioxide from the air enters the leaves of a plant to be used in photosynthesis by the small pores present on the leaves called stomata. Stomata are the tiny pores on the leaves which play a major role in the exchange of gases. The intake of carbon dioxide and the outgoing of oxygen both takes place through these pores.

(b) The water from the soil reaches the leaves by the tissue called Xylem. The root hairs on the root absorb water from the soil and through osmosis the water is transported to leaves through the tissue xylem. Xylem is the fundamental tissue for the transportation of water in plants.