Pores called stomata, which open and close by guard cells.
Leaves
Light.
Substances pass in and out of stomata through diffusion and active transport. Water and gases like CO2 and O2 enter and exit the stomata to support photosynthesis and respiration in plants. This exchange of substances helps regulate plant water balance and the exchange of gases necessary for plant metabolism.
The gas for photosynthesis...carbon dioxide diffuses into the plant through its stomata ('holes' in the leaf's underside). Water is transported through the plant in the xylem tube (waterproof tube that makes up part of the plants veins and covers the whole plants structure) as it is drawn up from the roots where it is absorbed. It is drawn up by the water evaporationg through the stomata. The light obviously enters the leaf and enters the chloroplasts where it combines with the chlorophyll to provide the energy for the photosynthesis reaction. The products from photosynthesis...glucose and oxygen are removed from the plant leaves. Glucose through the phloem tube (another of the veins) and oxygen through diffusion through the stomata or it is used up in respiration.
the phloem transports organic substances made by photosynthesis throughout the plant, mainly sucrose
Oxygen and sunlight.
chlorophyll does not enter the plant, sunlight does.
Water and CO2 is entered. Products are glucose and Oxygen.
I n a plant the substances in sugar are cellulose,sugars which is glucose.
Gas, nutrients, and water would not be able to enter a leaf if it were coated with wax. The waxy layer would create a barrier that prevents the entry of these substances, which are essential for the leaf's photosynthesis and overall functioning.
Carbon dioxide enters the plant through tiny openings called stomata on the leaves during the process of photosynthesis.
pores in the leaves and stomates allow gases to enter and leave the plant