Gas exchange can occur in several ways for most plants. The leaves and young stems of plants have openings in the epidermis controlled by guard cells. The openings are called stomata. Carbon dioxide from the atmosphere will diffuse through the stomata and oxygen diffuses out into the air. They are normally open in the day light and closed at night. Trees with bark may have spongy layers in the bark called lenticels allowing gas exchange. Gas exchange will occur through the moist epidermal layers of the young roots. Oxygen from the soil will diffuse into the cells while carbon dioxide diffuses out of the cells into the soil. Plants submerged in water will have gases diffuse in and out of the cells from the water. Cypress trees have "knees" for obtaining oxygen in water logged soils. The knees emerge above the water into the air.
It is because Co2(carbon dioxide) is transferred to the plant and the plant makes the Co2 Oxygen.
simple diffusion
Gaseous exchange and evaporation of water vapour
Gaseous exchange takes place when the volume of the chest cavity is increased or decreased.
During the stage of photosynthesis, the exchange of gases occur in the leaves.
in the leaf
Help in gaseous exchange
gaseous exchange
The gaseous exchange is hampered.
The spongy layer in a plant leaf facilitate better gaseous exchange for photosynthesis and respiration.
Leaves are very important plant part as these perform gaseous exchange and photosynthesis
because leaves play crucial role in photosynthesis and gaseous exchange