EXCHANGE OF GASES IN PLANTS

IDENIFY THE PICTURE AND LABEL THE PARTS

STOMATA

• Stomata are minute aperture structures on plants found in leaves

• They consist of two specialized cells, called guard cells that surround a tiny pore called a stoma

• A stoma is a tiny opening or pore that is used for gas exchange

• Air enters the plant through these openings

Gas exchange through stomata• The air required for respiration enters the

plants through the stomata• Stomata are seen the on the leaves and the

tender green stem• Air that enters through the stomata diffuses

into the intercellular spaces and then into the cell

• It is the oxygen in this air that is used by plants for respiration

• The carbondioxide formed due to respiration is expelled in the same manner

Gas exchange through stomata

Identify the figure

Lenticels

• A lenticel is a porous tissue consisting of cells with large intercellular spaces in the bark of woody stems.

• These structures allow for the exchange of gases between the internal tissues and atmosphere .

• Regions of lenticels appear as small projections on the outside of the old stem.

Gas exchange through lenticel

• Air also enters and goes out of the plants through lenticels.

• Lenticels are for gaseous exchange after secondary thickening.