Name a structure found on stems which allow gas exchange.

Name a structure found on stems which allow gas exchange.

• A. Stomata
• B. Guard Cells
• C. Phloem
• D. Lenticels

Answer: (D)

Gas exchange on woody stems happens mainly through lenticels. These are specialized, loosely arranged areas in the bark that form tiny openings, allowing air to diffuse between the internal tissues and the atmosphere. This is crucial for respiration of cells beneath the bark when the outer surface is insulated by bark. Stomata are pores most common on leaves and also on some young stems, but the typical stem structure that enables gas exchange in mature stems is lenticels. Guard cells are the cells that regulate stomata, not a separate stem structure for gas exchange, and phloem is the tissue for sugar transport, not exchange of gases.

Gas exchange on woody stems happens mainly through lenticels. These are specialized, loosely arranged areas in the bark that form tiny openings, allowing air to diffuse between the internal tissues and the atmosphere. This is crucial for respiration of cells beneath the bark when the outer surface is insulated by bark. Stomata are pores most common on leaves and also on some young stems, but the typical stem structure that enables gas exchange in mature stems is lenticels. Guard cells are the cells that regulate stomata, not a separate stem structure for gas exchange, and phloem is the tissue for sugar transport, not exchange of gases.