AP BIOLOGY

Detailed explanation-1: -Lenticels are small pores on the surface of the stems and roots of plants. The exchange of gases like carbon dioxide and oxygen takes place in the stems and roots through the cells of lenticels by diffusion.

Detailed explanation-2: -Lenticels permit the exchange of gases between the environment and the internal tissue spaces of the organs (stems and some fruits) (Fig. 6.2). They permit the entrance of oxygen and simultaneously the output of carbon dioxide and water vapor.

Detailed explanation-3: -In many annual plants, the stems are green and almost as important for photosynthesis as the leaves. These stems use stomata rather than lenticels for gas exchange.

Detailed explanation-4: -A lenticel is a porous tissue comprising cells with huge intercellular spaces. They are found in the periderm of secondarily thickened structures, the bark of woody stems, and the roots of dicotyledonous flowering plants.

Detailed explanation-5: -A lenticel is a porous tissue made up of vast intercellular gaps between cells. On stems and roots, lenticels appear as elevated circular, oval, or elongated patches. Lenticels allow gases to pass between the atmosphere and the organs’ interior tissues.