DENDROLOGY

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

Detailed explanation-2: -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-3: -Lenticels are found in the woody trunk or stem of plants. A lenticel is a spongy area present in the woody surfaces of stems. It appears as a lens-shaped spot which acts as a pore. They allow for the exchange of gases between the internal tissues and the atmosphere.

Detailed explanation-4: -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. In apple fruit, lenticels account for up to 21% of the transpiration.

Detailed explanation-5: -Lenticels are lens-shaped openings or large intercellular spaces in the periderm, bark of woody stems and roots of dicot plants. They facilitate the exchange of gases from the internal tissues to the outside environment. The shape of lenticels is a key feature in the identification of trees.