Question

Lenticels are found in
A. The woody stem for gaseous exchange
B. The root where primary growth has occurred
C. The root as well as stem where secondary growth has occurred for photosynthesis
D. None of the above

Answer 1

The fossil record has shown the first primary mechanism of aeration in early vascular plants to be the stomata, before there was much evidence for the presence and functionality of lenticels. In order to provide a system that was open for aeration and gas exchange in these plants, the growth and increase in the amount of these primitive lenticels was crucial.

Complete Answer:
A transparent tissue made up of cells in the periderm of secondary organs with wide intercellular spaces and the bark of woody stems and roots of flowering dicotyledonous plants is a lenticel. It acts as a pore, providing a path through the bark, which is otherwise impermeable to gases, for the direct exchange of gases between the internal tissues and the atmosphere.

One of the features used in tree identification is the shape of lenticels. Lenticels promote gas exchange of oxygen, carbon dioxide and water vapour in plant bodies that generate secondary growth. During primary growth preceding the development of the first periderm, lenticel formation typically begins beneath stomatal complexes.

Lenticels facilitate the exchange of oxygen, carbon dioxide and water vapour gas in plant bodies that produce secondary growth.During primary growth prior to the production of the first periderm, lenticel formation typically begins under stomatal complexes. The formation of lenticels tends to be directly related to the growth and strength of the shoot and to the tissue hydrose, which refers to the growth and strength of the tissue.

The correct Answer is option (A) The woody stem for gaseous exchange.

Note: Lenticels, very notably on many apples and pears, are also present on many fruits. On European pears, as light lenticels on the immature fruit darken and become brown and shallow from the development of cork cells, they may serve as an indication of when to pick the fruit. Some bacterial and fungal infections may penetrate through their lenticels into fruits, with susceptibility increasing sometimes with age.