Gum is secreted from which layer of gum tree 1)Dermal layer. 2)Cortical layer. 3)Medullary layer. 4)All the above
Answers
Answer: 1)Dermal layer
Explanation:
Dermal layer
The dermal tissue system - the epidermis - is the outer protective layer of the main plant (roots, stems, leaves, flowers, fruits and seeds). The epidermis is usually the thickness of a single cell layer, and its cells are free of chloroplasts.
As accustomed to the terrestrial habitat, the epidermis has altered certain components that control the loss of water, carbon dioxide, and oxygen. Cutin and wax are oily substances that are embedded in the walls of epidermal cells, forming a waterproof outer layer called the cuticle. Typically, epicuticular waxes, in the form of sheets, sticks, or fibers, are applied to the cuticle, making some “bloom” leaves white, green, or blue. The cuticle and epicuticular waxes reduce respiration from the plant. Waxy deposits can be thin or thick, depending on the needs of the plant; for example, desert plants often have heavy layers of wax.
However, the plant must have some way of exchanging water vapor, carbon dioxide, and oxygen for this cuticle line. Scattered throughout the bound epidermis, the protective cells contain chloroplast, and between each pair a small hole, or hole, is formed, called a stoma (plural: stomata). When two guard cells are turgid (swollen with water), the stoma is opened, and, when the two guard cells are dispersed, it is closed. This controls the movement of gases, including evaporation from air, in the atmosphere. Observatory cells and stomata are found in parts of aerial plants, usually on leaves, but are not known to occur in aerial roots.
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