Which is the outermost protective layer of a typical young dicotyledon...
The epidermis is the outermost protective layer of a typical young dicotyledonous stem. It is covered with a thin layer of cuticle and may bear trichomes and stomata. The epidermis provides protection to the stem against physical damage and helps in reducing water loss through transpiration.
Which is the outermost protective layer of a typical young dicotyledon...
Epidermis
The epidermis is the outermost protective layer of a typical young dicotyledonous stem. Let's delve into why the epidermis is the outermost protective layer.
Function of Epidermis:
- The epidermis acts as a protective barrier, preventing water loss, physical damage, and invasion by pathogens.
- It also helps in the exchange of gases and regulates the movement of water and minerals into and out of the stem.
Structure of Epidermis:
- The epidermis is made up of a single layer of closely packed cells.
- The outer walls of these cells are often covered by a waxy cuticle, which further helps in reducing water loss.
Specialized Cells in Epidermis:
- The epidermis may contain specialized cells such as stomata, which are responsible for gas exchange, and trichomes, which provide protection against herbivores and reduce water loss through transpiration.
Comparison with Other Tissue Layers:
- The cortex, endodermis, and pericycle are internal layers of the stem that provide structural support, storage, and transportation of water and nutrients.
- The epidermis, being the outermost layer, plays a crucial role in protecting these internal tissues.
In conclusion, the epidermis is the outermost protective layer of a typical young dicotyledonous stem, serving vital functions in protection, gas exchange, and regulation of water and mineral movement.
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