Introduction to Plant physiology; Plant's Organ; Stem, Its Anatomy, Tissues And Function, Plant Physiology | semester-1, Bs Applied Biosciences.

 

Stem:

• Stem is the organ of the plant that is above ground.
• its function is to support fruits and the leaves.
• through xylem and phloem it conduct water to the whole plant.

Stem's Anatomy:

• stem internal structure shows it has dermal tissues , vascular tissues and the ground tissues.

Types of the Stem:

• there are the two types of the stem like herbaceous stem and the second one is the Woody stem.

Tissues of the Stem:

• outermost layer that is made up of dermal tissues like epidermis cells.
• it provides protection to the plant body.
• stem's epidermis has waxy cuticle, that's function is to prevent from water loss.
• stem on their epidermis has hair like trichome that is used for protection and than releases scant and oil etc.

Stem vascular tissues:

• in stem vascular tissues is composed of xylem and phloem.
• here xylem is used for the conduction of water.
• while phloem is used for the conduction of food and provides support to the plant.

Vascular Cambium:

• vascular cambium is basically present in the woody stem.
• vascular cambium is basically present between xylem and phloem mean among vascular bundle.

Vascular tissue in case of trees:

in case of tree vascular tissue located on the outer most layer of the tree.

Formation of ring by the vascular tissue in the trees:

• Annual ring: in which xylem which will formed by the vascular cambium in one growing season
• its mean one growing season one ring.

History of the tree annual ring:

Tree time- keeping is called Dendrochronology.