Tissue in Plant Organs

Tissue in Plant Organs
Cork network
Cork tissue is a network composed of cork cells. This network functions to protect the underlying tissue from losing too much water.

1. Network on the Root
Tissue in the transverse incision of the root (young roots) is visible from the outside in, namely the epidermis, cortex, endodermis, and stele.
a. Epidermis
The cells are tightly arranged, as thick as a single cell, and have no intercellular space, the cell walls do not experience thickening and can be passed through water and mineral salts.
b. Cortex
Located under the epidermis, consisting of layers of thin-walled cells, the composition is not dense, a lot of space between cells that are important for the exchange of substances.
c. Endodermis
Namely the innermost layer of the cortex, consisting of one layer of cells, and at the same time as a separator between the cortex and the central cylinder, the cells are arranged tightly without space between cells. Endodermic cells generally experience thickening of the U-shape, and some of them do not experience thickening which is referred to as a pelalu cell or successor cells which act as a pathway for the entry and exit of water and mineral salts.
d. Stele / center Cylinder
Is the deepest part of the root, consisting of:
1) Perisicles or pericambium, the outer portion of the stele.
2) Transport vessels, consisting of xylem and phloem.
3) Parenchymal tissue, a filling tissue between the bundles of transport vessels, thin-walled does not experience thickening and cytoplasm.

2. Network on the Stem
Simply stated, the tissue in the transverse incision of the stem (young stem) from the outside to the inside is as follows:
a. Epiermis, consisting of a layer of cells that are tightly arranged and do not have space between cells.
b. The cortex, which is the inner skin part of the epidermis which is composed of parenchymal tissue and has a lot of space between cells.
c. Endodermis / fluterma, is a separator between the cortex and the central cylinder.
d. Stele / central elinder is the inside of the stem.

Network functions on the stem include:
as a supporter or enforcer of the plant body a place to transport water and mineral salts (xylem) and transport the products photosynthesis (phloem).
Food storage place, stored in cells, especially parenchyma cells.

3. Leaf tissue
In transverse incisions of the leaf, epidermal (upper and lower) tissue can be found, mesophyll tissue or leaf flesh, and leaf bone tissue or leaf veins.
a. Epidermis
Composed by one layer of cells whose cell walls are thickened from the cuticle or from lignin. In the epidermis (generally the lower epidermis) there is a gap flanked by two closing cells, this gap is called a stoma (leaf mouth). Among the leaf epidermis are additional tools such as trichomes (leaf hair).
b. Mesophyll
Consisting of cells parenchyma. The long, tightly arranged parenchyma cells are called palisade tissue or network of poles / fences. The parenchymal cells under the palisade are arranged in tenuous spaces with a lot of space between cells called spongy tissue or spongy tissue. Both of these parenchymal tissues contain a lot of chloroplasts.
c. Bone leaves
Leaf bone or leaf veins (branches of the leaf bone), consisting of xylem and phloem transport vessels and parenchyma.

Organs and Organ Systems in Plants
Organs and Organ Systems in Plants
Organs in plants include:
Root functions include:
Strengthening the establishment of the stem, the depth, and breadth of the roots are proportional to the height and shade of the leaves
In some plants roots function to store food reserves
To absorb water and minerals in the soil