Structure and Function Leaves

Structure and Function Leaves

Did you ever see the leaves with various forms? Already instead? Yes indeed leaves the various types and none of the same leaf. Although the leaves come from the same tree the leaves still have differences with the other leaves. We will see the structure of the leaves from the outside to the inside, then the function of the leaves, and the subsequent transport system in the leaves.
1. Structure of Leaves

Leaf structure can be differentiated into two, namely morphology (strktur outside) and leaf anatomy (structure in) leaves.
a.Morfologi (External Structure) Leaves

In general, green leaves. The green color of the leaves is caused by the content of chloroplasts in leaf cells. In the chloroplasts contained chlorophyll. In morphology, in general leaves have other parts of the leaf blade (lamina) and petiole (petiolus).

There are parts of the petiole attaches to the stem base of the petiole yag called. In monocots tubuhan leaf, the leaf base shaped flat and wide and wrap the stems. The base of the leaf is called the leaf midrib. Examples of leaf midrib present in bananas and taro plants.

Leaves that have all three parts, namely leaf midrib, petiole and leaf blade leaves also called perfect. But leaves that do not have one or more of the leaf is called the leaf is not perfect.

Try to compare between the leaves of mango and star fruit leaf is there a significant difference? Surely striking difference is the arrangement of leaves on a stem is not it? Leaves that have only one leaf is called a single leaf, mango leaves and leaf sample that has more than one leaf on the stem called mejemuk leaves, leaf samples starfruit. Mejemuk there are pinnate leaves and some are menjari. Pinnate compound leaves are pinnate there are single and double.

In dicotyledonous plants generally have a bone or menjari pinnate leaves. While tembuhan monocots have leaves with parallel leaf or curved spine.
b. Anatomy (Structure In) Leaves

Basically, the anatomy of the stem leaves the same when observed under a microscope will appear parts ranging from the top of the epidermis, tissue mast (palisade), spongy tissue (spongy) and beam transport vessel leaves.

     Leaf epidermis is the outermost layer of the leaf top and bottom. Cypress leaf epidermis consists of layers of epidermal cells that do not have a space between cells. Leaf epidermis serves to protect the upper and lower than the cell. To prevent excessive evaporation of water that, in general, and has a layer of wax or fine hair. Among the cells of the epidermis are stomata (leaf mouth) which serves as a gas exchange. Stomata are generally found on the underside of leaves, but the location of the water plant stomata at the top of the leaf.
     Network poles (palisade) is a collection of cells cylindrical, upright, compact, and contain chloroplasts. Palisade tissue located below the epidermis and at this pole occurs photosynthetic tissues.
     Spongy tissue (spongy) is a network of irregular shape and no space between cells. Networks are not meeting serves to store carbon dioxide for photosynthesis.
     Beam transport vessels contained in the bones of the leaves. Vein system is a continuation of the vascular system transports the stem or branches and roots of transport vessels. The section is a branch of the central cylinder which is a branch of the central cylinder rod.

2. Function Leaves

Leaf is one of the important parts of the plant due to its functions as the site of photosynthesis, tranpirasi, and a respirator. In some plants, the leaves also serves as a means of vegetative propagation.

     Place photosynthesis. The main function of the leaf is as a place of photosynthesis. Starting from the water absorbed by the roots and leaves sanpai continue. Mineral water and then into the leaf mesophyll tissue mainly to the palisade tissue. The water is used for photosynthesis and partly for the evaporation process. The results of photosynthesis in the form of sugar (glucose) and oxygen. Glucose result of photosynthesis will be transported by filter vessels and circulated to all parts of the plant. Oxygen is removed through the stomata of the leaves and partly used for respiration in the leaf cells.
     Place tranpirasi plants. The leaves also play an important role in transpiration. Transpiration is the evaporation events in plants. Transpiration can take place in the trunk, but generally occurs in the leaves. Through transpiration, water and vegetation in the form of water vapor will be released through the stomata into the air. The existence of transpiration causes water and minerals from the roots, stems, leaves and stalks persist. In addition, transpiration also serves as a temperature control plants. Rate of transpiration in plants is influenced by internal factors (inside) and external (outside). Factors in affecting, among others, the size of leaves, number of stomata, there todaknya layer of wax on the surface of the leaf, and the extent of hairs (trichomes) on the leaf surface. External factors that affect, among others, temperature, humidity, light intensity, and the state of water in the soil. When humid air transpiration in plants disturbed. In these circumstances the plants excrete excess water in the form of droplets of water that we can during the morning. Water dripping event is called also Guttation or hatching.
     Respiration (breathing). Through the stomata of oxygen from the outside into the plant. Oxygen into the use of plants to perform respiration. Respiration aims to get the energy contained in food. Through the process plant also produces carbon dioxide and water vapor are removed through leaf stomata.
     Vegetative propagation tool. have you ever seen a duck cocor plants? This plant is often used into plants and that interest is the leaves that become vegetative propagation tool. In the leaves of plants such as duck cocor this, can produce new individuals so that it serves as a tool leaves of vegetative propagation.