Understanding Plant Leaves from Parts and Structures
Leaves - Definition, Parts, Stems, Strands, Structure, Upih, Functions, Example: Leaves are one part of a plant, without its leaves can be practically not a plant. On this occasion here will be a complete lecture about the leaves. Therefore, let us consider the review below.
Leaves Understanding Leaves
The leaf is one of the main organs of plants located on the stem, usually thin and widened rich in chlorophyll, therefore the leaves are usually green. In accordance with the shape of the thin leaf width, the green color and sitting on the stem facing up is in harmony with the function of the leaves for plants, namely:
Taking food substances (resorbsi)
Processing food (assimilation)
Water evaporation (transpiration)
Interpretation (respiration)
Leaf Parts
The complete leaf consists of leaf parts such as the midrib (vagina), stem (petiolus), and leaf blade (lamina). While leaves that do not have one or two of the three parts of the leaf are called incomplete leaves. Complete leaves can be found in several types of plants, for example: banana tree (Musa paradisiacal L), areca palm tree (Araca catechuL), bamboo (Bambusa sp), and others.
Incomplete Leaves Arrangement There are Several Possibilities:
It consists only of stems and strands
commonly called stemmed leaves, this is the most commonly found leaf structure. Most of the plants have such leaves, for example: jackfruit (artocarpus integra merr.) mango (mangifera indica L.) etc.
The leaves consist of upih and strands
such leaves are called leafy leaves or leafy leaves as is commonly found in plants belonging to tribes of grass, for example: rice (oryza sativa L.) corn (Zea mays L.) etc.
The leaves only consist of strands
without upih and stalks, so that the strands are directly attached to or sitting on the stem. Such an arrangement is called a sitting leaf (sessilis), as we can see in the bitch (colotropis gigantean R.Br.).
leaves that only consist of leaf blades can have such a wide base. so that the base of the leaf as if encircling the stem or hugging the stem. therefore also called: leaf hugging the stem (amplexi caulis) like the base of the leaves in tempuyung (sonchus oleraceus L ). the side of the base of the leaf that embraces the stem often wake up rounded and is called leaf ear.
The leaves only consist of stems
and in this case the stalk is usually then flat so that it resembles a leaf blade, so it is a pseudo or fake leaf blade, called: filodia, as found in various types of acacia trees originating from Australia, for example: acacia auricuculifor eg A.cunn.
Additional Or Complementary Tools For Leaves
In addition to the above sections and the possibility of whether or not the parts mentioned above, the leaves in a plant often have additional equipment or complementary include:
And the supporting (stipula)
which is usually in the form of two small leaf-like sheets that are located close to the base of the petiole and are generally useful for protecting young buds. There are times when large and wide leaf support is like a regular leaf and also useful as a tool for assimilation as found in peas. (pisum sativum L). Lean leaves are very easy to fall, such as jackfruit tree (artocarpus integra Merr.), but there are also those that stay long and fall with their leaves. For example on roses (rosa sp). can be distinguished in:
Free leaf support is found on the left of the base of the leaf stalk, called: free leaf support (stipulae liberae) found for example in peanuts (arachis hypogaea L).
Leveraging leaves attached to the left and right base of the petiole (stipulae adnatae) to the rose (rosa sp)
Leveraging leaves are attached together and take place in the armpit of the leaf (stipula axillaris or stipula intrapetioloris).
Leveraging leaves are attached and take place opposite the stem and are usually rather wide to encircle the stem (stipula petiolo opposite or stipula antidroma).
Leveraging leaves that adhere and take place between two leaf stalks as is often the case in plants which in one stem book have two leaves sitting facing each other, for example on the noni tree (morinda citrifolia L). Leaning leaf is thus called: interleave leaf stalk (stipula interpetiolaris).