What are the three parts that the leaves of a plant are generally made up of?

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The leaves of plants are generally made up of (Blades, petioles, leafletsComposed of three parts.

These three parts are possessed and are called complete leaves. Whereas, a leaf that lacks any or both of these parts is called an incomplete leaf.

Leaves are the most important components of leaves, mostly thin green flat bodies, this thin and flat form, with a large surface area, can shorten the distance between mesophyll cells and the leaf surface, and the leaf veins that play a supporting and conductive role are also in a network state. These characteristics are conducive to gas exchange and light energy absorption, the transport of water and nutrients and the output of photosynthetic products, and are perfect adaptation to photosynthesis and transpiration.

The petiole is the stalk-like part that follows the base of the leaf, and its lower end is connected to the branch. The main function of the petiole is to guide and support, the petiole can twist and grow, thereby changing the position and direction of the leaves, so that the leaves do not overlap each other, and can fully receive sunlight, this characteristic is called leaf mosaic.

The pedicle is an appendage at the base of the petiole and is often born in pairs. Its shape and function vary depending on the plant species, in addition to the protective effect on young leaves, some green leaves can also carry out photosynthesis.

The leaves of grasses are different from the leaves of general plants, and it is composed of two parts: leaves and leaf sheaths. The leaves are linear or band-shaped, with longitudinal parallel veins. The leaf sheath is long and narrow and holds the stem, which has the role of protection, support and conduction.

Components of leaves.

The leaves of plants are generally composed of three parts: leaves, petioles and supporting leaves, if these three parts are called complete leaves, and if any part is missing, it is called incomplete leaves, and most of the leaves of plants are incomplete leaves.

The leaves of plants are generally composed of two parts: petioles and leaves.

The components of plant leaves are leaf receptacles, petioles, and leaves.

Although the morphology of the leaves is diverse, the basic composition is the same. It is composed of three parts: petioles, veins, and leaves. The leaves that all three parts have are called complete leaves, such as the leaves of peach trees, willows, moons, and other plants.

Some plants have leaves that have only one or two of these parts, which are called incomplete leaves. For example, cabbage leaves, which do not have supporting leaves.

The main component of the leaf is generally a thin green flat body, with an upper surface and an lower surface. The whole shape of the leaf is called the leaf shape, the tip is called the leaf end or the tip of the leaf, the base is called the leaf base, the periphery is called the leaf margin, and there are leaf veins distributed in the leaf.

The petiole is the part of the leaf and stem that connects to each other, and is generally cylindrical, semi-cylindrical, or slightly flattened. The pediment is an appendage of the base of the petiole and is often born in pairs on either side of the base of the petiole. It also comes in a variety of shapes.

Like pears and mulberry trees, the leaves are relatively small and linear. The leaves of peas are large and leaf-like.

The leaf is mainly composed of three parts: epidermis, mesophyll and vein.

Epidermis: It is a new epidermis, usually divided into upper and lower epidermis, the upper epidermis on the abdomen and the lower epidermis on the back. Epidermal cells are flat and dense, often without chloroplasts, and often have a layer of keratin on the outer layer.

Some epidermal cells usually differentiate into stomata, or they stick outward, forming villi.

Mesophyll: is a type of parenchyma cell that has been assimilated, and is generally divided into the following two categories. (1) Fence organization:

Located in the lower part of the epithelium, the cells are generally 1 several, long and cylindrical, perpendicular to the epidermal cells, tightly forming a grid, containing more chloroplasts. In bihedral or needle-shaped leaves, there are also palisade-like tissues that are present above or on the peripheral margin of the lower epidermis, but there are also some aquatic and shade plants that have no palisade structure on their leaves.

2) Sponge tissue: The cell morphology is mostly irregular, containing a small amount of chloroplasts, under the fence tissue, the structure is not clear, the structure is loose, like a sponge.

Veins: Vascular bundles pass through the mesophyll. The vascular bundles of the main vein are thicker, while the vascular bundles of the lateral veins and minor veins are thinner, generally of limited external toughness, and a few in the middle of the wood.

The role of leaves

Respiration: The leaves of the plant breathe through the stomata on the leaves, and air can enter and exit from the stomata to diffuse the gas exhaled in the tanshan to all parts of the tree to meet the needs of growth.

Photosynthesis: Plants have chloroplasts in their leaves, and chloroplasts can photosynthesize and fight for oxygen for their own growth.

Nutrient conversion: Plants inhale carbon dioxide from the air through the stomata on the leaves and convert them into nutrients such as starch, allowing the tree to grow more vigorously.

Transpiration: The transpiration of the infusion is a major driving force for the absorption and transport of water by plants. In particular, tall plants, without transpiration, can cause water shortages at the top of large trees, and in severe cases, cause tree death.