Leaf | Definition, Parts, & Function | Britannica
Leaf, any usually flattened green outgrowth from the stem of a vascular plant. Leaves are the primary sites of photosynthesis and manufacture food for plants. They are an integral part of the stem system and can be modified into a variety of other plant organs.
Leaf Anatomy (Structure): Layers and Functions - Science Facts
2023年2月17日 · Learn the internal structure (anatomy) of a leaf. What are its different layers and their functions. Check out a labeled diagram.
30.10: Leaves - Leaf Structure, Function, and Adaptation
2023年10月31日 · Leaf Structure and Function. The outermost layer of the leaf is the epidermis. It consists of the upper and lower epidermis, which are present on either side of the leaf. Botanists call the upper side the adaxial surface (or adaxis) and the lower side the abaxial surface (or abaxis). The epidermis aids in the regulation of gas exchange.
5.3: The Leaf - Biology LibreTexts
2024年5月18日 · Anatomy of the Leaf. Anatomically, leaves consist of epidermis with stomata, mesophyll (kind of parenchyma) and vascular bundles, or veins (Figure \(\PageIndex{12}\)). The mesophyll, in turn, has palisade and spongy variants.
Science of Leaves: Anatomy, Arrangement, & Adaptations
2023年7月12日 · Leaves grow from the stem of a plant and are typically green in color, and this is due to a chemical known as chlorophyll. Leaves serve a multitude of vital functions for plants, including the absorption of nutrients and water, as well as facilitating the process of respiration.
Plant Leaves and Leaf Anatomy - ThoughtCo
2024年10月2日 · The basic components of leaves in flowering plants (angiosperms) include the blade, the petiole, and the stipules. There are three main tissues found in leaves: the epidermis, the mesophyll, as well as vascular tissue. Each tissue type is composed of layers of cells.
13.1: Leaf Parts and Arrangement - Biology LibreTexts
Leaves are generally composed of a few main parts: the blade and the petiole. Figure 13.1.2 13.1. 2: A leaf is usually composed of a blade and a petiole. The blade is most frequently the flat, photosynthetic part. The petiole is a stem that attaches the …
Leaves - Biology Online Tutorial
Leaves are the major photosynthetic organ of a plant. Apart from that, they are also crucial to water movement. In this tutorial, various plant processes are considered in more detail. It also includes topics on leaf arrangements, leaf types, leaf structure, leaf color, abscission, and importance to humans.
Leaf - Definition, Function and Types | Biology Dictionary
2017年8月19日 · The term leaf refers to the organ that forms the main lateral appendage on the stem of vascular plants. In general, leaves are thin, flat organs responsible for the photosynthesis of the plant.
Leaf - Wikipedia
A leaf (pl.: leaves) is a principal appendage of the stem of a vascular plant, [1] usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", [2][3] while the leaves, stem, flower, and …