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Leaves are composed of epidermis, mesophyll, xylem, and phloem tissues. A waxy cuticle covers the epidermis; the mesophyll is where photosynthesis usually occurs. The xylem conducts water, and the phloem transports sugars. Leaf formation is initiated at the shoot apical meristem.
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The main light-collecting structure on a leaf is a large, broad, flat surface called the leaf blade. The blade is held away from the stem and supported by the petiole. Monocots have leaves with parallel veins. Dicots have leaves with veins that connect and branch from each other.
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Include: Preface, Morphology Of Leaf, Anatomy Of The Leaf, What Makes Leaves Fall, Herbaceous, Leaves, Leaves Of The Shrules, Leaves Of The Trees, Evergreen Leaves, Leaves Of Grasses, Bamboos And Ferns, Leaves Of Wet, Water And Waterside Plants, Seasonal Effect.
The structure of a hydrophytic leaf differs from a mesophytic leaf due to selective pressures in the environment -- water is plentiful, so the plant is more concerned with staying afloat and preventing herbivory. Figure 5.3.2 5.3. 2: Nymphaea, a water lily, has hydrophytic leaves. These contain large air pockets and astrosclereids.
The first part of the book describes and clearly illustrates the major plant structures that can be seen with the naked eye or a hand lens. The second part focuses on how plants grow: bud development, the growth of reproductive organs, leaf arrangement, branching patterns, and the accumulation and loss of structures.
Feb 17, 2023 · Learn the internal structure (anatomy) of a leaf. What are its different layers and their functions. Check out a labeled diagram.
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Whorled Leaf Arrangement; In angiosperm anatomy, a leaf can be identified by where it emerges from the node. In a node, a leaf emerges below the axillary bud. Figure \(\PageIndex{1}\): A diagram of a node. Each node is comprised of a leaf (on the bottom) and an axillary bud (on the top, located in the axil where the petiole meets the stem).
