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Why do leaves look green in the summer and gold-yellow during fall? 2.2. Basic anatomy of the leaf Leaves have evolved from stem to become a flattened organ with a large and flat blade adequate to capture rays of sunlight for photosynthesis. Full-grown leaves share a basic anatomy, depicted below for ivy, Hedera helix. Most leaves show a ...
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The blades of some leaves are broken into three or more sections. A leaf that has only one blade on its petiole is called a simple leaf. Most plants have sim-ple leaves. A leaf that has multiple blades, or leaflets, is called a compound leaf. There are differ-ent kinds of compound leaves. Two common types are the palmately compound leaf and the
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1. Use the microscope to look at a prepared leaf cross-section. In the space provided below, draw a picture of a narrow section of leaf and label all of the following parts: cuticle epidermis guard cells palisade mesophyll spongy mesophyll stomata 2. If the leaf were a greenhouse, what object or area of the greenhouse would do the job of each
cellular level. Plant anatomy is divided into structural categories such as root anatomy, stem anatomy, wood anatomy, leaf anatomy, fruit/seed anatomy and flower anatomy. The study of the external structure and physical form of plants is known as plant morphology. It is useful in the visual identification of plants.
- Overview
- Leaf Anatomy
- Blade Parts
- Petioles & Sessile Leaves
- Stipules
- Compound Leaves
- Leaf Arrangement
This article describes the anatomy of a leaf in angiosperms, including its parts (blade and petiole), variations, stipules, compound leaves, and arrangement. The article includes diagrams and photos to help illustrate the concepts discussed.
A leaf can be identified by where it emerges from the node, and is generally composed of a blade and petiole. The blade is usually flat and photosynthetic, while the petiole attaches the blade to the main stem of the plant. Some leaves are sessile (lacking a petiole). Some plants have paired appendages called stipules at the base of their leaves. C...
In eudicots, leaf blades have netted venation with a central midvein and smaller veins branching off from there; in monocots, veins run parallel to each other without any true midvein.
Most leaves have a stem that attaches its blade to rest of plant called petiole but some do not have one so they are directly attached to plant stem which are known as sessile leaves.
Some plants will have paired appendages found at base of leaf which are called stipules that can look like leaf or take on different forms such as spines or tendrils .
A compound leaf looks like branch with leaflets emerging from it but these leaflets don't emerge from node unlike axillary buds; compound leave may be palmate or pinnate based on how leaflets attach to rachis/petiole tip .
Angiosperms determine arrangement by counting number of leaves per node- alternate has 1 per node , opposite has 2 per node , whorled has 3+ per node encircling stem .
2. Leaves are the most homoplastic organ of a plant, so variations in leaf anatomy relate to leaf shape (centric vs. flat leaves), pattern of venation, complexity of epidermis, number of palisade layers, compactness of ground tissue, presence of crystals, glands, environments, etc. LABORATORY.
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May 18, 2024 · A leaf is lateral photosynthetic organ of shoot with restricted growth. Its functions are photosynthesis, respiration, transpiration, and synthesis. Figure 5.3.1 5.3. 1 Systems of organs and organs of bipolar plant. Figure 5.3.2 5.3. 2 How to distinguish compound leaves (left) from branches (right).
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