Notes for B3.1.8 Distribution of tissues in a leaf - IB | RevisionDojo
B3.1.8 Distribution of tissues in a leaf Notes
Drawing a Plan Diagram of a Dicotyledonous Leaf
A plan diagram is a simplified representation of a leaf’s transverse section, focusing on the arrangement of tissues rather than individual cells.
To create a plan diagram:
Outline the Leaf: Draw a rectangle to represent the transverse section.
Label the Layers: Divide the rectangle into sections for the upper epidermis, palisade mesophyll, spongy mesophyll, vascular bundles, and lower epidermis.
Add Key Features:
Represent the waxy cuticle as a thin line at the top.
Draw stomata as small ovals or circles in the lower epidermis.
Place vascular bundles within the spongy mesophyll, labeling the xylem and phloem.
Tip
Use a ruler for straight lines and label each layer clearly. Remember, plan diagrams emphasize tissue distribution, not cellular details.
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Note
Introduction to Dicotyledonous Leaves
Dicotyledonous leaves are found in plants that have two seed leaves or cotyledons. These leaves have a characteristic net-like venation pattern.
The internal structure of these leaves is organized into distinct layers, each performing specific functions essential for the plant's survival.
AnalogyThink of a dicotyledonous leaf as a multi-layered sandwich, where each layer has a unique ingredient that contributes to the overall flavor and function of the sandwich.
DefinitionDicotyledonous Leaf: A type of leaf found in plants with two seed leaves, characterized by net-like veins and distinct internal layers.
