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Leaves Generally expanded and flattened green structure growing out at the nodes of the stem.- Main organ for ______
Leaves Generally expanded and flattened green structure growing out at the nodes of the stem.- Main organ for ______
photosynthesis
Parts of Dicot Leaf a. ______ or Leaf Stalk - Cylindrical or flattened structure which supports and holds the leaf upright - Conducts materials to and from the leaves - May have two small, leaf-like outgrowths at its base called the stipules - Leaves without petiole are called sessile leaves
Parts of Dicot Leaf a. ______ or Leaf Stalk - Cylindrical or flattened structure which supports and holds the leaf upright - Conducts materials to and from the leaves - May have two small, leaf-like outgrowths at its base called the stipules - Leaves without petiole are called sessile leaves
Petiole
b. ______ or Leaf Blade - Thin, flattened, usually green expanded part of the leaf - Variable external features are its overall shape, apex, margin and base Shape may be: Linear- long and slender; Ex: Grass, Talahib Cordate - heart-shaped; Ex: Anthurium, Gabi Ovate - egg-shape; Ex: Eucalyptus, Rose Deltoid - triangular; Ex: Cotton Wood, Louisiana Reniform - kidney-shaped; Ex: Pink pyrola Orbicular - disk-like; Ex: Kastuli Flabellate - fan-like; Ex: Ginkgo biloba Cuneate - wedge-like Apex may be: Pointed Rounded - arch-like Emarginate - notched Caudate - tail-like Flattened
b. ______ or Leaf Blade - Thin, flattened, usually green expanded part of the leaf - Variable external features are its overall shape, apex, margin and base Shape may be: Linear- long and slender; Ex: Grass, Talahib Cordate - heart-shaped; Ex: Anthurium, Gabi Ovate - egg-shape; Ex: Eucalyptus, Rose Deltoid - triangular; Ex: Cotton Wood, Louisiana Reniform - kidney-shaped; Ex: Pink pyrola Orbicular - disk-like; Ex: Kastuli Flabellate - fan-like; Ex: Ginkgo biloba Cuneate - wedge-like Apex may be: Pointed Rounded - arch-like Emarginate - notched Caudate - tail-like Flattened
Lamina
Apex may be: ______ Rounded - arch-like Emarginate - notched Caudate - tail-like Flattened
Apex may be: ______ Rounded - arch-like Emarginate - notched Caudate - tail-like Flattened
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Shape may be: Linear- long and slender; Ex: ______, Talahib Cordate - heart-shaped; Ex: Anthurium, Gabi Ovate - egg-shape; Ex: Eucalyptus, Rose Deltoid - triangular; Ex: Cotton Wood, Louisiana Reniform - kidney-shaped; Ex: Pink pyrola Orbicular - disk-like; Ex: Kastuli Flabellate - fan-like; Ex: Ginkgo biloba Cuneate - wedge-like
Shape may be: Linear- long and slender; Ex: ______, Talahib Cordate - heart-shaped; Ex: Anthurium, Gabi Ovate - egg-shape; Ex: Eucalyptus, Rose Deltoid - triangular; Ex: Cotton Wood, Louisiana Reniform - kidney-shaped; Ex: Pink pyrola Orbicular - disk-like; Ex: Kastuli Flabellate - fan-like; Ex: Ginkgo biloba Cuneate - wedge-like
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Study Notes
Leaf Structure
- Leaves are generally expanded and flattened green structures growing out at the nodes of the stem and are the main organ for photosynthesis.
- Leaves consist of two main parts: the petiole (leaf stalk) and the lamina (leaf blade).
Petiole (Leaf Stalk)
- A cylindrical or flattened structure that supports and holds the leaf upright.
- Conducts materials to and from the leaves.
- May have two small, leaf-like outgrowths at its base called stipules.
- Leaves without petiole are called sessile leaves.
Lamina (Leaf Blade)
- Thin, flattened, usually green expanded part of the leaf.
- Variable external features include:
- Shape: linear, cordate, ovate, deltoid, reniform, orbicular, flabellate, or cuneate.
- Apex: pointed, rounded, emarginate, caudate, or flattened.
- Margin: varies depending on the type of leaf.
- Base: varies depending on the type of leaf.
Examples of Leaf Shapes
- Linear: Grass, Talahib
- Cordate: Anthurium, Gabi
- Ovate: Eucalyptus, Rose
- Deltoid: Cotton Wood, Louisiana
- Reniform: Pink pyrola
- Orbicular: Kastuli
- Flabellate: Ginkgo biloba
- Cuneate: varies depending on the type of leaf
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Description
Test your knowledge on the structure and functions of leaves in this quiz! Learn about the main organ for photosynthesis and the different parts of a dicot leaf, including the petiole or leaf stalk. Explore the importance of petioles and discover interesting facts about leaf anatomy.
