5 Questions
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
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
Lamina
Apex may be: ______ Rounded - arch-like Emarginate - notched Caudate - tail-like Flattened
Pointed
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
Grass
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
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.
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