The parts of a leaf include:
Leaf blade: Also called the lamina, this is the flat, green part of the leaf. It's the main site of photosynthesis.
Midrib: The main vein that runs along the center of the leaf. It contains xylem and phloem transport vessels.
Veins: These carry water and nutrients throughout the leaf. They branch out from the midrib.
Petiole: The stalk that joins the leaf to the stem.
Stipules: Small, leaf-like appendages that are usually found in pairs at the base of the petiole. They are protective in some plants.
Apex: The tip of the leaf. Margin: The edge of the leaf.
Base: The bottom of the leaf.
Margin: The edge of the leaf.
Base: The bottom of the leaf.
Leaf Anatomy-
Waxy Cuticle:
Hydrophobic waxy layer that minimizes water loss via transpiration
Upper Epidermis:
Tightly packed translucent cells to minimize water loss via transpiration
Palisade Mesophyll:
Tightly packed column shaped cells, which are the main site of photosynthesis. They contain many chloroplasts:.
Spongy Mesophyll:
Loosely packed irregular cells containing a few
chloroplasts. The air space in between allows for
gas exchange.
Vascular Bundle:
Set of tissues that transport products around the
plant
Xylem:
Upward flowina tubes that transport water from theroots to the leaves
Phloem:
Up and down flowing tubes that transport glucose and other products of photosynthesis from the leaves to the rest of the plant.
Bundle sheath cells:
Tightly packed cells surrounding the vascular
bundle, which can play a key role in photosynthesis in hot dry environments
Stomata:
These openings allow gas exchange in and out
of the leaf. The guard cells open and close in
response to the environment.
Trichomes:
Tiny hair-like protrusions on leaf surfaces
These can deter insects, and some contain
strong-smelling compounds known as
terpenes. Some common terpenes includethose found in citrus fruits, pine, lavender and
tetrahydrocannabinol (THC).
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