Transcript BioD Notes Plant Anatomy Leaf

The Four Basic Parts of Plants
 Leaves
 Stems
 Roots
 Flowers
Leaves

Functions


Make food through photosynthesis
Site of gas exchange

Respiration


Photosynthesis


(CO2 and water vapor released)
(O2 released)
Store food (sugars)
Each species has unique leaf
shape

Adapted for their environment


For light gathering
For retaining water
Parts of the leaf

Blade: Wide/Flat



For light gathering
Collects sunlight
Petiole: Thin stalk

Connects blade to stem
Tissues of the Leaf

Cuticle


Waxy substance that
covers the leaves &
stems
Waterproof layer
that keeps water in
plants
Tissues of the Leaf (Epidermis)

Stomata


Openings in the
underside of leaves
For transpiration and
gas exchange
Tissues of the Leaf (Epidermis)

Guard Cells


Two cells located on
each side of stomata
Open and closes
stomata
Tissues of the Leaf (Epidermis)

Guard Cells

Absorbs water during
the day and swells
up into a semi-circle
shape, opening the
stoma

Water evaporates and
CO2 can enter
Tissues of the Leaf (Epidermis)

Guard Cells

Water is lost

Guard cells deflate,
closing stomata
Tissues of the Leaf

Vascular Bundles



Called veins
Phloem moves food
from leaf to the rest
of the plant
Xylem moves water
& minerals up to
leaves from roots
Number of leaves

Simple:

1 blade connected to
petiole
Number of leaves

Compound:

Many blades
connected to one
petiole