Transcript Parts of a Plant

Warm-up
Why
are plants important?
Lesson Essential Question
Why
are plants important?
1.Leaves-
produce food used by
plant & stored for later use by plant
or animal
Leaves
Vary
in shape & size
Identify plant
Arrangement differs
Some alternate
Some opposite
Some whorled
Petiole-
leaf stalk
Blade- flat part of the leaf
External Leaf Structure
Veins-
structural
framework
Different margins- assist
in plant ID
Internal Leaf Structure
Specialized
cells that
perform important
functions
Skin of leaf- epidermis
Single layer of cells to
protect leaf from loss of
moisture
Internal Leaf Structure
Guard cells- open &
close pores (stoma) to
allow leaf to breathe &
transpire & exchange
gases
2.
Stems- 2 functions
Movement of materials
Support of leaves and
reproductive structures
External Stem Structure
Lenticels
(breathing
pores) on outside
Bud scale scars
Where a terminal bud
located.
Distance between equals
1 yr of growth
External Stem Structure
Leaf
Scars
Where leaves were
attached
Internal Stem Structure
Water
& mineral travel up
xylem
Manufactured food travels
down phloem
Internal Stem Structure
Dicots-
xylem & phloem
form 2 layers separated by
cambium (produces cells)
Cambium builds new
phloem cells on outside &
new cells inside (grows)
EX: Trees
Internal Stem Structure
Dicot
Sapwood-
new active
xylem
Heartwood- old, inactive
phloem
Internal Stem Structure
Monocots-
vascular bundles
contain xylem & phloem
No cambium
All cells formed at initial
stage of stem growth &
enlarge
Limited in size
3.
roots
anchor the plant and hold
it upright
Absorb water and
minerals from the soil
and conduct them to the
stem
 Roots
Internal Root Structure
Stem
Older
roots of shrubs have
phloem outside, cambium
layer & xylem inside
External Root Structure
Very
different from stem
Roots have root cap- many
hairs behind.
Side roots of increasing
size form as root grows
older
External Root Structure
Root
cap produces a
continuous supply of new
cells that rub off to
lubricate a path & protect
cap through soil
External Root Structure
Root
hairs absorb moisture
& minerals conducted to
the larger roots & stem of
plant
 4.
Flowers
Assignment
10
minutes
Compare & contrast the
difference between
fibrous root systems and
tap root systems.
Assignment
Obtain
a piece of a plant
Observe the 3 parts we
just learned about and
label what you can see.
I will come around and
check
30 minutes.
Warm-up
What
are the 4 main parts
of a plant?
Lesson Essential Question
What
are the parts of the
flower?
Beauty
of flower- attract
insects that pollinate to begin
fruit and seed formation.
Fruit and seeds- collected,
eaten, and spread.
continued existence of the
plant itself.
Sepals-
green leaf-like
parts of the flower that
cover and protect the
flower. Form the calyx
after the flower is open.
Petals-
actually leaves.
Colors attract insects for
pollination.
Stamens-
Male
reproductive part of the
flower.
Filament- short stalk
Anther- saclike
structure, contains
pollen, the male sex cell.
Pistil-
Produces the
female sex cells- the eggs.
If fertilized, these eggs
become seeds.
Pistil
3 partsStigma- sticky top to catch
pollen
Style- tube that leads to the
third part
Ovary- egg that becomes a
fruit or seed coat.

Pistil
Plant Processes
AHS Agriculture
Warm-up
What
are the parts of a
flower?
Lesson Essential Question
How
do the plant
processes work?
Transpiration
Evaporation
of water
through plant leaves &
stems
When water not available,
slows down or stops
Transpiration
Drought-
stomata close &
photosynthesis slows/stops
No water/carbon dioxide
Necessary for plant
survival
Cools plant
Transpiration
Maintains
flow of
nutrients & food from root
to top
Guttation- when soil too
moist, plants force water
from leaf vein tips to
reduce pressure
Photosynthesis
Process
by which carbon
dioxide & water converted
to sugar & oxygen in the
presence of light
Choloroplasts- food
making cells in plant
Photosynthesis
Chlorophyll-
gives green
color
Plants beginning of food
chain
Oxygen used by animals &
all forms of oxidation
Photosynthesis
Food
manufactured in
leaves
Moves toward stem to
roorts
Used or stored in form of
starch, protein or sugar
Photosynthesis
Carbon
dioxide enters
through stoma
Good growing conditions
maximize photosynthesis
Photosynthesis
Respiration
Consume
oxygen & give off
carbon dioxide
Adequate supply of oxygen
needed to all parts of plant
Produce more oxygen in
photosynthesis then usereleased
Video
Review
Study
for test.