Why are plants important? 1.Leaves- produce food used by plant & stored for later use by plant or animal.

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 differsSome alternateSome oppositeSome 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- epidermisSingle 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 functionsMovement of materials

Support of leaves and reproductive structures

External Stem Structure Lenticels (breathing pores) on outside

Bud scale scarsWhere a terminal bud located.

Distance between equals 1 yr of growth

External Stem Structure Leaf ScarsWhere 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. rootsanchor 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 stalkAnther- 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 ProcessesAHS 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/stopsNo 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 use- released

Video

Review Study for test.