Plants 2d:Plant Parts

PPt. by, Robin D. Seamon

LEAVES & Photosynthesis

LEAVES:

LEAVES:

Activity

•Leaf Hunt Lab

•Leaf rubbings

•Leaf pressing

•Leaf pounding

PARTS OF A LEAF

•Veins carry water & minerals to the leaf; carry the food the leaf makes away from the leaf

•Blade the main part of the leaf

•Petiole connects the leaf to the branch

Vein

Vein

KINDS OF LEAVES:

•Simple leaves: one leaf blade

•Compound leaves: several symmetrical leaves

•Turn colors in the Fall & fall off-

•deciduous tree leaves will freeze in the winter, so as a precaution, trees take in all of the chlorophyl to store in the trunk & roots until spring

•Leaves without green = color!

•Needles: special kinds of leaves to conserve water

•Make food for the plantADVANCE

Simple Leaves

BACK

BACK

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•Transpiration- process by which plants lose water through the leaves

99% water taken into roots are transpired out the leaves

2. Water through cortex of root to xylem & up stem

1. Water from soil into root hairs

3. Transpiration in leaves helps draw water up stem

4. Water moves up stem to veins to cells

Transpiration film LINK

•Respiration- process by which plants lose air (carbon dioxide) through the leaves

•Guard cells close & open the stomata as needed

•Photosynthesis- process by which plants turn sunlight into energy (food)

http://www.grow-a-head.com/index/index.php?option=com_content&task=view&id=24&Itemid=62

HSW: video Autotrophs vs. Heterotrophs (1 min)

HSW: Photosynthesis Video 2.5 min

80

Hg200.59

Mercury

Atomic number (electron/proton pairs)

Atomic weight

symbol

Element name

Electron (-)nucleus

Proton (+)

Neutron

1. Chlorophyll absorbs light from the sun

2. Sun’s energy splits water molecule into hydrogen & oxygen

3. Hydrogen joins carbon dioxide to make food (sugar/glucose)

4. Sugar carried through the plant; oxygen is released into the air

6 6 6

H2O O2CO2 =+ + C6 H12 O6

PHOTOSYNTHESIS

MOVE

O

OO

C C

C C

C C

O

OO

C C

C C

C C

O O O O O

O O O O O

O O O O O

H HH H H H

H HH H H H

PLANT LABS:1. Leaves: Identify & graph your collection into journal; view & draw fern spores;

Answer questions in Plant Journal.

2. Flowers: identify & draw 5 local spring flowers on white paper. Glue into journal.Roots: identify fibrous & taproots; draw 7 label root parts in journal; Answer questions in Plant Journal.

3. Seeds: seed dissection: label 3 parts of the seed into journal; observe pine nuts in pinecones-- sketch into journal; Answer questions in Plant Journal.

4. Stems: Compare three different types of bark. Notice the color & texture. How do the grains run? Is there a pattern? Create a bark rubbing with a dark crayon (rubbed sideways). Sketch the three specimens.

Header:

LAB: LEAVESRULES: BE GENTLE WITH THE LEAVES. They are fragile!

• What kinds of leaves are in your envelope? ___________, ______________, _______________, _______________, ______________

• Write how many of each kinds of leaves on the lines above.

• Sketch one of the leaves, labeling the blade, veins, midriff, & petiole

• What are the three processes performed by the leaves for the plant. _______________, ______________, _______________

• What is the difference between a simple leaf and a compound leaf? _____________________________________________________________

Header:

Leaf Bank: oak, maple, dogwood, elm, beech, redbud, sweetgum