Friday, December 2, 2011

Take out Test Corrections- place on desk No Homework! Use “Nutrients for Plants” to complete

the yellow chart. Do NOT glue or tape it in!

Plants are made of….

Can plants get these things from WATER?

Can plants get these things from SOIL?

Can plants get these things from AIR?

CARBON

OXYGEN

HYDROGEN

MaterialWhat kinds of atoms are in this material?

What kinds of molecules or ions are in this material?

Do these molecules have stored chemical energy (in C-C or C-H bonds?

Air

Plants

Soil

N, O, Argon, C, H

NO

CO2, H2O, O2, N2

NO

Plants are made of….

Can plants get these things from WATER?

Can plants get these things from SOIL?

Can plants get these things from AIR?

CARBON

OXYGEN

HYDROGEN

MaterialWhat kinds of atoms are in this material?

What kinds of molecules or ions are in this material?

Do these molecules have stored chemical energy (in C-C or C-H bonds?

Air

Plants

Soil

NO NO

YES

YES

YES

YES

YES

YESNO

N, O, Argon, C, HC, O, H

N, O, IronPhosphorus, Potassium,

CO2, H2O, O2, N2

Fats, Carbs, Protein, SodiumNitrate, Iron, Phosphate, Potassium

YES

NO

NO

1.Water and “plant food” (or fertilizer) are two things that plants need in order to grow well. Based on your analysis, does either of these things fulfill the scientific definition of food? What is your evidence?

NEITHER ARE FOOD BECAUSE THEY DON’T CONTAIN CARBS, FATS OR PROTEINS (No building blocks or chemical energy)

2. Compare the contents of plant food to those of human food and the multi-vitamin with minerals. Do products labeled “plant food” seem to be more like human food or more like a mineral supplement? What is your evidence?

PLANT FOOD IS MORE LIKE A MINERAL SUPPLEMENT- IT HAS LOTS OF MINERALS—AND NO CARBS, FATS OR PROTEINS

3. Compare the typical composition of soil to that of human food and the multi-vitamin with minerals. Does soil seem to be more like human food or more like a mineral supplement? What is your evidence? SOIL IS MORE LIKE A MINERAL SUPPLEMENT- IT HAS LOTS OF MINERALS—AND NO CARBS, FATS OR PROTEINS

4. Based on what you learned in Food for Animals, and your comparison here, what is the most likely function of soil and plant fertilizers in plant growth?

SOIL AND FERTILIZER PROVIDE MINERALS – to optimize cell processes–BUT NOT FOOD—NO CARBS, FATS, OR PROTEINS

5. Look at the molecule models on the NUTRIENTS IN PLANTS side of the handout. What are PEAS (a plant) made of mostly? What atoms would be needed to build a molecule like this?

PEAS ARE MADE OF MOSTLY CARBS. YOU NEED CARBON (C), HYDROGEN (H), AND OXYGEN (O) TO BUILD CARBS

6. Look at the molecules at the top of the page. What would be a likely source of the molecules needed to make a carbohydrate?

AIR (CO2) AND WATER (H2O) COULD PROVIDE:C, H, AND O ATOMS

7. How do these molecule models serve as evidence that soil isn’t food for plants?

THE SOIL DOESN’T HAVE ANYTHING THAT CAN BE USED TO BUILD A CARBOHYDRATE

CLAIM: SOIL IS NOT FOOD EVIDENCE: 1) VAN HELMONT EXPERIMENT2) LABELS FROM “WHAT DOES

SOIL PROVIDE?”3) PLANT EXPERIMENT DATA

Class Avg.

1 2 3 4 5 6 7 8 9 10 Avg (g)

Change in Soil Mass (g)

-.9 -1.2 -.65 -1.1 -.81 -.47 -1.3 -.45 -.67 -.32 -.79

Change in Plant Mass (g)

2.1 3.3 1.9 2.4 2.9 4.3 3.6 2.7 3.1 2.6 +2.9

• Regardless of experiment, we measured the mass of the soil and the mass of the seeds before we planted

• We also measured the mass of the soil and the mass of the plants after the experiment was done

• The data table represents “good” data from 10 classes’ cups that received water and light—and then an average of all the classes together

• HOW DOES THE DATA SERVE AS ADDITIONAL EVIDENCE THAT SOIL ISN’T FOOD FOR PLANTS?

• WHAT COULD ACCOUNT FOR THIS LOSS? (WHERE DID THE MISSING SOIL GO)

-THE PLANTS GAINED MORE MASS THAN THE SOIL LOST-ALL CLASSES SAW THE SOIL LOST A BIT OF MASS.

SPILLED, DISSOLVED MINERALS, OUT THE BOTTOM WHEN WATERED

THE PLANTS GAINED MASS—MORE THAN THE SOIL LOST. WHERE DO YOU THINK THE MASS CAME FROM?

C,H,O, ATOMS FROM AIR AND WATER

• Make a new entry:WHAT DO PLANTS NEED TO MAKE STARCH?-12/2• Glue in the table

CHECK UP!

Answer the following on the back:MAKE SURE YOUR NAME IS ON THE PAPER AND DO YOUR OWN WORK—NO HELP FROM YOUR NEIGHBOR!

1) WHO HAS THE BEST IDEA ABOUT HOW PLANTS USE SOIL AND WHY