1.5 g1.5 g 1.5 g1.5 g 1.5 g1.5 g

Radish Experiment:•Weigh out 3 batches of radish seeds

each weighing 1.5 g.

1.5 g1.5 g 1.5 g1.5 g 1.5 g1.5 g

1) Light, 1) Light, No WaterNo Water

2) Light, 2) Light, WaterWater

3) No 3) No Light, Light, WaterWater

Radish Seeds

•After 1 week, all plant material was dried in an oven overnight (no water left) and plant biomass was measured in grams.

1.5 g1.5 g 1.5 g1.5 g 1.5 g1.5 g

(1) (1) Light, Light, No No WaterWater

(2) Light, (2) Light, WaterWater

(3) No Light, (3) No Light, WaterWater

Q1. Predict the biomass of the plant Q1. Predict the biomass of the plant biomass each treatment.biomass each treatment.Discuss in groups: write your predictions on Discuss in groups: write your predictions on carbonless (1 per group).carbonless (1 per group).

1.46 g 1.83 g 1.17 g

RESULTS

1.46 g 1.83 g 1.17 g

Q2. In groups, on your carbonless, write an explanation for the results observed in each treatment.

Most important reaction in the world!!

C6H12O6 + O2

PhotosynthesisPhotosynthesisCO2 + H2O

Q4. In a plant, what happens to the glucose?

Respiration Respiration BiosynthesisBiosynthesis

New Organic MoleculesNew Organic Molecules(carbs, fats, lipids, nucleic acids)(carbs, fats, lipids, nucleic acids)

PhotosynthesisPhotosynthesisCO2 + H2O

ATPATP

C6H12O6 + O2

CO2, CO2, H2O H2O

Primary Production

• NPP = Photosynthesis - Respiration • Amount of photosynthate (glucose/food)

available to other organisms • Measured in grams

• “amount of light energy converted to chemical energy” (photosynthesis)

Net Primary Production (NPP)

Q3. How does NPP influence trophic structure?

1.46 g 1.83g 1.17 g

Which treatment illustrates NPP?

Q4. How would you measure NPP?

• a) count plants• b) weigh plants• c) use fancy

equipment• d) all of the above