Radish Experiment:

1
Radish Experiment

• Weigh out 3 batches of radish seeds each weighing
  1.5 g.

1.5 g
1.5 g
1.5 g
2
Radish Seeds
1.5 g
1.5 g
1.5 g
3) No Light, Water
2) Light, Water
1) Light, No Water
3

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

4
Q1. Predict the biomass of the plant biomass each
treatment. Discuss in groups write your
predictions on carbonless (1 per group).
1.5 g
1.5 g
1.5 g
(1) Light, No Water
(2) Light, Water
(3) No Light, Water
5
RESULTS

• 1.46 g 1.83 g 1.17 g

6
Q2. In groups, on your carbonless, write an
explanation for the results observed in each
treatment.

• 1.46 g 1.83 g 1.17 g

7
Most important reaction in the world!!
8
Photosynthesis
CO2 H2O

• C6H12O6 O2

Q4. In a plant, what happens to the glucose?
9
(No Transcript)
10
Photosynthesis
CO2 H2O

• C6H12O6 O2

Respiration
Biosynthesis New Organic Molecules(carbs,
fats, lipids, nucleic acids)
ATP
CO2, H2O
11
Primary Production

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

Net Primary Production (NPP)

• NPP Photosynthesis - Respiration
• Amount of photosynthate (glucose/food) available
  to other organisms
• Measured in grams

12
Q3. How does NPP influence trophic structure?
13
Which treatment illustrates NPP?

• 1.46 g 1.83g 1.17 g

14
Q4. How would you measure NPP?

• a) count plants
• b) weigh plants
• c) use fancy equipment
• d) all of the above