Formal Lab pre ap biology

Courtney S.
4th Period

SINKERS and FLOATERS
Purpose:The purpose of this investigation is to provide an overview of photosynthesis and to design and conduct an experiment to test the factors that affect the rate of photosynthesis.
Hypothesis:If 10 leaf discs are placed into 2 plungers and placed under a lamp the CO2 rate will speed up the process of photosynthesis.

Materials:

-Fluorescent lamp
- Hole punch
- 1 Sharpie marker
-20 leaf discs
-Syringes
-12 mL cups

Data Table
Start

2

4

6

8

10

12

14

16

18

20

High
(Bakin
g
Soda)

1

2

4

4

5

6

6

7

9

9

Low
(Water
)

0

0

0

1

2

2

2

3

3

4

Analysis: By increasing the CO2 concentration it will increase the rate of photosynthesis until other factors become limited.
2. The reason a vacuum was created was to draw the air out of the mesophyll tissue in the leaf discs.
3. The baking soda the carbon dioxide for photosynthesis. When the light hits the tube the leaf discs will produce oxygen gas and float to the top.
4. Oxygen accumulates in the air spaces of the spongy mesophyll, and the leaf disk will once again become buoyant and rise in a column of water.
Conclusion: 6CO2+6H2O→C6H12O6+6O2.
2. Water, Light and Temperature are the main environmental factors that will affect photosynthesis, along with availability of CO2
3. If photosynthesis ceased there would be little food or organic matter on
Earth. Most organisms would disappear, and in time Earth’s atmosphere would become nearly devoid of oxygen.
b. ATP is formed by the addition of a phosphate group to a molecule of adenosine diphosphate (ADP).

Courtney S.
4th Period