RPT Photosynthesis & Respiration

RPT Photosynthesis & Respiration

Photosynthesi
s
&
Respiration
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Version 42-0102-00-01

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This document is not meant to be a substitute for a formal
laboratory report. The Lab Report Assistant is simply a
summary of the experiment’s questions, diagrams if needed,
and data tables that should be addressed in a formal lab report.
The intent is to facilitate students’ writing of lab reports by
providing this information in an editable file which can be sent to
an instructor.

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Data Table 1: Photosynthetic Rates
Rate
Distance (mm)
Solution starting measurement
0mm
Net
photosynthesis
1.5mm
Respiratio
n
Gross photosynthesis (net photosynthesis + respiration) 1.5
Rate of photosynthesis (gross photosynthesis / 10 min) 0.15
Bag mass 4.8
g + 1.5 g NaHCO3 = 6.3 Final
mass (g)

Experimental
Conditions
With Elodea
Without Elodea

Data Table 2: Respiration Results

Starting
distance

Final
distance

Change in
movement

Time
(min)

Que  t  ons                                                                                              
   
s i
 
Exercise 1: Photosynthesis Part I
A.

What molecules did the plant produce when exposed to

light?
B.

The plant was exposed to oxygen

C.

What resources were consumed to produce the molecule?

D.
C. What part did light play in the reaction?
The light increased the distance the water moved by using the light the water converted into carbon
dioxide.

D. What molecule was consumed by the plant while it was in the
dark? E. What molecule was produced by the plant while it was
in the dark? F.

Where did the molecules go that were

produced in the dark?
G. What critical service do plants provide humans?

H. Would animal life on Earth be possible without plants?

I. Would any life on Earth be possible without sunlight?

Exercise 2: Photosynthesis Part II
A. When you blew through the straw into the Bromothymol blue solution, what gas did
you add? What color change did you observe in the solution and why?

B. What color change occurred after you placed the plant into the respirometer and
turned on the light?

C.

What was happening when the solution in the horizontal tubing started to

move? D.

How long did it take the color change to occur after the solution

started to move? E. Why did the color change?
F. When you repeated the experiment without a plant in the respirometer, what
happened and why?