Photosynthesis &Respiration

Photosynthesis &Respiration
LabRepoRtassistant
obseRvations

Data Table 1: PhotosyntheticRates
Rate Distance(mm)
Solutionstartingmeasurement
Net photosynthesis
Respiration
Gross photosynthesis (net photosynthesis + respiration)
Rate of photosynthesis (gross photosynthesis / 10 min)
Bag mass g + 1.5 g NaHCO3 = Final mass (g)
Data Table 2: Respiration Results
Experimental
Conditions Startingdistance
(mm) Final distance
(mm) Change in movement
(mm) Time
(min)
WithElodea
WithoutElodea
Questions
Exercise 1:PhotosynthesisPartI

A. What molecules did the plant produce when exposed to light? B. What resources were consumed to produce the molecule?
C. What part did light play in the reaction?

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 criticalservice 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:PhotosynthesisPartII

A. WhenyoublewthroughthestrawintotheBromothymolbluesolution,whatgasdidyouadd? What color change did you observe in the solutionand why?

B. Whatcolorchangeoccurredafteryouplacedtheplantintotherespirometerandturnedon the light?

C. What was happening when the solutionin the horizontal tubing started to move? D. How long did it take the color change to occur afterthe solutionstarted to move? E. Why did the color change?
F. Whenyourepeatedtheexperimentwithoutaplantintherespirometer,whathappenedand why?

G. Write one paragraph about Photosynthesis.

H. Write one paragraph about respiration.
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