Transcript Photosynthesis Data B Block

Photosynthesis Rate Results
Ms. Albu
B Block
Photosynthesis Lab Findings
● We tested the photosynthetic
rate of leaf discs of spinach
(control) to arugula
(experimental) under a 100
watt lamp
● Spinach had a higher rate of
photosynthesis
● We observed spinach to be
more green in color than the
arugula
● Our graph:
Time
(Seconds)
Spinach
Discs
Floated
(Control)
Green
Mustard
Discs
Floated
0
(Experiment
al)
60
1
6
70
-
10
120
5
-
180
6
-
240
7
-
300
9
-
313
10
-
0
0
Manoj Malipeddu, Nam Le, Thien
Vu
Average Rate (Green Mustard
Leaves) = 10 discs / 70 seconds =
.14 discs / second
Average Rate (Spinach Leaves) = 10
discs / 313 seconds = .032 discs /
second
Alex Cardeiro, Jonathan Townsend,
Ryan Ditcham
Rate of Photosynthesis over Time for Spinach Leaves and
Crabapple Leaves by Shyam, Karthik, and Michael
● Spinach Leaves
photosynthesized at a
faster rate than that of the
Sweet Crabapple Leaves
(0.9 leaves/min vs. 0.8
leaves/min)
● Since the Spinach leaves
were darker than the
Sweet Crabapple leaves, it
photosynthesized faster;
the darker leaves allowed
it to absorb the light more
efficiently
Rate of Photosynthesis in Mint and
Spinach Leaves
Photosynthetic rates:
Spinach: 16/228 seconds = 0.0702 floats/sec
Mint: 16/320 seconds= 0.05 floats/sec
Shannon Forty, Aine Holland, Jillian Nelson, and Nancy Wang
possible sources of error:
★ 4 mint leaves already at surface before start of
experiment
★ only did one trial
Our hypothesis was incorrect, because the spinach leaves had a
higher rate of photosynthesis. While all 16 spinach leaf chads
photosynthesized in 3 minutes 48 seconds (or 228 seconds), it
took about 5 minutes and 20 seconds (or 320 seconds) for 16
mint leaf chads to photosynthesize. According to our research,
darker green leaves appear darker because they absorb more
light. By absorbing more light, the leaf would be able to
photosynthesize at a higher rate than a leaf with less light
absorption. Thus, the darker spinach leaves photosynthesized at
a higher rate than the lighter mint leaves because of the
difference in leaf color.
Hypothesis: If rate of photosynthesis in mint and spinach leaves
was tested, then both plants would have relatively similar
respiration rates because their growing conditions are similar.
Rate of Photosynthesis in Spinach and Kale
Summary
The rate of photosynthesis in kale was faster than that of
spinach. Kale has a relatively thicker leaf which means
that it has more intercellular space that can be filled with
more mesophyll cells and more layers of photosynthetic
cells. This allows for more air exchange and
subsequently photosynthesis occurs more frequently
during a certain period of time, making for an overall
faster rate of photosynthesis.