Photosynthesis Rate ResultsMs. AlbuB 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:

0 0 0

60 1 6

70 - 10

120 5 -

180 6 -

240 7 -

300 9 -

313 10 -

Average Rate (Green Mustard Leaves) = 10 discs / 70 seconds = .14 discs / second

Average Rate (Spinach Leaves) = 10 discs / 313 seconds = .032 discs / second

Time(Seconds)

Spinach Discs

Floated(Control)

Green Mustard

Discs Floated

(Experimental)

Manoj Malipeddu, Nam Le, Thien Vu

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

Shannon Forty, Aine Holland, Jillian Nelson, and Nancy Wang

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.

possible sources of error:★ 4 mint leaves already at surface before start of

experiment★ only did one trial

Photosynthetic rates:Spinach: 16/228 seconds = 0.0702 floats/secMint: 16/320 seconds= 0.05 floats/sec

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.