B Block Phototropism Results
Data
Jenn, Annie, Felicia
Box Design
The plants did not grow at all.
Hypothesized direction
of growth
light
Day
Growth of Plant
1
0 cm
20
0 cm
Analysis
● Since the plant did not grow, no conclusion regarding phototropism was
derived.
Why didn’t the plant grow?
● One of the seeds was split in half and the other was not found.
● They died.
What should have happened?
● Theoretically, the plants should have grown downwards and bent around
the cardboard obstacles towards the light source at the bottom.
A Study on Post Mortem Plant Growth
A Scientific Journey ft. Mikel, Karthik,
and Shyam
Design
Two holes
were cut
on the sides
of the box
allowing
light in
A barrier was
assembled to
insure the plant
grew in a Y
shape. But that
didn’t work.
Data
Day 1 to Day x: 0 cm tall :(
SEM: 0!
Graph:
Growth
(cm)
Time (days)
Conclusion: Our plants are
probably dead
Plant Growth Analysis: A Study on Post Mortem Plant Growth
- Our plant showed no growth despite one of the seeds
germinating.
- This was most likely due to human error, as all of the seeds
were damaged when the CD case was opened. Parts of the seeds
had plastered to the cover of the case.
- If our plant had grown, we predict it would have looked like the
picture to the right
Phototropism Laboratory
By: Alex Cardeiro, Ryan Ditcham, Jonathan
Townsend
The Low Down
● We put a barricade to prevent the sun from
coming in the middle of the shoe box
o
We expected the plants to grow around the
barricade
It worked!
Plant Data
Analysis
● As the plants grew taller, they curved around
the board in the middle of the box
● This happened because of the plant
hormone cytokinin, which allows the plant to
grow laterally
● This is what we expected to happen,
because we thought the plant would curve to
"seek out" the sunlight
Phototropism Lab
Presentation
By: Olivia Gregg, Shannon Molloy, Eric
McCord, Jimmy Ward
What we saw happen was…
Something go wrong with our plant and the shoot detached from the root, therefore we saw no growth
apically or laterally.
That happened because….
We are not one hundred percent sure what happened to our plant. We think the box it was in could have
been hit and the shoot could’ve snapped off. We tried for lateral growth as well, but that did not happen because there
was not enough light to let it grow at all.
What we expected to happen was…
The plant would grow towards the direction of the the light that was reflecting off the mirrors.
Data Summary
We observed growth of only 2 cm after our
plant stem broke early in our experiment,
possibly due to movement in the box or being
cut. We then looked for lateral growth but none
was observed.
Phototropism Lab
Shannon, Aine, Jillian, Nancy
Data Summary
Date
Plant 1 (Jeremy the
Jer-minator) Growth
Plant 2 (Doris)
Growth
3/10/15
2.9 cm
0 cm
3/11/15
decapitated, 3.1 cm
0 cm
3/12/15*
dead/moldy
decomposing; 0
cm
* project was discontinued as both plants showed signs of decay
Analysis
Expected:
If light is blocked from all
sides of the plant excluding
the bottom, then the plant
will grow laterally due to
cytokinins and downward
due to the effects of
phototropism and blocking
of apical stem growth.
Observed:
● plants both died
● unknown cause- no results
Possible Explanation:
● dehydration (though we watered
them every day)
● lack of light→ very little got into the
box
● seed was dead before planted
○ decomposition affected live
sprout
Phototropism
by Thomas Sherriff and Siddhant Navali
Summary
Phototropism and Gravitropism are the growth patterns in
plants in response to certain stimuli such as light and
gravity. Auxin plays a primary role in the directional growth
of plant stems and roots in response to changes in light
and the effects of gravity. In phototropism, Auxin loosens
the cellulose in the cell wall to stretch the plant in the
direction of the light. Gravitropism works in reverse, forcing
the Auxin to the bottom side of the roots to inhibit the
loosening of the cell wall, allowing for the upper cells to
stretch down because of gravity.
Hypothesis
If the seeds are placed standing up in four
orientations, then the roots will grow towards
the pull of gravity and the stems will grow
against the pull of gravity because of Auxin’s
role in directional growth
Baby Picture <3
Pictures
Middle
End
Data
Height (centimeters)
Day 1
Day 2
Day 3
Day 4
Day 5
Day 6
Day 7
Day 8
Day 9
Plant 1
9.5
12.5
18.5
21.5
26
26.5
26.5
Plant 2
8
10
15
17
18
18
18
Plant 3
0
0
0
0
9
9
9
9
9
Plant 4
0
0
0
0
6
6
6.5
6.5
6.5
Plant 5
0
0
0
0
0
0
0
0
4
* this plant folded over because it could not support itself and dried out
26.5
26.5
18 7*
What Happened?
The first two plants grew towards the light very quickly, and
within days reached their maximum potential for growth. They
stunted at 26.5cm and 18 cm respectively. This was expected as
they grew around the cardboard that was blocking sunlight in
order to grow towards the one opening with light.
The other three plants grew a little bit, but they were left in the
dark for too long and so they stopped growing vertically, and it
seemed that all of the plants stopped growing at one point. On
day 6, the sides that the plants were on flip-flopped, so plants 1
and 2 were in the dark while plants 3,4, and 5 were exposed to
light. However, minimal growth occurred.
Why it happened?
Plants 1 and 2 grew quite quickly because the auxin directed them to
grow towards the light. However, once they reached a certain point,
they stopped growing because otherwise they would have become too
tall and would not have been able to support themselves, as evidenced
by what occurred to plant two on the final day.
Plants 3, 4, and 5 grew vertically with little exposure to light when they
were placed on the right side of the box. However, by the time we
switched the sides that the plants were on, their growth had already
stunted and they had stopped producing auxin. Therefore, even when
they were placed underneath the cardboard, closer to the light source,
they did not grow toward the light and simply maintained their growth.
Plant Tropism Lab
Nam Le, Manoj Malipeddu, Thien Vu
Gravitropism Data
Plant
Day 1 (cm)
Day 2 (cm)
Day 3 (cm)
Day 4(cm)
Day 5(cm)
Right Top
6.25
6.25
6.25
8
9.5
Right
Bottom
4.25
6.25
8.25
9
10
Left Top
2.5
2.5
3
8
10.5
Left Bottom
3
6
10.5
13
13
Bottom
Right
1
1
1
1
1
Bottom Left
0
0
0
0
0
Top Right
0
0
0
0
0
Top Left
0
0
0
0
0
Phototropism Data
Plant
Day 6
(cm)
Day 7
(cm)
Day 8
(cm)
Day 9
(cm)
Day
10
(cm)
Day
11
(cm)
Day
12
(cm)
Day
13
(cm)
Day
14
(cm)
Day
15
(cm)
1
19
22
23.5
23.5
28.7
29
25.5
26
26
26
2
14
17
19
21
24
25
28
28
28.5
29
3
15
15
19
24
29.2
29.7
30
27
28.5
29
March 5
March 6
March 11
March 13
March 16
March 23
Analysis
● The plants just kept growing straight up.
Before the piece of cardboard was taken out
on March 11, the plant grew to the
horizontally because the piece of cardboard
was preventing it from growing up. However
once it was removed, the plant began to
grow straight up again like on March 16.
Analysis Continued
● The plant grew horizontally while the piece of cardboard
was there because it could not grow vertically. However
once it was removed it had a lot of space to grow
vertically and so it did.
● We did not think we were going to remove the
cardboard so we thought the plant would grow
horizontally the whole time. But, we did take out the
piece of cardboard and so after we removed it we
expected it to grow vertically once again.