OBSERVATION CHARTS
Here is a record of the observations made throughout
the five-week period:
|
Date |
Description of activity |
|
April 17, 2003 |
- Darkness of plants was noted: Ø
Plants under sunlight were
a dark green colour. Ø
Plants under the
incandescent bulb were yellowish green. Ø
Plants under the
fluorescent tube were, similar to the plants under the incandescent
bulb, yellowish green. |
|
April 22, 2003 |
- Darkness of plants was noted: Ø
Plants under sunlight were
a dark green colour. Ø
Plants under the
incandescent bulb were a very pale green colour. Ø
Plants under the
fluorescent tube were a yellowish green colour. - The appearance of leaves was
noted: Ø
Leaves under sunlight were
very big, and not curled up. Ø
Leaves under the
incandescent bulb were curled up. Ø
Leaves under the
fluorescent tube were very thin. |
|
April 25, 2003 |
- Darkness of plants was noted: Ø
Plants under sunlight were
a dark green colour. Ø
Plants under the
incandescent bulb were a very, very pale green colour. Ø
Plants under the
fluorescent tube were a yellowish green colour. |
The following chart shows the height of each of the 24 plants over time:
|
|
Average
Height of Type 1 (cm) |
Average
Height of Type 2 (cm) |
||||
|
Date |
Type of
Light |
Type of
Light |
||||
|
|
Sunlight |
Incandescent |
Fluorescent |
Sunlight |
Incandescent |
Fluorescent |
|
Apr-12 |
1.5 |
1.5 |
1.5 |
0.5 |
0.5 |
0.5 |
|
Apr-13 |
3.875 |
3.75 |
3.875 |
0.5 |
0.875 |
1 |
|
Apr-14 |
6.375 |
7.125 |
7.5 |
1 |
1.5 |
1.5 |
|
Apr-15 |
8.25 |
10.75 |
11.5 |
1.375 |
2.125 |
2 |
|
Apr-16 |
9.25 |
14.5 |
15.125 |
1.75 |
3 |
2.25 |
|
Apr-17 |
10.625 |
17.625 |
17.75 |
1.875 |
4.125 |
3.375 |
|
Apr-18 |
12 |
20.25 |
20.75 |
2.625 |
4.75 |
4.125 |
|
Apr-19 |
13.5 |
22.5 |
22.625 |
3.5625 |
6.125 |
5.3125 |
|
Apr-20 |
15 |
24.75 |
24.5 |
4.5 |
7.5 |
6.5 |
|
Apr-21 |
15.5 |
27.75 |
26.5 |
5.25 |
8.9375 |
6.625 |
|
Apr-22 |
16 |
30.75 |
28.5 |
6 |
10.375 |
6.75 |
|
Apr-23 |
17.25 |
31.75 |
29.75 |
7 |
13.375 |
10.875 |
|
Apr-24 |
19 |
33.5 |
30.625 |
8.25 |
15.5625 |
12 |
|
Apr-25 |
20.75 |
35.25 |
31.5 |
9.5 |
17.75 |
13.125 |
Stem Growth:
All artificial light sources produce some waste heat; the only difference
is the amount of heat. This
increase in temperature allows for a greater capacity of photosynthetic
activity. This is one of the
factors that made the plants that grew under artificial lights to grow faster
then the plants under natural sunlight. Another
reason that contributes to the increased rate of growth is the light quantity.
As mentioned before, sunlight quantity changes with the seasons.
When the experiment was being conducted, it was winter.
In the winter months, sunlight is the most diffused. This decreased the capacity of photosynthetic activity for
the plants under sunlight.
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Copyright (c) 2004 to Noor Alolabi and Yikang Lin