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Welcome to the Timber Ridge Magnet School/Grove Elementary
School Second Grade Science Fair Collaborative
Below you will find two second grade projects that are being conducted by the two schools named above. The projects will begin on Monday, February 23, 1998.
Look below for a daily journal to keep you updated on the results.
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| What is Stomata? |
| Question: What side of a plant leaf takes in gases? |
| Hypothesis: Ten (10) students say the top of the leaf takes in gases because when rain and watering cans water plants it comes from above and hits the top of the plant leaves first. Ten (10) say the bottom of the leaf takes in gases because after observing the leaves from each plant the bottom of the leaves were more veiny and the skin of the bottom leaves seemed thinner. The top of the plant leaf had a thicker, waxy covering and it looked like water would be hard to get through it. |
| Materials: Two varieties of plants
Vaseline A Camera |
| Procedure: Coat the top of four leaves from each plant with a
heavy layer of Vaseline.
Coat the underside of four leaves from each plant with a heavy layer of Vaseline. Observe the leaves daily for one week. Is there any difference in the two sets of leaves? |
| Results: Three of the four leaves that had Vaseline on the underside, died. Only one leaf with vaseline on the top died. Therefore, we believe that plant leaves take in gases from the bottom, not the top, of each leaf. |
| Why: Openings on the underside of plant leaves called stomata allow gases to move into and out of the leaves. The vaseline plugged the openings and the leaf was not able to receive the necessary carbon dioxide gas or eliminate excess oxygen gas. |
| Day One Image from Timber Ridge Magnet School |
Day One Image from Grove Elementary School
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| Observation Journal Day One
Text Monday, February 23, 1998 Each student closely observed each plant. The students observed no change in both plants by the end of the day. The Vaseline made the leaves heavier and each plants' appearance
changed after the vaseline was applied.
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Observation Journal - Day One
Monday, February 23, 1998 The students did not notice much change in the leaves with Vaseline on the tops or the bottoms. The class felt that the leaves with Vaseline were shiny and the plain leaves were dull. They also discussed that the leaves that were treated were darker in color. We needed to discuss that the leaves were originally light on the under side and darker on the top because they felt this was a change caused by the Vaseline. |
| Day Two Image from
Timber Ridge Magnet School Wednesday, February 25, 1998 |
Day Two Image from
Grove Elementary School Wednesday, February 25, 1998 |
| Observation Journal
Day Two Text- Wednesday, February 25, 1998. Today we have seen no change in both plants A and B. In the picture above you can see one leaf from each plant, which was clipped on Monday prior to forming the hypothesis so each student could feel and closely observe a leaf from each plant. |
Observation Journal
Day Two Text Wednesday, February 25, 1998. Wednesday the children truly observed nothing different from Monday to Wednesday. |
| Day Three Image from
Timber Ridge Magnet School |
Day Three Image from
Grove Elementary School |
| Observation Journal
Day Three Text Friday, February 27, 1998. Plants A and B both appear to show little change. Both plants are still green and healthy looking. The leaves with vaseline appear to droop more than the others but that is the only noticeable change. Final Observation: March 3, 1998
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Observation Journal
Day Three Text- Friday, February 27, 1998. Friday: The students observed that the leaves with the Vaseline on the underside not only started to yellow, but they showed dry brown spots on top. Obviously the leaves were not going to live. |
Questions about this page? Email: portnerf@d65.k12.il.us
or: olssen.k@webruler.northbrook27.k12.il.us
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