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PART A. Setting Up the Experiment

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2) Where do plant get the CO for this process (what organisms release this gas)?

1) Did your data support your hypothesis? Explain.

3) What organelle in plants is responsible for photosynthesis (producing food)?

Another complicating factor is that plants absorbmineral nutrient cations and anions and can either raise or lower solution pHdepending on the dissolved ions present.

The behavior of dissolved carbon dioxide is complex because dissolved carbondioxide reacts with water to form carbonic acid (H2CO3), which then can convertto bicarbonate ion (HCO3-) or carbonate ion (CO3-2) as the pH changes.

2) What went well with the experiment?

Cell Biology
1. a. Students know cells are enclosed within semipermeable membranes that regulate their interaction with their surroundings.

4) What is the pigment found in this organelle that absorbs light to power photosynthesis?

1. Place a source of light about 5 cm from the plant.
2. Wait one minute
3. After one minute, count and record the number of oxygen bubbles rising
from the cut end of the stem for 3 minutes. If bubbles fail to
appear after 2 minutes repeat part A.
4. Run a second 3 minute trial at 10 cm from the light sources (sun, room,
overhead lamp, lamp, grow light). Record your results.
5. Run a third trial 3 minute trial with at a 15 cm distance from a light and
record your results.
6. Prepare a graph of your results. The X-axis will be distance from light (IV) and the Y-axis will be number of bubbles (DV) in 3 minutes.

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3) What went wrong with the experiment?

⚠ Version 1 of The Plant List has been superseded.

The amount ofdissolved carbon dioxide in a small beaker will quickly run out when Elodea israpidly photosynthesizing so the sodium bicarbonate provides an abundant supply.

5) What did you learn from this experiment?

includes a further 6 scientific plant names of infraspecific rank for the genus . We do not intend to be complete for names of infraspecific rank. These are primarily included because names of species rank are synonyms of accepted infraspecific names.

The genus is in the family in the major group .

1. Obtain a green sprig of Elodea. Remove several leaves from around the cut end
of the stem. Slice off a portion of the stem at an angle and lightly
crush the cut end of the stem.
2. Place a small pinch of sodium bicarbonate into a test tube (this increases carbon
dioxide in the water).
3. Place the plant into the test tube, stem end up.
4. Filled the test with distilled water so that the stem is completely submersed.

Early Plasmolysis Late Plasmolysis

Cell Biology
1. a. Students know cells function similarly in all living organisms.
1. b. Students know the characteristics that distinguish plant cells from animal cells, including chloroplasts and cell walls.

The volume of the gas canthen be measured.

Robert H. Mohlenbrock. USDA NRCS. 1995. . Northeast National Technical Center, Chester. Provided by USDA NRCS Wetland Science Institute (WSI). .

Observation of a leaf of the water plant Elodea

Standardize your methods including the distance of the container with theElodea from the light source, the Elodea fresh weight per beaker, the watervolume per beaker, the type of water, the amount of sodium bicarbonate perbeaker and the water temperature.

General recommendations for an experiment are as follows: 1.

Problem: To what extent does distance from a light source (5cm, 10cm, & 15cm) affect the rate of photosynthesis (measured in bubbles / 3 min.) in Elodea water plants?

Use replication and statistics, e.g.

Robert H. Mohlenbrock. USDA NRCS. 1995. . Northeast National Technical Center, Chester. Provided by USDA NRCS Wetland Science Institute (WSI). .

under normal conditions with a microscope.

The technique of "wicking" is used to draw a solution across the specimen on a slide. By placing a piece of tissue or paper towel at one edge (right) and dropping the solution at the edge of the other side (left), the solution is drawn or "wicked" across the specimen.

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