Question

explain how oxygenis produce by photosynthesis using an experiment

Answer 1

Answer:

Hey mate here is your answer......

.......

Obtain a 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 the plant into the test tube, stem end up, filled with water.

3. Secure the test tube to a metal stand with tape or place the test tube in a

test tube rack.

PART B. Running the Experiment

hope it's helpful for you

thanks

Answer 2

Answer:

Oxygen is produced

Explanation:

Things u need

• 8 sprigs of an elodea plant, an aquatic plant available at your local pet or garden store
• 2 large, clear containers8 sprigs of an elodea plant, an aquatic plant available at your local pet or garden store
• 2 large, clear containers
• Sodium bicarbonate (baking soda), no more than 1 tablespoon2 large funnels (must be small enough to fit inside the large container)
• 2 test tubes (must fit over the end of the funnel)
• A light source: sunlight or at least a 40-watt bulb
• Dechlorinated tap water (chlorine in the water will kill the plant), enough to fill both containers about ¾ full
• Gloves.

Expierement

1.For each sprig remove several leaves at the base of the stem and cut the end at an angle. Gently crush the end of the stem with your fingers. You will use four sprigs for each experimental setup

2.Fill the large container about ¾ full of room temperature dechlorinated water and add a few spoonfuls of the baking soda. Stir the solution until it is fully dissolved. This bicarbonate solution will provide the elodea with the carbon dioxide it needs to use photosynthesis.

Add the same amount of baking soda and water to both of the large containers

3. Add four sprigs to the bottom of each container. Invert the funnel and place in the container so that it covers all of the sprigs of elodea and the end of the funnel points towards the top.

Make sure there is enough water so that the end of the funnel is still submerged. Add more room temperature water, if necessary

Make sure there is enough water so that the end of the funnel is still submerged. Add more room temperature water, if necessary.

4. Either submerge the test tube in water until there are no bubbles left in the tube or simply fill the tube all the way to the top. It is crucial to the experiment that there is no air trapped anywhere in the test tube

5.For the jar in direct light, place it near a window or next to a lamp. For the jar in darkness, store it in a dark room or closet with no windows. Leave a note on the door that says “Do Not Open” so your family will know an experiment is in progress.

The jar stored in the darkness is the “control” for photosynthesis. Since we are trying to prove that photosynthesis produces the oxygen, we want to make sure that no oxygen is produced in the absence of light.

Leave both jars alone for at least 8, but up to 24 hrs.

After just a few hours, you should start to see air bubbles appear in the test tube of the elodea in the light.

After 24 hours

6.Take the jar that has been sitting in the sun at the end of the day. You should see an air bubble at the top of the test tube. For the experiment that was in darkness, there should be no air bubbles at the top of the test tube.

If you don’t see air in the setup that was stored in light, try the experiment again with some fresher elodea sprigs.

If you see air in the setup that was stored in darkness, you may have accidentally let in air while you were setting up the experiment. Try it again, making sure there is no air when you place it in the dark.

7.Put gloves on to avoid contaminating your test tube. Keeping the test tube upside down and submerged in the water, remove it from the funnel. Place your thumb over the end of the tube and take it completely out of the water.

Be careful not to tilt the tube at all because the oxygen bubble at the top will escape and you will have to start the experiment again.

8. Light a match, but blow out the flame quickly so it is still glowing. You might need a second pair of hands for this step: someone to light the match and someone to hold the test tube. Invert the tube so it is now upright and the trapped gas is at the top of the tube. Remove your finger and place the glowing match into the gas of the test tube.

Parental supervision is recommended when lighting matches.

Don’t let the match touch the water, only the gas.

You should see the match reignite, bursting into flame. Because oxygen is highly flammable, when the smoldering match comes into contact with it, it bursts back into flame.

9.Again, remove the test tube from the funnel and place your thumb over the top. Although you can’t see any air at this point, you want to perform all the steps the same way you did previously. Remove the test tube from the container, light the match, and remove your thumb. Place the match into the top of the test tube and observe the results.

Because there is no gas in the tube, the match will touch the water and be quenched. This part of the experiment proves that the oxygen in the “light” condition was produced by photosynthesis.