Lab # 5

Part1

The propose of the lab is to know and prove if our hypothesis was wrong or right. Two different ways how the lab was doing. To prove the hypothesis is necessary to leave the planting seeds in two different environments so, the first one was in on environment where the seeds can receive sun light so that the plants can do photosynthesis. The other one was in a dark place.

Hypothesis

The seeds cannot germinate in dark places. It was wrong because when the different trays were open the one that was in the dark germinate but not the same and different color as the one that was outside. The tray that was outside germinate better and the plants were color green, and the one that was in the dark germinate but most of the plants were almost dead and the color yellow.

Start to count the germinate plants was the next step. Each group planted 4 seeds per cup in 36 cups for every example. The data of the plants that were planted in the dark place were 50 germinate plants.

Then started measuring all the seeds that were germinated and the average was 15cm.

Part 2

1.    What was the control for this experiment?

The control for this experiment was the following: first put two trays in different places so, one has to be in a dark place and the second one has to be somewhere that has enough sun light. Then take care about the one that is outside like watering and see if the plants have their needs.

2.    What is the percent germination for the light treatment and for the dark treatment?  

The percent germinate of this was 50/144*100=34.72%

The percent germinate of this was 69/144*100=47.9%

Part 2 GPP and NPP

Step 1, step 2, step 3, step 4

Once you have measured the seedlings and gathered the data for part 1 carefully pull out each seedling gently from the soil. Then once you have all the seedlings with the roots separated from the soil weight the plants on the scale. Place all the sprouts on a piece of aluminum to weight the mass. Once it is done then put the plants in the oven so de plants can get dry and then weight the mass after try them.

Weight before 8.9g

Weight after 1.9g

Then calculate the GPP and NPP.

NPP+R=GPP

2.0g  +  1.9g  =  3.9g

·         Different between dark treatment and light treatment.

The different between both treatments is because the one that was in dark place the plants germinate but with different color (yellow), and most of them start to die because of the lack of sunlight and water. The treatment that was outside was more alive because most of the plants were color green and almost most of them germinate and grow as a plant. Also the percent of germination was higher.

·         Explain why that growth may have take place even though light was not present.

Because even though the treatment that was in the dark did not receive sunlight was present water, and so many nutrients from the soil, so that is sufficient to permit the plants germinate but not with the same characteristics as the one that was outside receiving sunlight and water.

·         Using the calculations of the class’ data make 3 graphs showing the different in respiration, net primary productivity, and gross primary productivity.