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7. For a given stomatal conductance, how will an increase inatmospheric CO2 influence the rate of photosynthesis?

How will this affect water-use efficiency in the plant?

How do you expect this would influence the distribution andabundance of different plant species?

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Nelly Stracke
Nelly StrackeLv2
29 Sep 2019

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Related questions

You need to

use outside sources (i.e., Internet, journal articles, other texts, etc.) to complete this assignment. Any additional research should be cited in APA format, and listed at the end of the assignment.

Tutorial: http://www.harcourtschool.com/activity/science_up_close/512/deploy/interface.html Watch and listen to the tutorial found in the link above. Fill in the following answers as you watch. Stop and replay anything you don’t understand – this is a complicated topic!

1. Plants use photosynthesis to make __________________ for the plant.

2. What do plants need in order to perform photosynthesis?

3. How is the plant able to obtain each “ingredient?”

4. Identify the plant cell organelle in which photosynthesis takes place.

5. Summarize the process of photosynthesis. Water and carbon enter the chloroplast…..

6. What happens to the oxygen that is produced as a result of photosynthesis?

7. Why is photosynthesis also important for people and animals?

Virtual Lab #1 - http://www.reading.ac.uk/virtualexperiments/ves/preloader-photosynthesis-full.html

Bubbles are given off by the plant through photosynthesis. By measuring the rate at which the bubbles are produced it is possible to tell how fast the plant is photosynthesizing. Read and follow the directions on how to use this lab simulator. Press start and record the bubbles per minute for each of the following light distances.

Then graph your data (be sure to label each axis)!

Distance (cm) Bubbles per minute

100 Y axis

120 i

150

180

200 X Axis

8. Based on your data, draw a conclusion regarding how light intensity affects the rate of photosynthesis. Virtual Lab #2 - http://www.kscience.co.uk/animations/photolab.swf

In this lab, you will be experimenting with how different variables affect the rate of photosynthesis.

9. Set the thermometer to 25°C (Room Temperature) and the light intensity to 20.

a. What were the bubbles per minute at this setting? ______ bpm

b. Now increase the CO2 available to the elodea. What were your bubbles per minute? ______ bpm

c. Based on your data, how does the amount of available CO2 affect the rate of photosynthesis?

10. Keep your settings from 9c (25°C, light intensity of 20, increased CO2).

a. What were the bubbles per minute at this setting? ______ bpm

b. Now increase the temperature to 40°C. What were your bubbles per minute? ______ bpm

c. Based on your data, how does an increase in temperature affect the rate of photosynthesis?

11. Return to your settings from 9c (25°C, light intensity of 20, increased CO2).

a. What were the bubbles per minute at this setting? ______ bpm

b. Now decrease the temperature to 10°C. What were your bubbles per minute? ______ bpm

c. Based on your data, how does a decrease in temperature affect the rate of photosynthesis.

12. Alter the variables in order to determine which combination leads to the highest rate of photosynthesis. Which combination of settings produced the highest number of bubbles per minute? a. Temperature: ________

b. Light: ________

c. CO2: ________

Photosynthesis Tutorial: http://www.phschool.com/science/biology_place/biocoach/photosynth/overview.html

Use this site to answer questions about photosynthesis.

13. In the blank portion of this paper, draw the picture which shows the overall process of photosynthesis.

14. Write the chemical equation for photosynthesis.

15. Photosynthesis converts _________________ energy into the ____________________ energy of sugars and other organic compounds.

The blue part of the light spectrum has been associated with leaf characteristics which also develop under high irradiances. In this study blue light dose–response curves were made for the photosynthetic properties and related developmental characteristics of cucumber leaves that were grown at an equal irradiance under seven different combinations of red and blue light provided by light-emitting diodes. Only the leaves developed under red light alone (0% blue) displayed dysfunctional photosynthetic operation, characterized by a suboptimal and heterogeneously distributed dark-adapted F v /F m , a stomatal conductance unresponsive to irradiance, and a relatively low light-limited quantum yield for CO 2 fixation. Only 7% blue light was sufficient to prevent any overt dysfunctional photosynthesis, which can be considered a qualitatively blue light effect. The photosynthetic capacity (A max ) was twice as high for leaves grown at 7% blue compared with 0% blue, and continued to increase with increasing blue percentage during growth measured up to 50% blue. At 100% blue, A max was lower but photosynthetic functioning was normal. The increase in A max with blue percentage (0–50%) was associated with an increase in leaf mass per unit leaf area (LMA), nitrogen (N) content per area, chlorophyll (Chl) content per area, and stomatal conductance. Above 15% blue, the parameters A max , LMA, Chl content, photosynthetic N use efficiency, and the Chl:N ratio had a comparable relationship as reported for leaf responses to irradiance intensity. It is concluded that blue light during growth is qualitatively required for normal photosynthetic functioning and quantitatively mediates leaf responses resembling those to irradiance intensity.

What is the additional materials and equipment needed and what is the possiable issue and what is the data that author tried to observed in this experiments and what relvent to and what the author trying to summerize?

During photosynthesis, a plant translates CO2, waterand light into O2. I assume the carbon C is further usedfor the growing process. I wonder how the plant growsbefore the time where photosynthesis is possible, i.e.before there are even leaves, in which photosynthesis occurs.

To what extent does the plant grow from the seed/the minerals inthe ground?

How much carbon are relevant for which parts of the plant and atwhat times of the evolution of the plant?

I don't know if there are only these life periods of the plant,i.e. if there are other major biochemist-of-growing changes, thanin the comparison before and after the plant got leaves. So arethere other relevant aspects to this? If there are leavespresent, is the rigid structure of the plant only coming from theCO2 in the air and not from the ground anymore?

The answer will probably depend on the plant. So here is anotherformulation of the question:

What are typical characteristics of different plants in thisregard? I.e. how do common species of plants manage their Cconsumption before (and after) the development of leaves?

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