﻿ # 43 Effect of Carbon Dioxide on the Rate of Photosynthesis

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carbon dioxide concentration and ..

Average carbon dioxide concentration in Biosphere 2 substantially above free atmosphere levels (about 350 ppm)

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How Carbon Dioxide Concentration Affects Photosynthetic Rate

The experiment is repeated after adding some sodium hydrogencarbonate (which dissolves in water to produce carbon dioxide) to the water. It is observed that more oxygen bubbles are produced, and thus this shows the increased photosynthesis rate.

What was the minimum atmospheric CO2 concentration on this day? What time did it occur?

The black wiggles record the breathing of all the plants and animals on Earth. Plants must inhale carbon dioxide to grow and as they do so, they remove carbon dioxide from the atmosphere. Almost all animals and bacteria exhale carbon dioxide as they go about living. Animals and bacteria are always active and so carbon dioxide concentration increases whenever plants are inactive. There are more plants growing in the Northern Hemisphere because there is more land mass in the Northern Hemisphere, as a glance at a globe will confirm. When all the plants in the Northern Hemisphere are growing during the summer, they remove significant amounts of carbon dioxide. The maximums occurs every year in May, at the beginning of the growing season. The minimums occurs every year in November, at the end of the growing season. All of this is quite visible on the graph.

effect of carbon dioxide on rate of photosynthesis

how does the concentration of carbon dioxide affect the rate of photosynthesis?

Liquid carbon dioxide has become popular for many growers even though it is usually more expensive. The main advantages of using liquid CO2 include purity of product, no concerns about crop damage, nor heat or moisture production, better control of CO2 levels and the flexibility to introduce the CO2 within the plant canopy at any time. Pure CO2 is delivered in bulk by truck to the greenhouse. Special storage tanks rented from the supplier are required at every site (). The compressed CO2 is in a liquid state and must be vaporised through vaporiser units (). The distribution system for liquid CO2 in the greenhouse is simpler to design and install. Most growers use 18 mm black flexible polyvinyl chloride (PVC) tubing with holes punched at an appropriate spacing (). For a small operation the CO2 may be supplied in cylinders.


How does the concentration of Carbon Dioxide affect …

Carbon dioxide concentration

Place solution and leaves back into the cups and place
under the light source and record times of when each circle
floats to the top.
2 cups
Baking soda
2 syringes
Hole puncher
Dish soap
Fluorescent lamp
Stirring rod
Graduated cylinder
Independent variable: Amount of bicarbonate in solution (Carbon dioxide).
Dependent: Reaction rate of Photosynthesis
Control: Spinach leaves; # of circles; size of discs
The leaves within the baking soda solution raised at a much higher rate than that of the normal water solution cup.

Therefore, if there were to be an increase of the concentration of carbon dioxide, the rate of photosynthesis theoretically will increase as well, with the assumption of an unlimited water supply.
If the amount of carbon dioxide is increased, the rate of photosynthesis will increase as well.

If the concentration of carbon dioxide is increased, the photosynthesis reaction rate will be unaffected


Carbon dioxide concentration
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  • Influence of carbon dioxide concentration on the rate …

    Three factors can limit the speed of photosynthesis: light intensity, carbon dioxide concentration and temperature.

  • The Effect of Carbon Dioxide Concentration on the Rate …

    As carbon dioxide concentration increases, the rate of photosynthesis increases

  • carbon dioxide concentration, ..

    To investigate the effect of carbon dioxide concentration on the rate of photosynthesis Essay

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Carbon Dioxide Concentration Increasing carbon dioxide will ..

Rates of carbon dioxide supplementation are dependent on the crop response and economics. Flower and vegetable growers may take somewhat different approaches. In general, carbon dioxide supplementation of 1,000 ppm during the day when vents are closed is recommended. At 10% vent opening the CO2 supplementation can be shut off or reduced to 400600 ppm. In order to improve economic efficiency, CO2 levels can be set depending on light levels. The following is a recommended strategy for vegetable growers. On sunny days when the vents are closed, supplement with 1,000 ppm CO2 while on cloudy days when the light level is below 40 watts/m2 supplement with only 400 ppm CO2. However most flower growers will supplement with 1,000 ppm regardless of light levels. The environment computer can be set to adjust the CO2 level depending on the light measured but once the vents open beyond 10% or the second stage of exhaust fans becomes operational, the focus is to maintain a CO2 level in the crop canopy at 400 ppm.

The Effect of Carbon Dioxide Levels on Photosynthesis

Today, most growers monitor and control the greenhouse environment with sensors linked to a central computer to allow integration of the different environmental factors. A carbon dioxide controller, usually an infrared gas analyser (IRGA) is used to monitor and maintain the minimum and maximum CO2 level in the greenhouse. Usually a single IRGA is used per operation. Multiple readings within individual compartments or from different zones can be obtained by using a scanner or a multiplexer. The IRGA unit can be stand-alone or, as in most cases, connected to the environment control computer. In the latter case the environment control computer is used to control the CO2 level, through integration with light levels, stage of ventilation, and wind speed. Infra red gas analysers require routine calibration to insure accurate measurement of the CO2 levels.

photosynthesis increases with carbon dioxide concentration ; ..

Carbon dioxide can be obtained by burning carbon-based fuels such as natural gas, propane, and kerosene, or directly from tanks of pure CO2. Each source has potential advantages and disadvantages. When natural gas, propane or kerosene is burned, not only CO2 is produced, but also heat is generated that can supplement the normal heating system. However, incomplete combustion or contaminated fuels may cause plant damage. Most sources of natural gas and propane have sufficiently low levels of impurities, but notify your supplier of your intention to use the fuel for CO2 supplementation. Sulphur levels in the fuel should not exceed 0.02% by weight. Combustion of fuels also generates moisture. For natural gas it is estimated that about 1.4 kg of water vapour is generated for each m3 of gas burned. For propane the amount of moisture generated per kg of CO2 is slightly less than it is for natural gas.

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