Plate 1. Carbon dioxide generator.

Photosynthesis involves the conversion of light energy into chemical energy.

As a result the rate of photosynthesis is calculated.

For more than 30 years, research ships have cruised the world’s oceans, measuring carbon dioxide concentrations, ocean temperatures, winds, and other properties. The map shows the paths of research cruises conducted as part of the World Climate Research Programme’s Climate Variability and Predictability project. Cruise measurements—along with those from buoys, drifting floats, orbiting satellites, and land-based weather stations—are beginning to reveal long-term trends to ocean researchers. (Map by Robert Simmon, based on data from Dana Greeley, NOAA.)

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

The more carbon dioxide, the faster the rate of photosynthesis.

Prediction: I predict that the closer the light is to the pondweed the (or the higher the light intensity) the more oxygen will be produced until a certain point where the temperature or carbon dioxide levels will be the limiting factor.

Describe your prediction and rationale (i.e. how does photosynthesis change with light and why?)

Photosynthesis. Otosynthesis is the biological conversion of light energy into chemical energy. Is occurs in green plants, algae, and photosynthetic bacteria. Photsynthesis In Plants

As the sunlight quantity decreases the photosynthetic process decreases....


how is a leaf adapted for photosynthesis?

If the general trend continues, the concentration of carbon dioxide will be 400 PPM within ten years. It is hard to avoid this conclusion. Nothing short of a large volcanic eruption or a nuclear war or a large meteorite strike would change this conclusion.

what factors affect the rate of photosynthesis?

Photosynthesis can be measured in many ways as it involves the production of oxygen, the uptake of carbon dioxide and an increase in biomass. For example, aquatic plants release oxygen bubbles during photosynthesis and so these can be collected and measured. The uptake of carbon dioxide is more difficult to measure so it is usually done indirectly. When carbon dioxide is absorbed from water the pH of the water rises and so this can be measured with pH indicators or pH meters. Finally, photosynthesis can be measured through an increase in biomass. If batches of plants are harvested at a series of times and the biomass of these batches is calculated, the rate increase in biomass gives an indirect measure of the rate of photosynthesis in the plants.

how does light intensity affect the rate of photosynthesis?

The amount of carbon dioxide in the atmosphere is strongly correlated to temperature and glaciation. The record is jagged, but it is easy to see patterns. When the concentration is below 240 PPM, kilometers thick glaciers cover most of Europe, Canada and the northern part of the United States. There are 4 ice ages recorded here. Note that temperatures decrease irregularly over a span of approximately 100,000 years while temperature increases are sudden and dramatic. We live in an era just after a rapid temperature increase.

how does temperature affect the rate of photosynthesis?

As temperature increases, the rate of photosynthesis increases more and more steeply until the optimum temperature is reached. If temperature keeps increasing above the optimum temperature then photosynthesis starts to decrease very rapidly.

how do you draw the data graphs for photosynthesis results?

The idea seemed simple enough: the more carbon dioxide that people pumped into the atmosphere by burning fossil fuels, the more the oceans would absorb. The ocean would continue to soak up more and more carbon dioxide until global warming heated the ocean enough to slow down ocean circulation. Water trapped at the surface would become saturated, at which point, the ocean would slow its carbon uptake. To oceanographers of 30 years ago, the question was less, how will human emissions change the ocean carbon cycle, and more, is the ocean carbon cycle changing yet?