Measuring the rate of photosynthesis - Science and …

The Z Scheme diagram shows the pathway of an electron fromwater (lower right) to NADP+ (upper left). It also shows theenergy relationships which are measured as voltage potentialshown on the scaleon the right. To raise the energy of theelectrons derived from water (+0.82 volts) to the level necessaryto reduce NADP+ to NADPH (-0.32 volts), each electron must beboosted twice (vertical red arrows) by light energy absorbed inPhotosystems I and II. After each boosting , the energizedelectrons flow "downhill" (diagonal black lines) and inthe process transfer some of their energy to a series ofreactions which ultimately adds a phosporus to ADP to producehigh energy ATP and reduces NADP+ to NADPH. There is analternative shunt whereby the electron flow turns back tocytochrome b563 (green line)and this is called and it occurs when there is no need for NADPH, so onlyATP is produced.

Methods to Calculate the Rate of Photosynthesis | …

Note that in terms of the cycling ofcarbon,

There are a few key methods to calculate the rate of photosynthesis

Photoaututrophs utilize sunlight for energy and CO2 for theircarbon source by this process of PHOTOSYNTHESIS whereby sunlightis absorbed by a complex compound known as chlorophyll andconverted to energy which drives a series of chemical reactionsthat ultimately removes hydrogen from water or other compoundsand then combines the hydrogen with carbon dioxide in a way thatproduces sugars.

Lab: Exploring the Rate of Photosynthesis - The Biology …

Photosynthetic organisms can be divided into two classes:those which produce oxygen and those which do not. Photosyntheticbacteria do not produce oxygen (in fact some of them calledanaerobes cannot tolerate oxygen) and this is considered a moreprimitive type of photosynthesis (in which the hydrogen donor ishydrogen sulfide, lactate or other compounds, but not water).Plants and one type of bacteria (cyanobacteria) do produceoxygen, an evolutionarily more advanced type of photosynthesis(in which the hydrogen donor is water).

Aim: We will be trying to see if light intensity has an effect on the rate of photosynthsis.
Different colors of light changed to see how each color effects the photosynthetic rate.

How to measure photosynthesis? | Carbon Tree

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 400–600 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.

Productioncan also be quantified by measuring the rate of new biomass accumulationover time.

Go horizontally to the net rate of photosynthesis axis (on …

I will
then flood the elodea wit light as in the preliminary experiment to
get it photosynthesizing for about ten minuets, after I will set the
light intensity to 80mv using a comparator as light intensity must be
keep constant to ensure accurate result.

The following diagram  illustrates how this worksin terms of the energy losses at each level.

How Does Photosynthesis Affect the Atmosphere of the Planet?

Although the optimal CO2 level increases with increasing light levels, it is often wasteful, depending on wind speed, to attempt to maintain a rate of 1,000 ppm supplementation when vents are more than 10%–15% open or the full complement of exhaust fans are operational. Growers should however, aim to maintain ambient levels within the crop canopy. The increased air circulation enhances the rate of diffusion by reducing the boundary layer around the leaf surface.