Light and dark reactions in photosynthesis - eschooltoday

The rate of photosynthesis was recorded at a range of light Intensities and conditions.

Rising CO2 Leading to Changes in Land Plant Photosynthesis


I thought this because as the light intensity is becoming higher and
higher, I expected something to take over as the limiting factor (the
factor in the shortest supply, such as temperature or carbon dioxide
concentration), and prevent the plant from photosynthesising any
faster.

role of carbon dioxide in photosynthesis – …

Plants during photosynthesis use carbon dioxide. Rate of consumption varies with crop, light intensity, temperature, stage of crop development and nutrient level. An average consumption level is estimated to be between 0.12–0.24 kg/hr/100 m2. The higher rate reflects the typical usage for sunny days and a fully-grown crop.



My results do agree with my prediction to a certain extent, because I
predicted that the rate of photosynthesis would increase as the light
intensity did because the light provides energy for the reaction, and
the more energy the plant has, the faster it will be able to
photosynthesise.


Learn About Photosynthesis Formula - ThoughtCo

Photosynthesis is a process where by energy from light is harvested and used to drive synthesis of organic carbohydrates from carbon dioxide and water. Photosynthesis takes place in chloroplasts and can be divided into two steps: light reactions which require light and dark reactions which do not require light. During light reaction, light energy is captured by photosystems and electrons are transferred among the electron receptors. ATP and NADPH are generated. During dark reactions, CO2 is fixed using ATP and NADPH generated by the light reactions and organic carbohydrates are synthesized via the Calvin Cycle. When the CO2 is first fixed into a 3 carbon compound 3PGA, it is called C3 pathways and these plants are called C3 plants. The disadvantage of C3 plants is that they undergo photorespiration and thus waste some energy gained in light reactions. C4 cycle is the pathway adopted by C4 plants to bypass photorespiration.

The carbon dioxide molecule is linear and centrosymmetric

Field C and Mooney HA (1986) The photosynthesis‐nitrogen relationship in wild plants. In: Givnish TJ (ed.) On the Economy of Plant Form and Function, pp. 25–55. Cambridge: Cambridge University Press.

Chemistry for Biologists: Photosynthesis

Dark reaction – Calvin cycle
Second step of photosynthesis is called Calvin’s cycle. Because it does not require light, so it is called dark reaction. During dark reaction, the ATP and NADPH generated by light reaction are consumed to fix carbon dioxide into organic carbohydrates. The first fixed carbohydrate is a three carbon compound 3-phosphoglycerate (3PGA). The final product is a high-energy 3 carbon compound glyceraldehyde-3-phosphate (G3P) which can be used to synthesize a broad range of organic molecules. An important intermediate molecule for carbon dioxide fixation is ribulose bisphosphate (RuBP), and the enzyme catalyzing the CO2 fixation is Rubisco.

.Photsynthesis | Photosynthesis | Enzyme Inhibitor

The
variables, or factors that must be kept the same are as follows: -

* The carbon dioxide concentration must be kept the same, because
the more CO2 that is in the air, or water, then the more that can
diffuse into the leaf, and if the plant had more CO2 then it would
be able to photosynthesise faster.

13/11/2002 · .Photsynthesis - Download as PDF ..

Light reaction and photophosphorylation
Pigments embedded on thylakoid membranes form photosystems. There are of two types: PS I P700, PS II P680. Components of photosystem I and II transfer the electrons from water to NADP via cyclic electron transfer or non-cyclic electron transfer. During electron transfer, the light energy captured by the photosynthetic organisms is transformed into the phosphate bond energy of ATP. This is called photophosphorylation. NADPH is generated during non-cyclic electron transfer.