Three factors can limit the rate of photosynthesis will decrease.

In this experiment we were told that we would be measuring the rate of photosynthesis.

Limiting Factors of Photosynthesis.

As we can see, there is a close relationship between the action spectrum and absorption spectrum of photosynthesis. There are many different types of photosynthetic pigments which will absorb light best at different wavelengths. However the most abundant photosynthetic pigment in plants is chlorophyll and therefore the rate of photosynthesis will be the greatest at wavelengths of light best absorbed by chlorophyll (400nm-525nm corresponding to violet-blue light). Very little light is absorbed by chlorophyll at wavelengths of light between 525nm and 625 (green-yellow light) so the rate of photosynthesis will be the least within this range. However, there are other pigments that are able to absorb green-yellow light such as carotene. Even though these are present in small amounts they allow a low rate of photosynthesis to occur at wavelengths of light that chlorophyll cannot absorb.

Photosynthesis need light to work, so light therefore should speed up the rate of photosynthesis.

Plants;.Factors affecting the rate of photosynthesis.

As seen in the chart, these pigments favor the violet-blue light, so it can be deduced that plants under this light source will have a faster photosynthetic rate and green will prevent the process.
ruler
Spinacia oleracea (spinach)
fluorescent light bulbs (60-100watt) in blue, red, green, and regular colors.
water
baking soda
soap
paper towels (for clean up)
beakers for the solutions (500 mL is sufficient)
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Methodology: Procedure
Part I.
1.

Aim: To see if raising the light intensity increases the rate of photosynthesis.

Research and
Design, evaluation
(40 min) Keywords:
Limiting factor Peer assess&
6 mark q-
what’s
in a good
answer Starter
5 min By the end of this lesson you will…
Recap what the limiting factors of photosynthesis are
Explain how conditions in greenhouses can be controlled
to optimise the growth of plants.
Evaluate the benefits of artificially manipulating the
environment in which plants are grown.

Prediction:I predict that raising the light intensity will increase the rate of photosynthesis.


The three main things affecting the rate of photosynthesis are: 1.

Prediction : I predict that as I increase the distance between the light source and the Canadian Pondweed (reducing the light intensity), the volume of oxygen produced within the time limit (the measure of the rate of photosynthesis) will decrease.

Light.A good ppt about limiting factors on photosynthesis.

Therefore in graph (c) the horizontal axis could be also labelled relative light intensity, a proportional linear relationship with the rate of photosynthesis.

Photosynthesis limiting factors ppt.

So how can these factors have an effect on the rate of photosynthesis? Lets start off with the light intensity. When the light intensity is poor, there is a shortage of ATP and NADPH, as these are products from the light dependent reactions. Without these products the light independent reactions can't occur as glycerate 3-phosphate cannot be reduced. Therefore a shortage of these products will limit the rate of photosynthesis. When the carbon dioxide concentration is low, the amount of glycerate 3-phosphate produced is limited as carbon dioxide is needed for its production and therefore the rate of photosynthesis is affected. Finally, many enzymes are involved during the process of photosynthesis. At low temperatures these enzymes work slower. At high temperatures the enzymes no longer work effectively. This affects the rate of the reactions in the Calvin cycle and therefore the rate of photosynthesis will be affected.

Plants;.What are some of the factors that affect photosynthesis?

A limiting factor is a factor that controls a process. Light intensity, temperature and carbon dioxide concentration are all factors which can control the rate of photosynthesis. Usually, only one of these factors will be the limiting factor in a plant at a certain time. This is the factor which is the furthest from its optimum level at a particular point in time. If we change the limiting factor the rate of photosynthesis will change but changes to the other factors will have no effect on the rate. If the levels of the limiting factor increase so that this factor is no longer the furthest from its optimum level, the limiting factor will change to the factor which is at that point in time, the furthest from its optimum level. For example, at night the limiting factor is likely to be the light intensity as this will be the furthest from its optimum level. During the day, the limiting factor is likely to switch to the temperature or the carbon dioxide concentration as the light intensity increases.

Factors affecting photosynthesis.

Scrap yard
Challenge 50 min Keywords:
chlorophyll, chloroplast, stomata, guard cells, palisade layer,
air spaces, xylem, mesophyll Re-cap
5 min Starter
5 min By the end of this lesson you will…
Name the different parts of a leaf
Relate its structure to function
Explain how leaves have adapted for their function photosynthesis lesson 6-
leaf structure Scrap yard
Challenge 50 min Keywords:
chlorophyll, chloroplast, stomata, guard cells, palisade layer,
air spaces, xylem, mesophyll Re-cap
5 min Starter
5 min By the end of this lesson you will…
Name the different parts of a leaf
Relate its structure to function
Explain how leaves have adapted for their function The Lesson Map Mind map Plant dating You will be handed your task sheet- eyes to yourself- everyone’s score counts Scrap yard challenge 2 Recap: Plant Dating
10 min Scrap yard
Challenge 2 20 min Keywords:
chlorophyll, chloroplast, stomata, guard cells, palisade layer,
air spaces, xylem, mesophyll, limiting factors, photosynthesis Mind map
25 min By the end of this lesson you will…
Recap leaf adaptations and structure
Recap limiting factors
Recap photosynthesis The Lesson Map Plant Dating
10 min Scrap yard
Challenge 2 20 min Keywords:
chlorophyll, chloroplast, stomata, guard cells, palisade layer,
air spaces, xylem, mesophyll, limiting factors, photosynthesis Mind map
25 min By the end of this lesson you will…
Recap leaf adaptations and structure
Recap limiting factors
Recap photosynthesis lesson 7- recap