﻿ -The higher the light intensity, the faster the rate of photosynthesis is.

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## what factors affect the rate of photosynthesis?

Count bubbles of oxygen gas given off by elodea to determine the rate of photosynthesis.4.

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# how does light intensity affect the rate 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.

Prepare a graph of the collected data and analyze it.

Materials Needed:

(For each group of four students)

elodea (water plant) lamp (40 watt)
test tube razor blade (single-edge)
dechlorinated water (room temperature) tape
sodium bicarbonate powder (baking soda) clock or timer
metal stand with rod or test tube rack metric ruler

Strategy:

PART A.

## how does temperature affect the rate of 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.

Also, other variables, like temperature, light intensity, disk sizes, etc..., could be tested to determine to what extent each variable affects the rate of photosynthesis.

## how do you draw the data graphs for photosynthesis results?

This process is called photosynthesis. Temperature, carbon dioxide concentration and light intensity are factors that can limit the rate of photosynthesis.

Group 1
Period 5
Analysis
Research
What wavelengths of light (color) does chlorophyll use?
Blue portion of the electromagnetic Spectrum, then followed by the red portion.
Hypothesis
-The lower the light intensity, the slower the rate of photosynthesis is.

• ### Lab: Exploring the Rate of Photosynthesis ..

How does the rate of photosynthesis change when the light source is moved from a distance of 5 cm to 20 cm?3.

• ### Factors affecting the rate of photosynthesis in leafs

The amount of trapped light energy and the amount of carbon dioxide available affects the rate of photosynthesis.

• ### Biology Coursework : Rate of Photosynthesis

At low light intensities, if the light intensity is increased, the rate of photosynthesis increases.

## Analysing photosynthesis data using Excel - YouTube

Have students inspect the data. They need to analyze the data for changes in the laboratory variable(s) they studied. They can also look for other changes that might correlate to photosynthesis or respiration. Is there a pattern in the data?

## Photosynthesis Lab - Data Processing - YouTube

Hansatech Instruments is a small, British, scientific instrument company located in the heart of rural Norfolk. For over 35 years, our efforts have been concentrated towards the design & manufacture of high quality oxygen electrode and chlorophyll fluorescence measurement systems for the studies of cellular respiration & photosynthesis research.

## Import Data and Price of photosynthesis system | Zauba

Hansatech Instruments is a small, British, scientific instrument company located in the heart of rural Norfolk. For over 40 years, our efforts have been concentrated towards the design & manufacture of high quality oxygen electrode and chlorophyll fluorescence measurement systems for the studies of cellular respiration & photosynthesis research. Our product range covers a wide range of applications within the following fields of study:

## Data table of photosynthesis | …

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.

## Data Logger | Photosynthesis | Plants

Students will need to write a procedural plan for using WOW data to demonstrate that photosynthesis and respiration occur in a lake. The plan should be detailed enough for others to follow.

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