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What is the effect of light intensity on the rate of photosynthesis

Photosynthesis requires the following resources; Carbon Dioxide, Water and light.

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Light Intensity in Plant Growth and Development

The Effects of pH Levels and Phosphorous on the Photosynthesis Process of Aquatic PlantsStudy the coniferous spruce tree (Picea glauca as the species of choice) by measuring its lateral and sub-lateral branch angles in order to see how it collects sunlight from various angles on its south-facing side.

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

Background information: Photosynthesis Photosynthesis is the process of autotrophs turning carbon dioxide and water into carbohydrates and oxygen, using light energy from sunlight.

Low light intensity lowers the rate of photosynthesis

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

Now we’ve covered the basics of light intensity and depth penetration. Join us in the next part of the blog series, where we will go into the testing of grow-light footprint and space coverage.

It will be very interesting to see how light will influence the rate of photosynthesis in plants and what will happen if they do not get the required light in order to produce starch .

How Light Intensity Affect Photosynthesis Essay …

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

I think this because the plant may use up all of the carbon dioxide (Sodium hydro carbonate) and the plant can have as much light as it needs but if it does not have any carbon dioxide it will not be able to photosynthesise....

The measurement of the amount of light that we give to our plants is called PAR (Photo-synthetically Active Radiation). This is a measurement of the amount of photons that a plant can use to photosynthesise with in a given area in a certain length of time. It is measured in something called PPFD (Photosynthetic Photon Flux Density) and the unit of measurement of PPFD is micromoles per square metre per second (umol/m2/s). It is measured between the wavelengths of 400nm to 700nm. There is no weighting given to one particular colour or wavelength range. All photons in the range 400nm to 700nm are counted the same:

The rate of photosynthesis was measured at 4 other light intensities of 80, 350, 150, 60 and 0-μmol photons m-2 s-1.
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  • How does the level of light affect the rate of photosynthesis

    This will be done by measuring the bubbles of oxygen and having a bulb for the light intensity variable.

  • Six facts about photosynthesis - KScience

    Michael states that a higher light intensity would increase the rate of photosynthesis, however, Reona disagrees.

  • The energy for photosynthesis comes from light

    Photosynthesis is the process of converting light energy into chemical potential energy and storing it as starch....

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BBC - GCSE Bitesize: Photosynthesis

Plant leaves can only really make good use of a certain amount of photons in any given 24 hour period. Plant leaf cells contain special little “factories” called chloroplasts which is where all the photosynthesis happens. Just like any factory, they have a limited production rate. Chloroplasts can only capture light photons and use carbon dioxide and water to make sugar at a certain rate, then they need time to recover.

The Process of Photosynthesis in Plants: An Overview

A healthy plant leaf can withstand quite a lot of light but only for a short period of time. The ppfd could be 1500-2000 umol/m2/s for perhaps an hour or 2 (like the midday sun might provide at the equator) and no damage would occur. Some strains of plant will yield their maximum when given around 1500 umol/m2/s. Over this and there is risk of leaf bleaching and burn. Most high power grow lights get HOT. If you have a plant close enough to a hydroponics grow light that it is getting more than 1500 umol/m2/s then you will possibly find that the leaf temperature is too high for maximum photosynthesis anyway!

Cellular Respiration and Photosynthesis

Results were
Things to remember!
When there is no light, photosynthesis can't occur since light is the activation energy needed for plants to convert carbon dioxide and water to glucose and oxygen
When there is no light, the plants would use up oxygen therefore emitting carbon dioxide bubbles instead.
The plants should be given a couple minutes to start initiating the process of photosynthesis before you start timing.
The Scenario:
Reona and Michael have been growing aquatic plants for a while, specifically Elodeas which is a type of pond weed.

Primary Productivity & Dissolved Oxygen Lab - …

Our Li-Cor Radiometer / Photometer (pictured below) and its special Quantum sensor, measures PAR very accurately. It allows us to get a much more meaningful measurement of how much plant-usable light that a grow light is giving out. However, even PAR measurement is not perfect! The above chart shows the McCree curve spectrum which is the amount of photosynthesis response a plant has over the light spectrum. But we can accept that PAR is a far superior way of measuring plant usable light compared to measuring lumens.

LabBench Activity Dissolved Oxygen and Aquatic Primary Productivity

recording of the time.
increase the values of light intensity tested on the plant
Measurement is not too accurate.
Experiment Complete!
How does light intensity affect the Rate of Photosynthesis?
Michael Kwon, Reona Ido
Biology 11

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