# Relationship between light intensity and photosynthesis

### RELATION BETWEEN LIGHT INTENSITY AND RATE OF PHOTOSYNTHESIS OF LOBLOLLY PINE AND CERTAIN HARDWOODS

The relationship between light, plant growth and photosynthesis is extremely The Effect Of Light Intensity On Rate Of Photosynthesis. A simple model for photosynthesis is described that leads to a new relation between production rate and light intensity. This relation gives a better fit to. Photosynthesis is light pugliablog.info low light intensities, light is a limiting factor for photosynthesis. The rate of photosynthesis to the light intensity is inversely.

## What happens during photosynthesis? - OCR 21C

A light source positioned at a distance from a photosynthesising plant The intensity of light at different distances from a light source can be described by the inverse square law. This states that the intensity of light is inversely proportional to the square of the distance from the source. In practical terms, this means that when the light is moved twice as far from the plant it will receive a quarter of the energy. Calculating light intensity Light intensity can be calculated using this formula.

• Photosynthesis

Carbon dioxide Carbon dioxide is needed for photosynthesis. Increasing the carbon dioxide concentration increases the rate of photosynthesis, provided the plant is warm enough, and has plenty of light and water. Graph showing rate of photosynthesis and carbon dioxide concentration Question What is limiting the rate of photosynthesis at points A and B on the graph?

What information from the graph can be used as evidence for this?

## RELATION BETWEEN LIGHT INTENSITY AND RATE OF PHOTOSYNTHESIS OF LOBLOLLY PINE AND CERTAIN HARDWOODS

Reveal answer up down The rate of photosynthesis at point A is being limited by the concentration of carbon dioxide. The evidence for this is that as the concentration of carbon dioxide is increased, the rate of photosynthesis also increases. The limiting factor at point B could be temperature or light intensity.

We know it is not carbon dioxide because any further increase in carbon dioxide does not increase the rate of photosynthesis. Adding different amounts of bicarbonate baking soda will allow you to see how adding CO2 will influence rate of photosynthesis. First boil and cool distilled water to drive off dissolved CO2 so that you can control this.

### UCSB Science Line

Obviously, I have not answered your question for dealing with the amount of water. This actually is a more difficult thing to test because measuring the oxygen produced is harder when you are not using an aquatic plant. If you just want numbers to plug into your model, take a look at this scientific paper: The water content is on the X bottom axis, while the Y up-and-down axis shows the rate of photosynthesis measured by how much CO2 the plant took up.

Note that the 2 different species responded differently.

Factors affecting photosynthesis-Light, temperature, water, CO2 /crash course.

You can also see that there is a lot of variation, but you can use the average photosynthetic rate for each water level. The scientists also looked at the effect of CO2 and temperature. Temperature would depend on light intensity, so you could use that in your model.

At low light intensities, light is a limiting factor for photosynthesis. The rate of photosynthesis to the light intensity is inversely proportional so it will increase rapidly at first the levels off until it reaches its optimum speed.

### BBC Bitesize - GCSE Biology (Single Science) - Photosynthesis – WJEC - Revision 2

It cannot photosynthesize any faster after that because there is only a certain number of chloroplasts containing a limiting amount of chlorophyll and this can only absorb a certain amount of light which is called the light saturation point.

Since there are many steps involved in photosynthesis and each step has its limiting factor, it can not be this simple. You can see that you definitely need water for the photosynthesis to go on.

But we say that water availability is only indirectly limiting photosynthesis because for the C4 plants, carbon dioxide is often the limiting factor.

See Pathways of Photosynthesis for some detailed information.