The Relationship Between Light Intensity and the Rate of Photosynthesis

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Recommended: Growth comparison between plants in the dark and plants in the light

The Relationship Between Light Intensity and the Rate of Photosynthesis

Investigate the relationship between light intensity and the rate of

photosynthesis.

Photosynthesis is important because animals eat food, as it is a

source of energy. All living things need a constant supply of energy

if they are to grow, reproduce or move. Plants do not eat food but

they do have some in the form of starch in their leaves.

The symbol equation for photosynthesis is:

6 CO2+6 H2O-light C6 H12 06+6 02.

There are four substances needed for photosynthesis to tae place:

-Carbon dioxide.

-Chlorophyll.

-Oxygen.

-Sunlight.

Photosynthesis cannot take place without all four of these substances

being present.

As light is the factor I am exploring in this investigation, that is

the main factor I am looking at.

Plants need light for photosynthesis to take place; photosynthesis

will not take place in the dark.

It is true that the brighter the light, the greater the rate of

photosynthesis. Many plants have their leaves spread out in such a way

that each leaf has as much light as possibleand the lower leaves are

not shaded by the ones above.

I am investigating the effects of light on the rate of photosynthesis.

It is possible to do this by measuring the rate of photosynthesis at

different light intensities by counting the number of bubbles of gas

given off by the plant in a given time.

To make the test fair I will use the same amount of water and the leaf

from the same plant.

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Test tube light

================================================================================================================================================================================================================================

Funnel

Beaker

plasticine

pond weed

Method.

I can do this by setting up the diagram above. You need to get a

beaker and place two pieces of plasticine inside to hold down the

funnel. Then place the plant weed inside the funnel. Put a test tube

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