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Photosynthesis and Respiration in plants will be available on

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

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They do this by a process called Photosynthesis.

Light is a very important factor in the rate of photosynthesis, in my project I am going to test that plants do need light in order to photosynthesise.

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

Through reading various books and web pages it was made clear that carbon dioxide is definitely one of the raw materials needed for photosynthesis, but I wanted to see whether this is actually true and if carbon dioxide is taken away completely will the plant photosynthesize at all.

This is called photosynthesis, which means "making through light".

Background Knowledge: Photosynthesis is the process by which plants make their own food.

In , , a French pastor, showed that CO2 was the "fixed" or "injured" air and that it was taken up by plants in photosynthesis. Soon afterwards, showed that the increase in mass of the plant as it grows could not be due only to uptake of CO2, but also to the incorporation of water. Thus the basic reaction by which photosynthesis is used to produce food (such as glucose) was outlined.

The process of photosynthesis uses light, water and carbon dioxide in a series of two reactions; light reaction (which can only happen when light is available) and carbon fixation (which doesn’t require light). The net result of photosynthesis is the production of sugars (either in the form of glucose to be used, sucrose to be transported to other parts of the plant or starch to be stored) and the release of oxygen.

A summary of the inputs and outputs of photosynthesis is:

Variables: The variables that might affect the rate of photosynthesis in this experiment are: Temperature: When the temperature rises so does the rate of photosynthesis; this is because as the temperature around the plant rises the enzymes controlling photosynthesis inside the chloroplasts heat up and start moving around faster, the fast moving molecules collide with other fast moving enzymes causing them to react....

This process is also affected by the temperature surrounding the plant (the species of plant we experimented with, pond weed, photosynthesised best at around 20 degrees centigrade.) Light, temperature & CO2 are known as limiting factors, and each is as important as the next in photosynthes...

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  • The aim was to show that light is necessary for photosynthesis.

    I am trying to find out if the distance of the pond-weed from a lamp will change the rate of photosynthesis.

  • The way they do this is called photosynthesis.


  • Photosynthesis takes place in all plants that contain chlorophyll.

    Hypothesis: The rate of photosynthesis in the water plant hydrilla will change as the rate of carbon dioxide changes.

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Organisms Depend Upon Photosynthesis 1.

Key to photosynthesis is the presence of chlorophyll, a pigment which resides in the chloroplasts within plant cells. Chlorophyll is green, which is why most leaves are green (other pigments within the leaf are red, orange or yellow and these are sometimes more numerous, giving a different leaf colour, or show through when the chlorophyll pigments break down in autumn, hence the leaves changing colour). The primary sites for photosynthesis are on the leaves, although chloroplasts are generally also quite numerous in external stem cells.

Most food chains start with photosynthesizers.

The chemical equation of photosynthesis is: [IMAGE]6CO2 + 6H20 C6 H12 O6 + 6O2 it has been proven many times that plants need light to be able to photosynthesize , so you can say that without light the plant would neither photosynthesize or survive....

Photosynthesis is the procedure all plants go through to make food.

This process uses the sugars produced by photosynthesis and converts them into energy which the plant can use (this energy is contained within molecules called ATP – adenosine triphosphate). Oxygen is used in these reactions and, as well as charged up ATP molecules, the process releases water and carbon dioxide.

Photosynthesis is the method that plants use to make their own food.

The process by which plants convert sunlight into sugars is called photosynthesis. Plants then use the sugars to power their own metabolic processes by converting them to energy through a process called respiration. Below is a brief overview of both these processes.

Photosynthesis consists of two connected sets of reactions....

A first experiment to prove that the oxygen developed during the photosynthesis of green plants came from water, was performed by in and . He showed that isolated give off oxygen in the presence of unnatural reducing agents like iron oxalate , ferricyanide or after exposure to light. The Hill reaction is as follows

NOVA - Official Website | Illuminating Photosynthesis

The process of converting molecules into energy through oxidization. This is the opposite of photosynthesis, the biochemical process used by plants and some types of bacteria to convert light energy into chemical energy. .

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