Question

concentration of what always increases rate of photosynthesis? ​

Answer 1

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concentration of what always increases rate of photosynthesis?

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The process by the which plants make their own food is called photosynthesis.

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Answer 2

Answer:

An increase in Carbon dioxide increases rate of photosynthesis

Explanation:

Carbon dioxide

An increase in the concentration of carbon dioxide gives an increase in the rate of photosynthesis. It is difficult to do this out in the open air but is possible in a greenhouse.

The rate of photosynthesis increases linearly with increasing carbon dioxide concentration (from point A to point B on the graph).

At a certain carbon dioxide concentration, the rate of photosynthesis remain constant (from point B to point C on the graph). Hence, a rise in carbon dioxide levels has no effect on the rate of photosynthesis as the other factors such as light intensity and temperature become limiting.

Many crops such as tomatoes and lettuce give higher yield when grown in greenhouses. Farmers add additional carbon dioxide into the greenhouse to increase the concentration and so the rate of photosynthesis of the crops. The additional cost of the carbon dioxide is worthwhile because of the increased yield.

Some companies have used this to great environmental use. Rather than pump waste carbon dioxide into the atmosphere as a pollutant they redirect it into big greenhouses where plants such as tomatoes use it during photosynthesis.

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Factors Affecting The Rate Of Photosynthesis

The term rate always involves time, so the rate of photosynthesis can be considered to be how fast photosynthesis takes place. This can be measured by the amount of glucose produced by a plant over a given time.

Factors affecting the rate of photosynthesis are:

1. Light

2. Temperature

3. Carbon dioxide

(In addition to the three factors above, other factors can be chlorophyll concentration, water and pollution. We will focus on the three main factors identified above in further detail.)

1. Light

The rate of photosynthesis increases when light gets brighter.

Refer to Figure 1, the rate of photosynthesis increases linearly with increasing light intensity (from point A to point B on the graph).

Gradually the rate falls and at a certain light intensity, the rate of photosynthesis remain constant (from point B to point C on the graph).

Hence, a rise in light intensity has no affect on the rate of photosynthesis as the other factors such as temperature and carbon dioxide become limiting.

Many plants spread out their leaves in such a way that each leaf maximises the amount of light falling on them and the lower leaves are not shaded by the ones above. Too much light at a high intensity can damage chloroplasts.

2. Temperature

The higher the temperature then typically the greater the rate of photosynthesis, photosynthesis is a chemical reaction and the rate of most chemical reactions increases with temperature. However

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