Limiting Factors Graphs Flashcards

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In a photosynthesis graph, what is meant by a limiting factor?

It is the factor in shortest supply that stops the rate increasing further.

On most photosynthesis graphs, what do the x-axis and y-axis show?

The x-axis shows a factor, like light or temperature. The y-axis shows the rate of photosynthesis.

On a graph of rate against light intensity, what happens at low light levels?

The rate increases steadily as light increases, so light is the limiting factor.

On a light intensity graph, how can you tell when light is no longer the limiting factor?

The line goes flat; increasing light does not increase the rate any more.

What pattern do you see on a graph of rate against carbon dioxide concentration?

The rate rises as carbon dioxide increases, then levels off when another factor is limiting.

What does a temperature–rate graph for photosynthesis look like?

The rate rises as temperature increases to an optimum, then falls at higher temperatures.

Why does the rate of photosynthesis fall at very high temperatures on the graph?

Enzymes that control photosynthesis denature at high temperatures, so the rate drops.

What is the optimum temperature shown on a photosynthesis–temperature graph?

It is the temperature at which the rate of photosynthesis is highest.

On a graph, what does a steep straight line section tell you about the limiting factor?

The factor on the x-axis is limiting, so changes in it strongly affect the rate.

If one graph line is higher than another at the same light level, what does this show?

Another factor, such as carbon dioxide, is more available, so the rate can be higher.

How can graphs help a farmer choose whether to add more light or more carbon dioxide?

Graphs show which factor still increases the rate; that factor should be improved.

How do you find the rate of photosynthesis at a given factor value on a graph?

Go from the value on the x-axis up to the line, then across to read the rate on the y-axis.

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