Determining the Intercept of a Graph (AQA A-Level Biology): Quizzes

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Determining the Intercept of a Graph
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What is an intercept on a graph?

Point where graph crosses an axis

Where does the x-axis intercept occur on a graph?

Where y = 0 (horizontal axis)

Where does the y-axis intercept occur?

Where x = 0 (vertical axis)

When should you use extrapolation to find an intercept?

When intercept lies outside plotted data

In the osmosis example, what was the x-axis intercept value for the potato's water potential?

-250 kPa

What does the intercept represent in the osmosis worked example?

No net water movement occurs

What is the compensation point in photosynthesis?

Where photosynthesis equals respiration

What was the compensation point value in the photosynthesis worked example?

5000 lux

What happens below the compensation point in photosynthesis?

More CO2CO_2 from respiration than photosynthesis

How should you state intercept values in exam answers?

With appropriate units and precision

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