B1.4.4 Interaction Of Limiting Factors Flashcards

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1
Q

How can you investigate the rate of photosynthesis?

A

Using pondweed, volume of oxygen given off is a measure of the rate of photosynthesis
This can be measured by simply counting the no. of bubbles produced

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2
Q

What is the inverse square law?

A

When you double the distance from a light source, the light intensity falls by a factor of four.

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3
Q

What is the formula for relative light intensity?

A

relative light intensity = 1/distance from light source^2

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4
Q

On a cloudy day, what happens to the rate of photosynthesis?

A

It decreases as the light intensity decreases

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5
Q

What is the limiting factor on a cold sunny winters day?

A

The temperature

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6
Q

Why do commercial growers increase levels of carbon dioxide in their greenhouses?

A

Carbon dioxide concentration in the atmosphere is low, and is often a limiting factor to photosynthesis.
Increasing the level in greenhouses makes sure there is enough for the plants to continue growing quickly.

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