Interactions of Limiting Factors (OCR GCSE Biology A, Combined (Gateway Science Suite)): Flashcards

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Interactions of Limiting Factors
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Limiting factor definition

Environmental condition restricting photosynthesis when scarce, even if other factors are abundant

Three examples of limiting factors

Light intensity, CO₂ concentration, temperature

Graph pattern when factor becomes limiting

Line increases then levels off/flattens

Effect of increasing light intensity

Raises rate until another factor becomes limiting

How farmers use limiting factors knowledge

Optimise greenhouse conditions (light, CO₂, temp)

Benefits of optimising photosynthesis in greenhouses

Faster plant growth and higher yields

Inverse square law relationship

Light intensity ∝1Distance2\propto \frac{1}{\text{Distance}^2}

Effect of doubling distance on light intensity

Falls to quarter (1/4) of original value

Formula: Light Intensity ∝\propto ?

1Distance2\frac{1}{\text{Distance}^2}

Light intensity at 2m from source (inverse square law)

14\frac{1}{4} of original (122=14\frac{1}{2^2} = \frac{1}{4})

Why understand inverse square law?

To manage light conditions for optimal photosynthesis

Why does photosynthesis rate graph level off?

Another factor becomes limiting

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