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Cambridge IGCSE Biology practice

Paper 4 structured question: Photosynthesis

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Photosynthesis

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Paper 4Theory (Extended)5 marks

Plants require certain environmental conditions for photosynthesis to occur efficiently.

Description

Limiting Factors in Photosynthesis

The rate of photosynthesis depends on light intensity, carbon dioxide concentration, and temperature. Each of these factors can limit the rate if they are not at optimal levels.

  1. a

    Identify two limiting factors that affect the rate of photosynthesis.

    Aim for approximately 2 distinct marking points.

    [2]
  2. b

    Explain why temperature can limit the rate of photosynthesis.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 4 structured question: Photosynthesis

Paper 4Theory (Extended)3 marks

Data Table

Photosynthesis Rate Under Different Conditions

ConditionPhotosynthesis Rate (arbitrary units)
Low light, normal CO2, normal temperature20
High light, low CO2, normal temperature15
High light, normal CO2, low temperature10
High light, normal CO2, high temperature5
  1. a

    Identify the limiting factor in the condition with photosynthesis rate of 15 units.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Explain why photosynthesis rate is lowest at high temperature in the table.

    Aim for approximately 2 distinct marking points.

    [2]