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Edexcel IGCSE Biology 5.2 Effects on crop yield of increased carbon dioxide

Practise linking CO2 and temperature in glasshouses to photosynthesis, crop yield, limiting factors and investigation design.

Syllabus
First assessment 2019
Course
Biology 4BI1

Exam points

  • design glasshouse trials using several CO2 concentrations, controls, repeats and crop yield data
  • explain why higher CO2 or temperature can increase photosynthesis until another factor limits yield
  • discuss sustainable glasshouse systems using supplied light, heat and CO2 for tomato crops

5.2 Effects on crop yield of increased carbon dioxide question 1

[Maximum number: 4]

Farmers can increase their crop yield by growing crops in a temperature controlled glasshouse.

Question (a)

(a)

Explain how increasing the temperature can result in an increase in crop yield.

[ 2 ]

Question (b)

(b)

Farmers sometimes use a type of heater that burns gas or oil to raise the temperature of their glasshouse to improve crop yield.

Explain why they use this type of heater to improve crop yield.

[ 2 ]
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