Edexcel IGCSE Biology 2.18 photosynthesis and light energy

Practise explaining photosynthesis as light energy transfer into chemical energy, using chloroplasts, glucose production and plant growth contexts.

Exam points

explain how chlorophyll and chloroplasts absorb light for photosynthesis and glucose production
link reduced photosynthesis to slower growth, less starch or less biomass in plant contexts
calculate carbohydrate yield per area or time from plant production data

[Maximum number: 3]

Tobacco mosaic virus infects plant cells.
The photograph shows some of the virus particles.

Figure for Question 2.18 Photosynthesis and energy conversion question 1 — Edexcel IGCSE Biology

The photograph shows the leaves of a plant infected by tobacco mosaic virus.

Plants cells infected with the virus stop making chloroplasts.
Explain why plants that are infected with the virus grow more slowly than uninfected plants.

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2.18 Photosynthesis and energy conversion question 1