What is photosynthesis?
The process by which plants use light energy to synthesise carbohydrates from carbon dioxide and water.
Cambridge IGCSE (9–1) Biology 0970 (Extended) (2026–2028) · 6.1
Revise Cambridge IGCSE (9–1) Biology 0970 (Extended) (2026–2028) specification point 6.1, Photosynthesis, with free active-recall flashcards. Flip through the set or review every question and answer below.
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What is photosynthesis?
The process by which plants use light energy to synthesise carbohydrates from carbon dioxide and water.
What is the word equation for photosynthesis, including the conditions required?
Carbon dioxide + water → glucose + oxygen, in the presence of light and chlorophyll.
What is chlorophyll and where is it found?
A green pigment found in chloroplasts.
What role does chlorophyll play in photosynthesis?
It transfers energy from light into chemical energy used to synthesise carbohydrates.
Which three factors affect the rate of photosynthesis?
Light intensity, carbon dioxide concentration, and temperature.
How does increasing light intensity or carbon dioxide concentration affect the rate of photosynthesis?
The rate rises if that factor is limiting, until another factor becomes limiting.
How does temperature affect the rate of photosynthesis?
The rate generally rises towards an optimum temperature, then falls at higher temperatures.
How can the effect of one factor on photosynthetic rate be investigated?
Vary that factor, measure a consistent indicator of photosynthetic rate, and control other relevant conditions.