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Photosynthesis (process and factors) — KCSE Biology

KCSE Biology · 68 practice questions · 4 syllabus objectives

11 easy47 medium10 hard

What You'll Learn

Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.

Write the overall equation for photosynthesis

State factors that affect the rate of photosynthesis

Describe the light and dark reactions of photosynthesis

Photosynthesis (process and factors)

Sample Questions

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1
easySHORT ANSWER4 marks

Write the overall equation for photosynthesis and name three factors that affect its rate.

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Part (a) — 4 marks
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ (in the presence of light and chlorophyll) (1 mk)
Light intensity (1 mk)
Carbon dioxide concentration (1 mk)
Temperature (1 mk)
2
easySHORT ANSWER4 marks

Write the overall equation for photosynthesis and name two factors that affect its rate.

View Marking Scheme
Part (a) — 4 marks
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ (in the presence of light and chlorophyll) (1 mk)
Light intensity (1 mk)
Carbon dioxide concentration (1 mk)
Temperature (1 mk)
3
easySHORT ANSWER2 marks

State the role of light in photosynthesis.

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Part (a) — 2 marks
Light provides energy for the light-dependent reactions and photolysis of water (1 mk)
Light energy absorbed by chlorophyll is used to produce ATP and NADPH needed for carbon dioxide fixation (1 mk)
4

<p>State three environmental factors that affect the rate of photosynthesis. <span class='marks'>[3 marks]</span></p>

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