- Proportion -

• As light intensity increases, the rate of photosynthesis also increases
• Photosynthesis is an energy-requiring, endothermic reaction
• More light energy increases the rate at which oxygen is given off, resulting in more bubbles of oxygen produced per minute
• There is an inverse relationship between distance and light intensity
• As distance increases, light intensity decreases
• As the distance away from a light source increases, light energy becomes spread over a wider area
• Light energy is proportional to the square of the distance of the light source from the plant