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Question 4

Photosynthesis needs an energy input as well as raw materials. Which input is it, and when can the reaction therefore take place?

  1. Heat energy, so it takes place whenever the air is warm
  2. Chemical energy from the soil, so it takes place at any time
  3. Light energy, so it takes place mainly during the night
  4. Light energy, so it takes place only while the plant is litBonne réponse

Explication

Light is the energy source that drives the reaction, so the raw materials simply sit unused in a leaf that receives none. Warmth is not a substitute, because heating a plant supplies no energy to the pigment that captures light, and a warm plant in an unlit room still builds no sugar.

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Question 4: Photosynthesis needs an energy input as well as raw… · Plants and Photosynthesis · Questena