Photosynthesis and photography both involve light sensitive reactions. The leaves of plants containa green pigment called chlorophyll. This can absorb radiation in the visible region of theelectromagnetic spectrum and use this energy to synthesize chemicals and provide food for theplant.During photosynthesis, plants transform carbon dioxide and water into oxygen and sugars such asglucose:6CO2 (g) 6H2O(l) C6 H2 O6 (aq) 6O2 (g)Δg 2820kJ 2 + 2 → 6 12 6 + 2 = +2820kJIn the absence of sunlight, energy is no longer provided and photosynthesis ceases.Photosynthesis is a/an:
Correct answer: C. Endothermic reaction
- A. Exothermic reaction
- B. Addition reaction
- C. Endothermic reaction
- D. Substitution reaction
Explanation
endothermic process.The equation:6CO2 (g) + 6H2O (l) → C6H12O6 (aq) + 6O2 (g) ΔG = 2820 kJindicates that energy is absorbed (endothermic) to drive the reaction forward. The positive ΔG value suggests that the reaction requires energy to proceed, which is provided by light energy in the presence of chlorophyll.In the absence of sunlight, the energy source is removed, and photosynthesis ceases.
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About Scientific Reasoning
Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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