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In photosynthesis, which chemicals are needed for the light-dependent reaction? Tick (✓) one box - AQA - A-Level Biology - Question 7 - 2019 - Paper 2
Question 7
In photosynthesis, which chemicals are needed for the light-dependent reaction? Tick (✓) one box. Reduced NADP, ADP, Pi, water and oxygen. NADP, ATP and water. Re... show full transcript
Worked Solution & Example Answer:In photosynthesis, which chemicals are needed for the light-dependent reaction? Tick (✓) one box - AQA - A-Level Biology - Question 7 - 2019 - Paper 2
Step 1
Step 2
Describe what happens during photoinhibition in the light-dependent reaction.
Answer
During photoinhibition, chlorophyll absorbs light, which causes electrons to be excited and subsequently lost. This process results in chlorophyll becoming positively charged as it loses electrons, leading to a decline in the efficiency of photosynthesis.
Step 3
Explain why the student marked the origin using a pencil rather than using ink.
Answer
The student marked the origin with a pencil to prevent any ink from mixing with the pigments. Ink could diffuse into the chromatography solvent and contaminate the results, whereas pencil marks remain stable.
Step 4
Describe the method the student used to separate the pigments after the solution of pigments had been applied to the origin.
Answer
After applying the solution of pigments, the student used paper chromatography by placing the paper in a solvent. The solvent travels up the paper, carrying the pigments with it. Different pigments will travel different distances based on their solubility, resulting in separation.
Step 5
Step 6
Suggest and explain the advantage of having different coloured pigments in leaves.
Answer
Having different coloured pigments allows plants to absorb a wider range of wavelengths of light. This is advantageous for photosynthesis as it enables the plant to utilize light energy more efficiently across various light conditions, enhancing its ability to produce energy.