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. Reduced NADP, ATP, water and carbon dioxide. NADP, ADP, Pi and water. --- 07.2 Describe what happens during photoionisation in the light-dependent reaction. --- A student obtained a solution of pigments from the leaves of a plant. Then the student used paper chromatography to separate the pigments. Figure 5 shows the chromatogram produced. --- 07.3 Explain why the student marked the origin using a pencil rather than using ink. --- 07.4 Describe the method the student used to separate the pigments after the solution of pigments had been applied to the pigment.

A-Level AQA Biology Chromatography of Photosynthetic Pigments: In photosynthesis, which chemica

In photosynthesis, which chemicals are needed for the light-dependent reaction? Tick (✓) one box - AQA - A-Level Biology - Question 7 - 2019 - Paper 1

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 1

Step 1

Which chemicals are needed for the light-dependent reaction?

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Answer

The correct chemicals needed for the light-dependent reactions of photosynthesis included NADP, ADP, Pi, and water. Therefore, the correct response is:

NADP, ADP, Pi and water.

Step 2

Describe what happens during photoionisation in the light-dependent reaction.

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Answer

During photoionisation, chlorophyll absorbs light energy.

This energy excites electrons within the chlorophyll, allowing them to move away from the chlorophyll molecule. As a result, electrons are lost, and the chlorophyll molecule becomes positively charged, facilitating the transfer of these electrons to an electron transport chain.

Step 3

Explain why the student marked the origin using a pencil rather than using ink.

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Answer

The student marked the origin with a pencil because ink would mix with the solvent during the chromatography process, potentially causing contamination and affecting the results.

Step 4

Describe the method the student used to separate the pigments after the solution of pigments had been applied to the pigment.

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Answer

The student applied the solution of pigments onto the chromatography paper and then immersed the paper into a solvent.

The solvent travels up the paper, carrying the pigments with it. Different pigments travel at different rates, leading to the separation of the pigments based on their solubility and affinity for the paper.

In photosynthesis, which chemicals are needed for the light-dependent reaction? Tick (✓) one box - AQA - A-Level Biology - Question 7 - 2019 - Paper 1

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 1

Which chemicals are needed for the light-dependent reaction?

Describe what happens during photoionisation in the light-dependent reaction.

Explain why the student marked the origin using a pencil rather than using ink.

Describe the method the student used to separate the pigments after the solution of pigments had been applied to the pigment.

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