Photosynthesis occurs in two stages, the light-dependent stage and the light-independent (dark) stage - Leaving Cert Biology - Question c - 2019
Question c
Photosynthesis occurs in two stages, the light-dependent stage and the light-independent (dark) stage.
Two structures found in plant cells are shown below.
(i) In w... show full transcript
Worked Solution & Example Answer:Photosynthesis occurs in two stages, the light-dependent stage and the light-independent (dark) stage - Leaving Cert Biology - Question c - 2019
Step 1
In which of the two structures, A or B, does photosynthesis occur?
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Answer
Photosynthesis occurs in Structure B. This structure is indicative of chloroplasts where photosynthesis takes place.
Step 2
Give a balanced chemical equation to summarise the process of photosynthesis.
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Answer
The balanced chemical equation for photosynthesis is:
ightarrow C_6H_{12}O_6 + 6O_2$$
This equation summarizes the conversion of carbon dioxide and water into glucose and oxygen using light energy.
Step 3
Name two products of the light-dependent stage of photosynthesis.
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Two products of the light-dependent stage of photosynthesis are:
ATP (adenosine triphosphate)
NADPH (nicotinamide adenine dinucleotide phosphate)
These products are essential for the subsequent light-independent reactions.
Step 4
Outline the events of the light-independent stage.
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The events of the light-independent stage (Calvin Cycle) include:
ATP is converted to ADP + Pi, supplying energy for the process.
NADPH is oxidized to NADP+, providing electrons needed for the conversion of carbon dioxide.
Carbon dioxide is fixed and ultimately converted into glucose (or other carbohydrates) using the energy and reducing power generated in the light-dependent stage.
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