Where in a plant cell does photosynthesis take place?
Give the alternative name of the first stage of photosynthesis - Leaving Cert Biology - Question 14(a) - 2010
Question 14(a)
Where in a plant cell does photosynthesis take place?
Give the alternative name of the first stage of photosynthesis.
During the first stage of photosynthesis ener... show full transcript
Worked Solution & Example Answer:Where in a plant cell does photosynthesis take place?
Give the alternative name of the first stage of photosynthesis - Leaving Cert Biology - Question 14(a) - 2010
Step 1
Where in a plant cell does photosynthesis take place?
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Answer
Photosynthesis takes place in the chloroplasts of a plant cell.
Step 2
Give the alternative name of the first stage of photosynthesis.
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Answer
The alternative name of the first stage of photosynthesis is 'Light Stage' or 'Light Reactions'.
Step 3
Where do the energised electrons come from?
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Answer
The energised electrons come from chlorophyll molecules, specifically from the absorption of light energy.
Step 4
Briefly describe the main events of each of these pathways.
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Answer
In the first pathway, the energised electrons are taken up by NADP+, leading to the formation of NADPH, and ATP is also produced by photophosphorylation.
In the second pathway, electrons are derived from water molecules, which are split (photolysis) to release oxygen, while also replenishing chlorophyll.
Step 5
What name is given to this group of compounds?
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Answer
The compounds formed are referred to as 'Carbohydrates'.
Step 6
From which simple compound does the plant obtain the H used to make compounds of general formula Cn(H2O)n?
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Answer
The plant obtains the hydrogen (H) from water (H2O).
Step 7
Name the simple compound that supplies the necessary energy for the second stage reactions.
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Answer
The simple compound that supplies the necessary energy for the second stage reactions is Adenosine Triphosphate (ATP).
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