Answer the following questions from your knowledge of photosynthesis - Leaving Cert Biology - Question b - 2016
Question b
Answer the following questions from your knowledge of photosynthesis.
(i) Where in plant cells does the process take place?
(ii) Name a substance which absorbs lig... show full transcript
Worked Solution & Example Answer:Answer the following questions from your knowledge of photosynthesis - Leaving Cert Biology - Question b - 2016
Step 1
Where in plant cells does the process take place?
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Answer
Photosynthesis takes place in the chloroplasts of plant cells, where the light-sensitive reactions occur.
Step 2
Name a substance which absorbs light energy for the process.
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Answer
The substance responsible for absorbing light energy during photosynthesis is chlorophyll.
Step 3
In which pathway of the light stage is oxygen produced?
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Answer
Oxygen is produced in Pathway 2 of the light stage of photosynthesis.
Step 4
Outline how this oxygen is produced.
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Oxygen is produced through the process of photolysis, where water molecules are split using the light energy absorbed by chlorophyll. This reaction releases oxygen as a by-product.
Step 5
Give one fate of this oxygen.
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The oxygen produced can be released into the atmosphere or used in respiration by the plant.
Step 6
What is the fate of the carbon in the carbon dioxide used in the dark stage?
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The carbon from the carbon dioxide is converted into carbohydrates during the dark stage of photosynthesis.
Step 7
Give one reason why a suitable temperature is necessary for the dark stage to occur.
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A suitable temperature is necessary because the enzymes that facilitate the reactions in the dark stage are temperature-sensitive and require optimal conditions for efficient functioning.
Step 8
Aquatic plants such as Elodea are particularly suitable for investigating photosynthesis. Suggest a reason for this.
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Aquatic plants like Elodea produce bubbles of oxygen, which can be easily observed and counted, making them ideal for studying the rate of photosynthesis.
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