The following graph shows how the rate of photosynthesis varied when a plant was subjected to varying levels of light intensity or carbon dioxide concentration - Leaving Cert Biology - Question 4 - 2005
Question 4
The following graph shows how the rate of photosynthesis varied when a plant was subjected to varying levels of light intensity or carbon dioxide concentration.
(a)... show full transcript
Worked Solution & Example Answer:The following graph shows how the rate of photosynthesis varied when a plant was subjected to varying levels of light intensity or carbon dioxide concentration - Leaving Cert Biology - Question 4 - 2005
Step 1
What is happening at A?
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Answer
At point A, the rate of photosynthesis is increasing as the light intensity or carbon dioxide concentration increases. This indicates that the plant is utilizing the available resources more efficiently, resulting in a higher rate of photosynthesis.
Step 2
What is happening at B?
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At point B, the rate of photosynthesis is leveling off. This suggests that the plant has reached a saturation point where increasing light intensity or carbon dioxide concentration no longer leads to an increase in the rate of photosynthesis.
Step 3
Suggest a reason for your answer in (b)
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The reason for the leveling off at point B could be that the light intensity or carbon dioxide is saturated, meaning that the plant's photosynthesis mechanism has reached its maximum capacity under the given conditions.
Step 4
Where in a cell does photosynthesis take place?
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Photosynthesis takes place in the chloroplasts of plant cells, where the processes of converting light energy into chemical energy occur.
Step 5
Give two sources of the carbon dioxide that is found in the atmosphere.
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(i) Respiration from living organisms which release carbon dioxide as a byproduct.
(ii) Combustion of fossil fuels which releases carbon dioxide into the atmosphere.
Step 6
Suggest one way in which the rate of photosynthesis of plants in a greenhouse could be increased.
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One way to increase the rate of photosynthesis in a greenhouse is to provide increased artificial lighting or to increase the carbon dioxide levels in the environment, which would enhance the photosynthetic process.
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