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B4: Quiz 2 – Answers
B4: Quiz 2 – Answers
1) carbon dioxide + water –> glucose + oxygen
2)
a) Light intensity, concentration of carbon dioxide and temperature
b) A limiting factor is where the rate of photosynthesis will not increase unless the limiting factor is increased/ a limiting factor is limiting the rate of photosynthesis/ a limiting factor is stopping the rate of photosynthesis from increasing
3)
a)
2)
a) Light intensity, concentration of carbon dioxide and temperature
b) A limiting factor is where the rate of photosynthesis will not increase unless the limiting factor is increased/ a limiting factor is limiting the rate of photosynthesis/ a limiting factor is stopping the rate of photosynthesis from increasing
3)
a)
b) At the start
4)
a)
4)
a)
b) At the start
5)
a)
5)
a)
b) As the temperature increases, the photosynthesis reactants and enzymes have more kinetic energy and move around faster. This leads to more frequent collisions, thus resulting in more photosynthesis reactions and the rate of photosynthesis increasing
c) As the temperature goes past the optimum, the excessive temperature causes the bonds in the enzymes to break. This changes the shape of the active site for the enzymes, which means that the reactants can no longer fit into the enzyme’s active site, thus resulting in the rate of photosynthesis decreasing. This process is known as denaturing
6) If the plant does not make enough chlorophyll or chloroplasts, the plant cannot absorb enough sunlight, and therefore, cannot photosynthesise as well as a healthy plant without the disease. This will reduce the amount of glucose that the plant will be able to make, which will likely mean that the plant will have reduced/ stunted growth
c) As the temperature goes past the optimum, the excessive temperature causes the bonds in the enzymes to break. This changes the shape of the active site for the enzymes, which means that the reactants can no longer fit into the enzyme’s active site, thus resulting in the rate of photosynthesis decreasing. This process is known as denaturing
6) If the plant does not make enough chlorophyll or chloroplasts, the plant cannot absorb enough sunlight, and therefore, cannot photosynthesise as well as a healthy plant without the disease. This will reduce the amount of glucose that the plant will be able to make, which will likely mean that the plant will have reduced/ stunted growth
Questions
1) Write down the word equation for photosynthesis.
2)
a) What are the 3 main factors that affect the rate of photosynthesis?
b) What does a limiting factor mean?
3) We have the empty graph below with light intensity on the x axis and the rate of photosynthesis on the y axis.
1) Write down the word equation for photosynthesis.
2)
a) What are the 3 main factors that affect the rate of photosynthesis?
b) What does a limiting factor mean?
3) We have the empty graph below with light intensity on the x axis and the rate of photosynthesis on the y axis.
a) Draw a line on the graph showing how the rate of photosynthesis changes with light intensity.
b) Out of the start and the end, when is light intensity a limiting factor for photosynthesis?
4) We have the empty graph below with the concentration of carbon dioxide on the x axis and the rate of photosynthesis on the y axis.
b) Out of the start and the end, when is light intensity a limiting factor for photosynthesis?
4) We have the empty graph below with the concentration of carbon dioxide on the x axis and the rate of photosynthesis on the y axis.
a) Draw a line on the graph showing how the rate of photosynthesis changes with the concentration of carbon dioxide.
b) Out of the start and the end, when is the concentration of carbon dioxide a limiting factor for photosynthesis?
5) We have the empty graph below with temperature on the x axis and the rate of photosynthesis on the y axis.
b) Out of the start and the end, when is the concentration of carbon dioxide a limiting factor for photosynthesis?
5) We have the empty graph below with temperature on the x axis and the rate of photosynthesis on the y axis.
a) Draw a line on the graph showing how the rate of photosynthesis changes with temperature.
Try not to use the parts below in this question to help you answer the first part.
b) Explain why the rate of photosynthesis increases when the temperature increases from a very low temperature to the optimal temperature.
c) Explain why the rate of photosynthesis decreases when the temperature becomes greater than the optimal temperature.
6) A plant has a disease which results in it having fewer chloroplasts/ it is unable to produce enough chlorophyll. Comment on how the disease will affect the growth of the plant.
Try not to use the parts below in this question to help you answer the first part.
b) Explain why the rate of photosynthesis increases when the temperature increases from a very low temperature to the optimal temperature.
c) Explain why the rate of photosynthesis decreases when the temperature becomes greater than the optimal temperature.
6) A plant has a disease which results in it having fewer chloroplasts/ it is unable to produce enough chlorophyll. Comment on how the disease will affect the growth of the plant.