A magnesium deficiency would impact the light-independent reactions but not the light-dependent reaction of photosynthesis.
Answer the following statement true (T) or false (F)
False
Clarify Question
• What is the key concept addressed by the question?
o The question is asking about the specifics of the importance of magnesium in photosynthesis.
• What type of thinking is required?
o You are being asked to take what you already know and apply it to a magnesium deficiency during the stages of photosynthesis.
• What key words does the question containand what do they mean?
o Magnesium, which is a macronutrient that is a component of chlorophyll.
o Light-dependent reactions, which capture sunlight and convert it into stored energy.
o Light-independent reactions, which used stored energy to fix CO2 into glucose.
Gather Content
• What do you already know about the importance of magnesium in photosynthesis? How does it relate to the question?
o Chlorophyll is a pigment that captures the majority of light energy that is used in photosynthesis.
o Magnesium is a necessary component of chlorophyll.
o In the light-dependent reactions, chlorophyll captures light and stores the energy as ATP and NADPH.
o In the light-independent reactions, the stored energy is used to fix CO2 into glucose.
Consider Possibilities
• What other information is related to the question? Which information is most useful?
o Without magnesium, chlorophyll cannot be synthesized. Without chlorophyll, the light-dependent reactions and consequently the light-independent reactions will not occur.
Choose Answer
• Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
o To answer this question, you need to see the direction relationship between the presence of magnesium, the presence of chlorophyll, and the reactions of photosynthesis. If magnesium is removed, chlorophyll cannot be synthesized and photosynthesis cannot occur.
Reflect on Process
• Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
• Apply level:
o This question asked you to predict what would happen to the reactions of photosynthesis if magnesium is not present. Answering this question correctly depended on your ability to use the role of magnesium in a new situation. If you got the correct answer, great job! If you got an incorrect answer, where did the process break down? Did you remember that magnesium is required for chlorophyll structure, or that chlorophyll drives the light-dependent and in turn the light-independent reactions? Did you have trouble extending the function of magnesium to determine the correct answer?
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