Explain the processes that take place in the stroma including the reactants going in and the products produced from these processes in (a) bright sunlight and in (b) darkness. (c) What happens over an extended period of darkness of many days?
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Does it have to do with the calvin cylce?
Ms. Sue?? Anyone?
a. In bright sunlight, the Calvin cycle occurs in the stroma. During the Calvin cycle, the products of the light-dependent reactions (ATP and NADPH) are used to convert molecules of CO2 into high-energy sugars.
b. In darkness, the Calvin cycle also occurs in the stroma. During the Calvin cycle, the products of the light-dependent reactions (ATP and NADPH) are used to convert molecules of CO2 into high-energy sugars. If the plant has been in the dark
I got a bad grade with that answer D:
Sure, I can help you with that! Let's start by understanding the processes that take place in the stroma of the chloroplast, the organelle responsible for photosynthesis in plant cells.
In the stroma, several important reactions occur, including the light-independent reactions, commonly known as the Calvin cycle. This process involves a series of biochemical reactions that convert carbon dioxide (CO2) into glucose, a sugar molecule that serves as a source of energy and building block for the plant.
Now, let's consider the different scenarios:
a) Bright sunlight: In the presence of bright sunlight, photosynthesis occurs at its optimal rate. The reactants for the Calvin cycle in bright sunlight are carbon dioxide (CO2) and ATP and NADPH (which are produced during the light-dependent reactions that happen earlier in the thylakoid membrane). The products of the Calvin cycle are glucose (C6H12O6) and ADP + Pi (inorganic phosphate), which are used to regenerate ATP.
b) Darkness: In the absence of sunlight, the light-dependent reactions cannot occur, and therefore there is no production of ATP and NADPH. As a result, the Calvin cycle in darkness cannot take place because it relies on the energy carriers (ATP and NADPH) produced during the light-dependent reactions. Consequently, the reactants (CO2) cannot be converted into glucose, and there are no products produced.
c) Extended period of darkness: If darkness persists for an extended period, the plant's stored ATP and NADPH reserves will gradually diminish. This depletion of energy carriers prevents the Calvin cycle from occurring. As a result, the plant will not be able to carry out photosynthesis efficiently, leading to a decrease in glucose production. Over many days of darkness, without the ability to replenish its energy reserves, the plant may experience a decline in growth and eventually face a lack of energy to sustain its metabolic processes.
In summary, the stroma plays a vital role in the light-independent reactions of photosynthesis. In bright sunlight, the stroma uses carbon dioxide, ATP, and NADPH to produce glucose through the Calvin cycle. In darkness, the absence of light-dependent reactions prevents the Calvin cycle from occurring and thus no reactants are converted into glucose. Extended periods of darkness lead to a depletion of energy reserves and a decrease in glucose production, eventually impacting the plant's growth and survival.
describe the activities that take place in bright sunlight and in darkness
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