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Which of the given is/are not favourable...

Which of the given is/are not favourable factors(s) for cyclic photophosphorylation?
a. Low light intensity
b. Poor `CO_2` avallability
c. Aerobic condition

A

a and b

B

a and c

C

b and c

D

Only c

Text Solution

AI Generated Solution

The correct Answer is:
To determine which of the given options are not favorable factors for cyclic photophosphorylation, we will analyze each option step by step. ### Step 1: Understand Cyclic Photophosphorylation Cyclic photophosphorylation is a process that occurs in the light-dependent reactions of photosynthesis, primarily in plants. It involves the flow of electrons in a cycle, starting from Photosystem I (P700) and returning to it after passing through an electron transport chain. This process generates ATP but does not produce NADPH or oxygen. ### Step 2: Analyze Option A - Low Light Intensity Low light intensity can limit the amount of energy available for photosynthesis. However, cyclic photophosphorylation can still occur under low light conditions, albeit at a reduced rate. Therefore, low light intensity is not considered a favorable factor for optimal cyclic photophosphorylation. ### Step 3: Analyze Option B - Poor CO2 Availability Cyclic photophosphorylation can occur even when carbon dioxide (CO2) availability is low. In fact, lower CO2 levels can favor cyclic photophosphorylation as it allows for the recycling of electrons within the system without the need for carbon fixation. Thus, poor CO2 availability is not a favorable factor for this process. ### Step 4: Analyze Option C - Aerobic Condition Cyclic photophosphorylation is more favorable under anaerobic conditions. In aerobic conditions, the presence of oxygen can lead to the production of reactive oxygen species, which can inhibit the process. Therefore, aerobic conditions are not favorable for cyclic photophosphorylation. ### Conclusion Based on the analysis: - **Option A (Low light intensity)**: Not favorable - **Option B (Poor CO2 availability)**: Not favorable - **Option C (Aerobic condition)**: Not favorable The correct answer is **Option C** as it is the most unfavorable factor for cyclic photophosphorylation. ### Final Answer: **C. Aerobic condition** is not a favorable factor for cyclic photophosphorylation. ---
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