In plants, the option that shows the range of environmental temperature and CO2 to O2 ratio which favours photorespiration is:
Correct answer: C. High, Low
- A. Low, Low
- B. Low, High
- C. High, Low
- D. High, High
Explanation
Photorespiration is a process in plants where the enzyme RuBisCO oxygenates RuBP, leading to a decrease in photosynthetic output. This process is most active at high temperatures and when the CO2 to O2 ratio is low, as RuBisCO has a higher affinity for oxygen under these conditions. Therefore, option C is correct as it describes a high temperature with a low CO2 to O2 ratio, both of which promote photorespiration.
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About Plant Nutrition and Transport
Plants require macronutrients and micronutrients for growth, and mineral deficiencies produce recognizable symptoms. Transport involves water and minerals through xylem by transpiration pull, cohesion and adhesion, while phloem translocates sugars from sources to sinks. Root pressure and transpiration are distinct mechanisms.
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