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Question
Answer the following question.
Why are plants that consume more than the usual 18 ATP to produce 1 molecule of glucose favoured in tropical regions?
Solution
- C4 plants are favoured in tropical regions as they require 30 ATP to produce 1 molecule of glucose.
- The high temperature in tropical regions leads to closure of stomata to reduce the rate of transpiration. Due to this availability of CO2 decreases.
- PEP carboxylase present in mesophyll cells can fix CO2 even at low concentration. This helps the plant inefficient assimilation of atmospheric carbon dioxide.
- C4 plants contain special leaf anatomy called Kranz anatomy which minimizes the losses due to photorespiration.
- It helps C4 plants to survive in conditions of high daytime temperatures, intense sunlight and low moisture.
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