Maharashtra BoardEnglish MediumSTD 11 ScienceBiologyPhotosynthesis4 Marks
Question
Give reason. Why $C _4$ plants are favoured in tropical regions?
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Answer
1. $C_4$ plants are favoured in tropical regions as they require 30 ATP to produce 1 molecule of glucose. 2. High temperature in tropical regions leads to closure of stomata to reduce rate of transpiration. Due to this availability of $CO _2$ decreases. 3. PEP carboxylase present in mesophyll cells can fix $CO _2$ even at low concentration. This helps the plant in efficient assimilation of atmospheric carbon dioxide. 4. $C_4$ plants contain a special leaf anatomy called Kranz anatomy which minimizes the losses due to photorespiration. 5. It helps $C_4$ plants to survive in conditions of high daytime temperatures, intense sunlight and low moisture.
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