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The correct answer is option 3, Rice. Rice is a tropical food crop that requires a temperature of 27°C and rainfall of more than 10 cm. Let`s analyze the other options to understand why they are not the correct answer.
Option 1, Wheat, is not a tropical food crop. It is a cool-season crop that thrives in temperate climates with mild summers and cool winters.
Option 2, Maize, also known as corn, can tolerate a wide range of temperatures and rainfall conditions. While it can grow in tropical regions, it does not have specific temperature and rainfall requirements like rice does.
Option 4, Barley, is another cool-season crop that prefers temperate climates. It has lower heat tolerance compared to rice.
Therefore, the correct tropical food crop that requires a temperature of 27°C and rainfall of more than 10 cm is rice.