A day receiving more than ..............mm rainfall is called as 'crop rainy day'.

Correct option is B

· Correct answer: (b) 5.0
· A 'crop rainy day' is defined as a day when rainfall exceeds 5.0 mm. This amount is considered significant for crops.
Other options:
· (a) 2.5 mm: This is too low for a crop rainy day definition.
· (c) 7.5 mm: This value is typically considered high but not the exact threshold.
· (d) 10.0 mm: While substantial, it's usually considered too high for this term.