Hard fruit of citrus is caused by deficiency of

A. N

B. B

C. Ca

D. Mo

Answer: Option B

Solution(By Examveda Team)

The deficiency of Boron in citrus fruit causes hard fruit or stone fruit. A lack of boron results in gum pockets forming in the fruit albedo and flesh, near the rind.
Fruit is small and hard with gum-like spots on the skin.