Explanation

All except Watermelon grow on trees

Explanation

The organisms living in a jungle are artificially reared in a zoo.

Similarly,

the organisms living in the sea are artificially reared in an aquarium.

Explanation

Pesticide is used to protect plant from disease.

Similarly,

vaccination is used to protect body from any disease.

Explanation

All except potato are fruits, while wheat is a crop

Explanation

The job of a pilot is to navigate (a ship or plane);

similarly:

the job of an oarsman is to propel (that is, to power) a boat.

Explanation

The analogy is based on the relationship between a word and its associated connotation or meaning:

Redoubtable : Awe (redoubtable inspires awe or fear)

Venerable : Renown (venerable commands respect and renown)

Explanation

The analogy is:

Grapes : Wine :: Wheat : Bread

Just as grapes are used to make wine, wheat is used to make bread.

Explanation

Headquarters of SAARC located in Khatmandu, Nepal while headquarters of INTERPOL located in Lyon, France. 

Explanation

G + 1 = H

O + 0 = O

L + 1 = M

D + 1 = E 

GOLD =  HOME 

S + 1 = T

O + 0 = O

N + 1 = O

S + 1 = T 

SONS =  TOOT

Explanation

Someone who is dilatory makes a habit of delay; someone who is menacing frequently offers threats.