Question: asking about the maturity index or signs of water melon
Answer: told him that fully matured water melon will take  90 to 120 days after planting ,)
(a) withering of tendril: the tendril accompanying the fruit withers as fruit ripeness.
b) thumping: ripe fruits when thumped with finger give out heavy dull sound, whereas the immature fruits give metallic sound. 
c) the portion of fruit, which rests on the ground, turned yellowing at maturity. 
d) ripe fruits produce a crisp, cracking noise on being pressed with the flat of the hand.