A non biology person is quit shocked to know that apple is a false fruit , mango is a true fruit and banana is a seedless fruit. as a biology students how would you satisfy this person?

 ANSWER= 

       In apple only the thalamus (along with ovary) portion contributes to fruit. therefor, it is false fruit.  Mango develops only from ovary, therefore, it is true fruit. and Banana develops from ovary but without fertilisation . the method is known as parthenocarpy.

since, there is no fertilisation , no seeds are formed in banana.