Gladiolus flower called

Select the set in which the numbers are related in the same way as are the numbers of the following sets.

Select the option that is related to the third term in the same way as the second term is related to the first term.

Human body : Medicines : : Plants : ?

Select the option that is related to the third term in the same way as the second term is related to the first term.

Select the number from among the given options that can replace the question mark (?) in the following series.

17, 25, 34, 44, 55, ?

If 'A' stands for '÷ ', 'B' stands for '×', 'C' stands for + and 'D' stands for '–', what will come in place of the question

‘Z @ A’ means ‘Z is the son of A’.

‘Z * A’ means ‘Z is the brother of A’.

'Z × A’ means ‘Z is the father of A’.

Three of the following four letter-clusters are alike in a certain way and one is different.

Pick the odd one out. 

If the given sheet is folded to form a cube, which of the given figures is/are possible?

(The numbers are shown to indicate the sides only.)