Verbal Reasoning - Mental Ability Questions

In a family, there are six members A, B, C, D, E and F. 

A and B are a married couple, A being the male member. D is the only son of C, who is the brother of A. E is the sister of D. B is the daughter-in-law of F, whose husband has died. How is F related to C ? 

Select the related word/letters/number from the given alternatives.

Land of the Rising Sun : Japan : : The Land of the Thunder Dragon : ?

Select the related word/letters/number from the given alternatives.

PHOTOGRAPHER : CAMERA : : WRITER : ?

Select the related word/letters/number from the given alternatives.

FUNGI: MYCOLOGY:: TISSUE: ??

Select the related letters from the given alternatives.

GIK : PRT :: DFH : ?

Select the related word/letters/number from the given alternatives.

37 : 21 : : 29 : ?

Select the related word/letters/numbers from the given alternatives:

Cytology : Cells :: ? : Birds

Select the related word/letters/numbers from the given alternatives:

ACEG:BDFH::IKMO: ?