Vitamin essential for formation of collagen is

Vitamin-P is essential for

Vitamin-K is essential for:

Double fertilization is essential for formation of

Double fertilization is essential for formation of

Is iron essential for the formation of chlorophyll pigment ?

Is iron essential for the formation of chlorophyll pigment ?

Complete the blanks. ................ (1) is very essential for the synthesis of nucleic acids .............. (2) vitamin is required for the formation of collagen.