Which of the following pairs (Plant nutrient - Function) is not correctly matched?

Which one of the following is NOT a function of the pigment carotenoid?

Which one of the following elements is essential for the formation of chlorophyll in green plants?

Which of the following the chlorophyll in photosynthesis is used for?

Xylem in plants is responsible for following function:

Deficiency of which of the following elements causes yellowing and poor growth of the plants?