question_answer 10)

Which metal ion is a constituent of chlorophyll? (a) Iron                                 (b) Copper                          (c) Magnesium                  (d) Zinc

Answer:

                (c) Magnesium (Mg) is present in the centre of porphyrin ring of the chlorophyll molecule. Other ions, i.e., iron, copper and zinc participate in other metabolic processes which are Fe is an important part of cytochrome and ferridoxin. Cu plays an important role in enzyme catalysing redox reactions. Zn is associated with auxin (a phytohormone) synthesis.