Give information as asked about the following mineral nutrients in plants:
a. Iron:
i. it is a constituent of-, ii. it's one typical deficiency symptom.
b. Zinc:
i. the group of enzymes it activates,
ii. it is needed for the synthesis of -.
c. Phosphorus:
i. the form in which it is absorbed from the soil,
ii. its deficiency effect on seed germination.