Select the mismatch.

1. Frankia                      Alnus

2. Rhodospirillium            Mycorrhiza

3. Anabaena                   Nitrogen fixer

4. Rhizobium                 Alfa-fa

In which of the following, all three are macronutrients?
(1) Iron, copper, molybdenum

(2) Molybdenum, magnesium, manganese

(3) Nitrogen, magnesium, phosphorus

(4) Boron, zinc, manganese

Which is essential for the growth of root tip?
1. Zn

2. Fe

3. Ca

4. Mn