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A Handbook of Biology

MÅÑGÅÑËSË:

It is absorbed as

manganous ions

(Mn²⁺).

It activates many

enzymes involved

in photosynthesis,

respiration

and nitrogen

metabolism.

The best defined

function of

manganese is in the

splitting of water

(photolysis of water)

to liberate O2 during

photosynthesis.

(AIPMT 2012)

1

2

3

ZÏÑÇ:



Plants obtain zinc as ions Zn²⁺ ions.



It activates various enzymes, especially carboxylases. It is needed in the

synthesis of auxin.

ÇØPPËR:



It is absorbed as Cu²⁺ (Cupric) ions.



It is important for overall metabolism and involved with enzymes of

redox reaction.

BØRØÑ:

It is absorbed as or BO3

3- & B4O7

2-

1

2

It is required for uptake & utilisation of Ca²⁺, membrane

functioning, pollen germination, cell elongation, cell

differentiation & carbohydrate translocation.

3

Boron helps in translocation of sugar.

(AIPMT 2003)