Answer:
Essential elements are
involved in performing variety of functions in plants. Some of the major
functions are enlisted below
(i)Frame work
elements Essential elements as components of biomolecules and hence are
structural elements of the cell. Carbon, hydrogen and oxygen are considered as framework
elements because they constitute carbohydrates which form cell wall.
(ii) Protoplasmic
elements N, P and S are considered as protoplasmic elements as they form
protoplasm along with C, H and oxygen.
(iii) Catalytic
enzyme Essential elements that activates or inhibit enzymes, i.e., without the presence
of these elements some enzymes can not function e.g., acts as an activator
for both ribulose biphosphate carboxylase oxygenase (Rubisco) and phosphoenol
pyruvate carboxylase (PEP carboxylase).
Both are the
critical enzymes involved in photosynthetic carbon fixation in plants.
(iv) Balancing
elements Elements counteract the toxic effect of other minerals by causing ionic
balance (e.g., calcium, magnesium and potassium).
(v) Influencing
on the osmotic pressure of the cell Some essential elements alters the osmotic
potential of the cell. Plant cells contain dissolved mineral elements in the
cell sap influencing osmotic pressure of the cell, e.g., K is involved in
opening and closing of stomata.
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