micronutrient?
A: The essential elements present in planet tissues in large amounts
(i.e., more than 10 m mole / Kg-1 of dry matter) are called
macronutrients. Those present in plant tissues in very small amounts
(i.e. less than 10 m mole / Kg-1 of dry matter) are called
micronutrients or trace elements.
Q: Give two examples of essential elements that act as activators for enzymes.
A: Essential elements activate or inhibit enzymes. Some examples for
essential elements
that act as activators for enzymes are
1) Mg2+- Ribulose bisphosphate carboxylase - Oxygenase
2) Zn2+ - Alcohol dehydrogenase
3) Mn2+ - IAA oxidase
4) Mo - Nitrogenase
Q: Name the essential mineral elements that play an important role in
photolysis of water.
A: Calcium (macronutrient), Manganese and chlorine (micronutrients)
play essential role in photolysis (or splitting) of water during light
reaction leading to the evolution of Oxygen.
Q: Out of the 17 essential elements which elements are called
non-mineral essential elements? Name the amino acids in which Sulphur
is present.
A: Among the 17 essential elements Carbon, Hydrogen and Oxygen are
non- mineral macro essential elements. They are obsorbed from CO2 and
H2O. Methionine and cysteine (amino acids) contain Sulphur.
Q: When is an essential element said to be deficient?
A: The concentration of the essential element below which plant growth
in retarded is termed as critical concentration. An essential element
is said to be deficient when present below the critical concentration.
Q: Name two elements whose symptoms of deficiency first appear in
younger leaves.
A: Deficiency symptoms first appear in younger leaves whenever the
elements are relatively immobile. Ex: Sulphur and calcium.
Q: Explain the role of the pink colour pigment in the root nodule of
legume plants. What is it called?
A: Pink colour pigment in the root nodule of the legume plants in
called Leguminous haemoglobin or leg haemoglobin. It protects
nitrogenase from Oxygen as the enzyme is sensitive to Oxygen. Thus it
acts as Oxygen scavenger.
Q: Name the essential elements present in nitrogenase enzyme. What
type of essential elements are they?
A: The essential elements present in the nitrogenase enzyme are Fe and
Mo, Both are micro mineral elements.
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