Question
What are the function of essential elements. Mention the role and deficiency symptom of Nitrogen, Phosphorus and Sulphur?
Answer :
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Skip in 10
- Functions of essential elements- The following points highlight the eleven important functions of essential elements of plants.
Function # 1. Constituents of Biomolecules:
Carbon and hydrogen are components of all organic substances. Many of them also contain oxygen. Nitrogen is a constituent of all amino acids, proteins, nucleic acid, chlorophyll, auxin, cytokinins and vitamins. Sulphur occurs in two amino acids— methionine and cysteine. They form a number of proteins.
Phosphorus is present in nucleotides, higher nucleotides (e.g., ADP, ATP, CDP, and CTP), coenzymes like NAD+ and NADP+, RNA, DNA and phospholipids. Fe is found in cytochromes. Mg is a component of chlorophyll. Ca and Mg produce spectates of middle lamella.
Depending upon the organic compound formed, mineral elements are of two types:
(a) Frame-work Elements:
They produce cell walls and storage products of plants, i.e., С, H, O.
(b) Protoplasmic Elements:
The elements produce protoplasmic constituents like proteins, nucleic acids, chlorophylls, cytochromes, ferredoxin, i.e., С, H, O, N, S, P, Mg, Fe.
Function # 2. Energy Related Compounds:
Magnesium is
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