IIT JEE Mains Advanced Materials

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🛑Major Role of Nutrients Various elements perform the following major role in the plants: (1) Construction of the plant body: The elements particularly C, H and O construct the plant body by entering into the constitution of cell wall and protoplasm. They are, therefore, referred to as frame work elements. Besides, these (C, H and O) N, P and S also enter in the constitution of protoplasm. They are described as protoplasmic elements. (2) Maintenance of osmotic pressure: Various minerals present in the cell sap in organic or inorganic form maintain the osmotic pressure of the cell. (3) Maintenance of permeability of cytomembranes: The minerals, particularly Ca++, K+ and Na+ maintain the permeability of cytomembranes. (4) Influence the pH of the cell sap: Different cations and anions influence on the pH of the cell sap. (5) Catalysis of biochemical reaction: Several elements particularly Fe, Ca, Mg, Mn, Zn, Cu, Cl act as metallic catalyst in biochemical reactions. (6) Toxic effects: Minerals like Cu, As, etc. impart toxic effect on the protoplasm under specific conditions. (7) Balancing function: Some minerals or their salts act against the harmful effect of the other nutrients, thus balancing each other. 🔔Specific Role of Macronutrients The role of different elements is described below: (1) Carbon, hydrogen and oxygen: These three elements though cannot be categorized as mineral elements, are indispensible for plant growth. These are also called 'framework elements'. (2) Nitrogen: Nitrogen is an essential constituent of proteins, nucleic acids, vitamins and many other organic molecules as chlorophyll. Nitrogen is also present in various hormones, coenzymes and ATP etc. (i) Deficiency symptoms: The symptoms of nitrogen deficiency are as follows: (a) Impaired growth (b) Yellowing of leaves due to loss of chlorophyll, i.e., chlorosis. (c) Development of anthocyanin pigmentation in veins, sometimes in petioles and stems. (d) Delayed or complete suppression of flowering and fruiting. (3) Phosphorus: Phosphorous is present abundantly in the growing and storage organs such as fruits and seeds. It promotes healthy root growth and fruit ripening by helping translocation of carbohydrates. (i) Deficiency symptoms (a) Leaves become dark green or purplish. (b) Sometimes development of anthocyanin pigmentation occurs in veins which may become necrotic (Necrosis is defined as localised death of cells). (c) Premature fall of leaves. (4) Sulphur Functions: Sulphur is a constituent of amino-acids like cystine, cysteine and methionine; vitamins like biotin and thiamine, and coenzyme A. Deficiency symptoms a) Leaf tips and margins roll downwards and inwards e.g., tobacco, tea and tomato. b) Premature leaf fall. c) Delayed flowering and fruiting. (5) Potassium Functions (a) It differs from all other macronutrients in not being a constituent of any metabolically important compound. (b) It is the only monovalent cation essential for the plants. (c) It acts as an activator of several enzymes including DNA polymerase. Deficiency symptoms (a) Mottled chlorosis followed by the development of necrotic areas at the tips and margins of the leaves. (b) K+ deficiency inhibits proteins synthesis and photosynthesis. At the same time, it increases the rate of respiration. (c) The internodes become shorter and root system is adversely affected. (6) Calcium Functions (a) It is necessary for formation of middle lamella of plants where it occurs as calcium pectate. (b) It is necessary for the growth of apical meristem and root hair formation. (c) It acts as activator of several enzymes, e.g., ATPase, succinic dehydrogenase, adenylate kinase, etc. Deficiency symptoms (a) Ultimate death of meristems which are found in shoot, leaf and root tips. (b) Chlorosis along the margins of young leaves, later on they become necrotic. (c) Distortion in leaf shape.

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