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BIOLOGICAL CLASSIFICATION 🚥2 kingdom classification - Carlous Linnanous 🚥5 kingdom classification - RH whittaker (1969) 🚥 Bacteria are of two types 1)archaebacteria (old) 2) eubacteria (true) 🚥Mycoplasma doesnt posses cell wall smallest living cells can survive without oxygen 🚥Chrysophytes (includes diatoms nd golden algae) walls are made of silica. These are chies producers in ocean 🚥 Dinoflagellates (cell wall has stiff cellulose plates) have two flagella one longituuone transverse. (Red tides) 🚥Euglenoids (protein rich layer k/as pellicle) 🚥Slime moulds in suitable condition form aggregation k/as plasmodium nd during unfavorable condition it forms fruty bodies 🚥Protozoans (primitive relative of animals) 🚥 Kingdom fungi Fungi are filamentous contain thread like structure called hyphae mass of hypahe called mycelium 🚥 Meiosis in zygote result in haploid spores 🚥Phycomytes Mycelium is aseptate nd coenocytic asexual rep takes place by zoospores(motile) nd aplanospores(non motile) 🚥Ascomytes (sac fungi) Mycelium us branch nd septate asexual spores sre conidia nd sexual spores are ascospores 🚥Basidiomycetes (bracket fungi) Asexual spores absent nd vegetative rep by fragmentation 🚥Deuteromycetes (imperfect fungi) rep only by asexual spores called conidia 🚥 Kingdom plantae Life cycle of plants has two phase 1) diploid sporophytic 2)haploid gametophytic 🚥Kingdom animalia Heterotypic multicellular eukaryotic org that lacks cell wall 🚥 Viruses (non cellular org) these are obligate parasites mostly virus have single strand rna protein coat called capsid protects nucleic acid 🚥 Viroids (rna of Viroid is low molecular weight) 🚥Prions (similar to virus has abnormal protein) 🚥Lichens symbotic ass bw algae nd fungi algal comp called phycobiont nd fungal component called mycobiont 🚥mycorrhiza  fungi in association with algae as lichens with roots of higher plants 🎖Click Here To Join Best Channel 🎖

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All Physics Handpicked Short Notes 📚⌛ 1. Unit and dimension 📝 2. Motion1d📝 3. Motion2D📝 4.Laws of Motion📝 5.WEP📝 6.CircularMotion   📝 7.System of particles 📝 8.RotationalMotion 📝 9.Gravitation📝 10.Solids and Fluids📝 11.Thermal Properties of matter  📝 12.KTG&Thermodynamics📝 13.SHM 📝 14.Waves 📝 15.Electrostatics📝 16.Capacitor 📝 17.Current Electricity 📝 18.Moving charges and Magnetism 📝 19.Magnetism📝 20.EMI and AC📝 21.Ray optics 📝 22.Wave Optics 📝 23.Dual Nature/Atom /Nuclie 📝 24.Semiconductor 📝 Do Revise From these Notes.📒📖

♻️ Important Scientific Laws and Theories ♻️ ============================== 🔹 Ohm's Law - It states that the current passing through a conductor between two points is directly proportional to the potential difference across the two points provided the physical state and temperature etc. of the conductor does not change. 🔹 Pauli exclusion principle - It explains that no two electrons in the same atom or molecule can have the same set of quantum numbers. 🔹 Raman effect - It is the change in wavelength that occurs when light is scattered by the atoms or molecules in a transparent medium. 🔹 Tyndall effect - The scattering of light by very small particles suspended in a gas or liquid. 🔹 Boyles's Law - It states that temperature remaining constant, volume of a given mass of a gas varies inversely with the pressure of the gas. Thus, PV = K (constant), where, P = Pressure and V = Volume. 🔹 Charles's Law - It states that pressure remaining constant, the volume of a given mass of gas increases or decreases by 1/273 part of its volume at 0 degree celsius for each degree celsius rise or fall of its temperature. 🔹 Coulomb's Law - It states that force of attraction or repulsion between two charges is proportional to the amount of charge on both charges and inversely proportional to the square of the distance between them. 🔹 Heisenberg principle (uncertainty principle) - It is impossible to determine with accuracy both the position and the momentum of a particle such as electron simultaneously. 🔹 Archimede's principle - It states that a body when wholly or partially immersed in a liquid, experiences an upward thrust which is equal to the weight of the liquid displaced by it. Thus, the body appears to lose a part of its weight. This loss in weight is equal to the weight of the liquid displaced by the body. 🔹 Aufbau principle - It states that in an unexcited atom, electrons reside in the lowest energy orbitals available to them. 🔹 Avogadro's Law - It states that equal volumes of all gases under similar conditions of temperature and pressure contain equal number of molecules. 🔹 Brownian motion - It is a zigzag, irregular motion exhibited by small solid particles when suspended in a liquid or gas due to irregular bombardment by the liquid or gas molecules. 🔹 Bernoulli's principle - It states that as the speed of a moving fluid, liquid or gas, increases, the pressure within the fluid decreases. The aerodynamic lift on the wing of an aeroplane is also explained in part by this principle. 🔹 Gay-Lussac’s Law of combining volumes - Gases react together in volumes which bear simple whole number ratios to one another and also to the volumes of the products, if gaseous — all the volumes being measured under similar conditions of temperature and pressure. 🔹 Graham’s Law of Diffusion - It states that the rates of diffusion of gases are inversely proportional to the square roots of their densities under similar conditions of temperature and pressure. 🔹 Kepler's Law - Each planet revolves round the Sun in an elliptical orbit with the Sun at one focus. The straight line joining the Sun and the planet sweeps out equal areas in equal intervals. The squares of the orbital periods of planets are proportional to the cubes of their mean distance from the Sun. 🔹 Law of Floatation - For a body to float, the following conditions must be fulfilled: The weight of the body should be equal to the weight of the water displaced and the centre of gravity of the body and that of the liquid displaced should be in the same straight line. 🔹 Law of conservation of energy - It states that energy can neither be created nor destroyed but it can be transformed from one form to another. Since energy cannot be created or destroyed, the amount of energy present in the universe is always remain constant. 🔹 Newton's First Law of Motion - An object at rest tends to stay at rest, and an object in motion tends to stay in motion, with the same direction and speed in a straight line unless acted upon by some external force. 🎖Click Here To Join Our Main Channel🎖

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♻️ Important Notes - Electrochemical Cells ♻️ ► An electrochemical cell can convert electrical energy to chemical energy and can also convert electrical energy to chemical energy. There are two types of electrochemical cells- Galvanic cell and Electrolytic cell. ► Cathodes are usually metal electrodes. It is the electrode where reduction takes place. The cathode is the positive electrode in a galvanic cell and a negative electrode in an electrolytic cell. Electrons move into the cathode. ► A half-cell is half of an electrochemical cell (electrolytic or galvanic), where either oxidation or reduction occurs. At equilibrium, there is no transfer of electrons across the half cells. Therefore, the potential difference between them is nil. ► A salt bridge is a device used to connect the oxidation and reduction half-cells of a galvanic cell (a type of electrochemical cell). Strong electrolytes are generally used to make the salt bridges in electrochemical cells. Since ZnSO4 is not a strong electrolyte, it is not used to make salt bridges. ► Emf of a cell is equal to the maximum potential difference across its electrodes, which occurs when no current is drawn through the cell. It can also be defined as the net voltage between the oxidation and reduction half-reactions. ► Cell potential is an intensive property as it is independent of the amount of material present. Gibbs free energy is defined for an electrochemical cell and is an extensive property as it depends on the quantity of the material. ► Electrode potential is the tendency of an electrode to accept or to lose electrons. Electrode potential depends on the nature of the electrode, temperature of the solution and the concentration of metal ions in the solution. It doesn’t depend on the size of the electrode. ► The salt bridge connects the two half-cell solutions to complete the circuit of the electrochemical cell. The electrolytes of the salt bridge are generally prepared in agar-agar or gelatin so that the electrolytes are kept in a semi-solid phase and do not mix with the half-cell solutions and interfere with the electrochemical reaction. ► A salt bridge is a junction that connects the anodic and cathodic compartments in a cell or electrolytic solution. It maintains electrical neutrality within the internal circuit, preventing the cell from rapidly running its reaction to equilibrium. ► A Voltaic or Galvanic cell is a type of electrochemical cell that converts chemical energy into electrical energy. Photovoltaic cells are used to convert light energy into electrical energy. An Electrolytic cell is a type of electrochemical cell that converts electrical energy into chemical energy. A fuel cell is an electrochemical cell that converts the chemical energy of a fuel and an oxidizing agent into electricity. ► For all spontaneous chemical reactions, the change in Gibbs free energy (ΔG°) is always negative. For a spontaneous reaction in an electrolytic cell, the cell potential (E°cell) should be positive. ► In an electrochemical cell, when an opposing externally potential is applied and increased slowly, the reaction continues to take place. When the external potential is equal to the potential of the cell, the reaction stops. Once the externally applied potential is greater than the potential of the cell, the reaction goes in the opposite direction and the cell behaves like an electrolytic cell. ► Primary cells cannot be used again and again. Since there is no fluid inside, these cells are also known as dry cells. The internal resistance is high and the chemical reaction is irreversible. Their initial cost is cheap. ► A secondary battery (a series of cells) is one which can be charged, discharged into a load, and recharged many times. Nickel-cadmium cell, Lead storage cell and Mercury cell are examples of secondary cells. Leclanche cell is an example of a primary cell. 🎖Click Here To Join Our Main Channel 🎖

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Various forms and function of essential nutrients- Nitrogen- required by plants in greatest amount, it is absorbed by plants as NO2–, NO3– and NH4+ . It is one of the major constituent of proteins, nucleic acids and vitamins. Phosphorus- Absorbed by plants from soil in the form of phosphate ions. It is the constituent of cell membrane. All nucleic acids and nucleotides require phosphorus. Potassium – absorbed as potassium ions (K+). Help to maintain cation-anion balance in cells. It is involved in protein synthesis, opening and closing of stomata. Calcium – absorbed by plants from soil in form of Calcium ions (Ca2+). Used in synthesis of cell wall. It activates certain enzymes. Magnesium- absorbed by plants in form of Mg2+ ions. It activates the enzymes for respiration, photosynthesis, and involved in synthesis of DNA and RNA. It is constituent of chlorophyll. Sulphur- plants obtain sulphur in form of sulphate (SO42-). Present in amino acids (cysteine, methionine) and is main constituent of coenzymes and vitamins. Iron- obtained in the form of ferric iron (Fe3+). It is important constituent of protein involved in transport system. Manganese-absorbed in form of Mn2+ ions. Main function is splitting of water to liberate Hydrogen and Oxygen during photosynthesis. Zinc-obtained as Zn2+ ions. Activate enzymes like carboxylases. Needed in formation of Auxin. Copper –absorbed as cupric ions(Cu2+). Involved in various metabolic activities and redox reactions. Boron-absorbed as BO33- or B4O72- ions. Required for uptake of calcium, cell elongation and pollen germination. Chlorine – it is absorbed in form of Cl– ions. Determine the solute concentration and splitting of water during photosynthesis ➵ Click Here To Join Our Main Channel