Students can go through AP Inter 2nd Year Botany Notes 5th Lesson Respiration in Plants will help students in revising the entire concepts quickly.
AP Inter 2nd Year Botany Notes 5th Lesson Respiration in Plants
→ All the energy required for life processes is obtained by oxidation of some macromolecules that we call food.
→ Only green plants and cyanobacteria can prepare their own food by the process of photosynthesis.
→ The mechanism of breakdown of food materials with in the cell to release energy and the trapping of this energy for synthesis of ATP.
→ The compounds that are oxidised during this process are known as respiratory substrates.
→ ATP acts as the energy currency of the cell.
→ Respiration is of two types a) aerobic b) an aerobic
→ Aerobic respiration occurs in the presence of O2 in four steps.
→ Glucose is brokendown into 2 pyruvic acid molecules is called glycolysis or EMP pathway.
→ The complete oxidation of pyruvate by the step wise removal of all the hydrogen atoms, leaving 3 CO2 molecules.
→ Pyruvate undergoes oxidative decarboxylation in the presence of pyruvic dehydrogenase then condenses with CoA to yield acetyl Co A.
→ Acetyl CoA undergoes complete oxidation and releases energy rich NADPH+H+ molecules through Krebs cycle.
→ NADPH+H+ or FADH2 molecules oxidise and release electrons which move through ETS pathway finally reach 1/2 O2 along with protons to form H2O.
→ ATP synthesis can be explained by peter Mitchell, chemiosmotic hypothesis.
→ 1 Glucose on oxidises produce 36 ATP molecules.
→ In respiration both catabolism and anabolism are visible, so called amphibolic pathway.
→ The ratio of the volume of CO2 evolved to the volume of O2 consumed in respiration is called respiratory quotient.
→ Respiratory quotient of carbohydrates is one.
→ Respiratory quotient of fats is less than one (0.7).
→ Respiratory quotient of proteins is less than one (0.9).