Class 11 Biology - ODISHA
Respiration in Plants
The chapter 'Respiration in Plants' in Class 11 Biology explores how plants break down complex organic compounds, primarily glucose, to release energy in the form of ATP for various cellular activities. You will learn about cellular respiration, starting from glycolysis in the cytoplasm to the Krebs cycle and oxidative phosphorylation in the mitochondria. The chapter covers both aerobic and anaerobic respiration, the electron transport system, and the amphibolic nature of the respiratory pathway. For the Odisha BSE board exams, understanding these metabolic pathways and energy yield calculations is crucial for scoring high marks in both short and long answer questions.
Start Learning FreeKey Concepts
Glycolysis
The first phase of respiration that occurs in the cytoplasm, where one molecule of glucose is partially broken down into two molecules of pyruvic acid, yielding a net gain of 2 ATP and 2 NADH.
Krebs Cycle (TCA Cycle)
A cyclic series of reactions taking place in the mitochondrial matrix where acetyl-CoA is completely oxidized to carbon dioxide, producing NADH, FADH2, and substrate-level ATP.
Electron Transport System (ETS)
A series of co-enzymes and cytochromes located on the inner mitochondrial membrane that transfer electrons, creating a proton gradient used to synthesize ATP via oxidative phosphorylation.
Aerobic vs Anaerobic Respiration
Aerobic respiration requires oxygen and completely oxidizes glucose to CO2 and H2O, whereas anaerobic respiration (fermentation) occurs in the absence of oxygen, producing incomplete breakdown products like ethanol or lactic acid.
Respiratory Quotient (RQ)
The ratio of the volume of carbon dioxide evolved to the volume of oxygen consumed in respiration, which helps determine the type of respiratory substrate being used.
Important Formulas
Board Exam Info
In the Odisha (BSE) Class 11 Biology examinations, this chapter typically carries around 4 to 6 marks. Expect 1-mark objective questions, 2-mark short notes on pathways like glycolysis or fermentation, and 3 to 5-mark long questions requiring a schematic diagram or detailed explanation of the Krebs cycle or Electron Transport System.
Frequently Asked Questions
Where does glycolysis take place in a plant cell?
Glycolysis takes place in the cytoplasm of the cell and does not require oxygen.
What is the net gain of ATP from one glucose molecule during aerobic respiration?
A net gain of 38 ATP molecules is theoretically produced, though actual yield can vary around 30-32 ATP depending on shuttle mechanisms.
Why is the respiratory pathway called an amphibolic pathway?
Because it acts as both catabolic (breakdown of glucose to release energy) and anabolic (using pathway intermediates to synthesize fatty acids, amino acids, etc.) processes.
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