Class 11 Biology - KARNATAKA
Respiration in Plants
The chapter 'Respiration in Plants' in Class 11 Biology explores how plants break down food materials to release energy necessary for life processes. Students will study cellular respiration, aerobic and anaerobic pathways, glycolysis, the Krebs cycle, the electron transport system, and the amphibolic nature of pathways. Understanding this chapter is crucial for Karnataka (KSEEB) board exams as it features frequently in both conceptual and diagram-based questions, carrying around 5 to 7 marks in the annual examinations.
Start Learning FreeKey Concepts
Glycolysis
The breakdown of glucose to pyruvic acid that takes place in the cytoplasm of the cell, common to both aerobic and anaerobic respiration.
Krebs Cycle
Also known as the citric acid cycle, it occurs in the mitochondrial matrix where acetyl-CoA is completely oxidized to carbon dioxide and water.
Electron Transport System (ETS)
A series of coenzymes and cytochromes located in the inner mitochondrial membrane that transfers electrons to oxygen, driving ATP synthesis.
Fermentation
An anaerobic pathway where pyruvic acid is converted into lactic acid or ethanol, releasing a minimal amount of energy.
Respiratory Quotient (RQ)
The ratio of the volume of CO2 evolved to the volume of O2 consumed in respiration, varying depending on the respiratory substrate used.
Important Formulas
Board Exam Info
In the Karnataka (KSEEB) Class 11 Biology paper, this chapter typically carries about 5 to 7 marks. Questions usually include 1-mark objective questions, 2 or 3-mark short answers on glycolysis or fermentation, and 5-mark descriptive questions explaining the Krebs cycle or the electron transport chain.
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 molecule of glucose during aerobic respiration?
A net gain of 38 ATP molecules is typically produced from one glucose molecule in aerobic respiration (though some shuttle systems yield 30-32 ATP).
Why is the respiratory pathway considered amphibolic?
It acts as both catabolic (breakdown of substrates like glucose) and anabolic (using pathway intermediates to synthesize fats and proteins), hence it is amphibolic.
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