Class 11 Biology - RAJASTHAN
Respiration in Plants
The chapter Respiration in Plants explores how green plants break down complex organic compounds like glucose to release energy essential for cellular activities. For Class 11 Rajasthan (RBSE) students, this chapter is crucial as it details cellular respiration, including glycolysis, the Krebs cycle, and the electron transport system (ETS). You will learn about both aerobic and anaerobic respiration, the significance of the respiratory quotient (RQ), and how ATP acts as the energy currency of the cell. Mastering these metabolic pathways is vital for scoring high in board exams and understanding plant physiology deeply.
Start Learning FreeKey Concepts
Glycolysis
The first phase of cellular respiration that occurs in the cytoplasm, breaking down one molecule of glucose into two molecules of pyruvic acid with a net gain of 2 ATP.
Krebs Cycle
Also known as the citric acid cycle, it occurs in the mitochondrial matrix where acetyl-CoA is completely oxidized to carbon dioxide, releasing NADH, FADH2, and ATP.
Electron Transport System (ETS)
A series of co-enzymes and cytochromes located in the inner mitochondrial membrane that transfer electrons to oxygen, driving oxidative phosphorylation to produce ATP.
Fermentation
An anaerobic pathway where pyruvic acid is converted into ethanol and carbon dioxide or lactic acid, yielding very little energy compared to aerobic respiration.
Respiratory Quotient (RQ)
The ratio of the volume of CO2 evolved to the volume of O2 consumed during respiration, which varies depending on the respiratory substrate used.
Important Formulas
Board Exam Info
This chapter typically carries around 4 to 6 marks in the Rajasthan (RBSE) Class 11 Biology annual examination. Common question types include short-answer questions on the site of glycolysis or Krebs cycle, differentiation between aerobic and anaerobic respiration, and numerical or conceptual questions based on Respiratory Quotient (RQ).
Frequently Asked Questions
Where does glycolysis take place inside the plant cell?
Glycolysis takes place in the cytoplasm of the cell and does not require oxygen.
What is the net gain of ATP in aerobic respiration from one glucose molecule?
The net gain is typically 36 to 38 ATP molecules, depending on the shuttle system used for reducing equivalents.
Why is the respiratory quotient for fats less than 1?
Because fats consume more oxygen for their oxidation than the volume of carbon dioxide they produce.
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