Class 11 Biology - TELANGANA
Respiration in Plants
The chapter 'Respiration in Plants' explores how plants break down complex organic compounds, especially glucose, through cellular respiration to release energy in the form of ATP. Students will study both aerobic respiration—covering glycolysis, the Krebs cycle, and the electron transport system—and anaerobic respiration, including fermentation. Understanding respiratory substrates, the amphibolic nature of pathways, and the respiratory quotient (RQ) is essential. For Telangana (TSBSE) Class 11 board exams, this chapter is a major scoring area, frequently featuring conceptual questions on cycles, diagram-based questions on the electron transport chain, and numerical problems related to ATP yield and respiratory quotient.
Start Learning FreeKey Concepts
Glycolysis
The first phase of respiration that takes place in the cytoplasm, where glucose is partially broken down into two molecules of pyruvic acid without requiring oxygen.
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 coenzymes and cytochromes located in the inner mitochondrial membrane that transfer electrons, driving oxidative phosphorylation to synthesize ATP.
Fermentation
An anaerobic pathway in yeast and bacteria where pyruvic acid is converted into ethanol and carbon dioxide, or lactic acid in animal tissues, yielding very little energy.
Respiratory Quotient (RQ)
The ratio of the volume of CO2 evolved to the volume of O2 consumed in respiration, which helps determine the type of respiratory substrate being used.
Important Formulas
Board Exam Info
In the Telangana (TSBSE) Class 11 Biology exams, Respiration in Plants typically carries around 6 to 8 marks. Questions frequently include Very Short Answer Questions (VSAQs) like defining RQ or naming the site of glycolysis, Short Answer Questions (SAQs) on differences between aerobic and anaerobic respiration or glycolysis steps, and occasionally Long Answer Questions (LAQs) detailing the Krebs cycle or Electron Transport System.
Frequently Asked Questions
Why is glycolysis called the EMP pathway?
It is named after the three German scientists who discovered it: Gustav Embden, Otto Meyerhof, and J. Parnas.
What is the net gain of ATP during glycolysis?
Though 4 ATP molecules are produced, 2 ATP are consumed during the initial steps, resulting in a net gain of 2 ATP molecules.
Why is the respiratory pathway considered amphibolic?
Because it acts as both a catabolic pathway (breaking down glucose for energy) and an anabolic pathway (providing precursors for the synthesis of fatty acids, amino acids, etc.).
Learn Respiration in Plants with Your AI Tutor
10 different ways to study this chapter. Free for 3 chapters per day.
Lecture
Key Points
Interactive
Quiz
Flashcards