Class 11 Biology - HARYANA
Respiration in Plants
The chapter 'Respiration in Plants' explores how plants break down food materials to release energy necessary for life processes. As a crucial unit in Class 11 Biology, it details cellular respiration, contrasting it with photosynthesis. Students will learn about both anaerobic and aerobic respiration, including glycolysis, the Krebs cycle, and the electron transport system. For Haryana (BSEH) board exams, this chapter is a primary source of analytical questions, cycle diagrams, and numerical calculations related to ATP yield. Mastering these pathways is essential for scoring high marks in botany.
Start Learning FreeKey Concepts
Glycolysis
The first phase of 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 takes place in the mitochondrial matrix where acetyl-CoA is completely oxidized to carbon dioxide, releasing NADH and FADH2.
Electron Transport System (ETS)
A series of co-enzymes and cytochromes located in the inner mitochondrial membrane that transfers electrons, driving oxidative phosphorylation to produce ATP.
Fermentation
An anaerobic pathway where pyruvic acid is converted into ethanol and carbon dioxide or lactic acid, yielding only a small amount of ATP.
Respiratory Quotient (RQ)
The ratio of the volume of CO2 evolved to the volume of O2 consumed during cellular respiration, varying depending on the respiratory substrate.
Important Formulas
Board Exam Info
In Haryana (BSEH) Class 11 Biology exams, this chapter typically carries around 4 to 6 marks. Questions frequently include short-answer definitions, diagrammatic representations of the Krebs cycle or glycolysis, and numerical problems calculating the net ATP gain from a glucose molecule.
Frequently Asked Questions
Where does glycolysis take place in the cell?
Glycolysis occurs 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 traditionally calculated, though recent models estimate around 30-32 ATP due to shuttle mechanisms.
Why is the Krebs cycle also called the citric acid cycle?
Because the first stable product formed in this cyclic pathway is citric acid (a 6-carbon compound).
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