Class 11 Biology - BIHAR
Respiration in Plants
The chapter 'Respiration in Plants' explores how plants break down food materials to release energy necessary for vital life processes. For Class 11 Bihar Board (BSEB) students, understanding this topic is crucial as it connects photosynthesis with energy utilization. You will learn about cellular respiration, glycolysis, the Krebs cycle, the electron transport system, and the amphibolic nature of pathways. This chapter consistently features in board examinations through direct theoretical questions, pathway diagrams, and numerical problems related to ATP yield, making it a high-scoring area for diligent students.
Start Learning FreeKey Concepts
Glycolysis
The first phase of cellular respiration taking place 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 series of enzyme-catalyzed chemical reactions occurring in the mitochondrial matrix that oxidizes acetyl-CoA completely into carbon dioxide, producing NADH, FADH2, and ATP.
Electron Transport System (ETS)
A sequence of electron carriers located in the inner mitochondrial membrane that transfers electrons from NADH and FADH2 to oxygen, driving oxidative phosphorylation to synthesize large amounts of ATP.
Respiratory Quotient (RQ)
The ratio of the volume of carbon dioxide evolved to the volume of oxygen consumed during respiration, which helps determine the type of respiratory substrate being used.
Fermentation
An anaerobic pathway where pyruvic acid is converted into ethanol and carbon dioxide (in yeast) or lactic acid (in muscles/bacteria) without the involvement of oxygen.
Important Formulas
Board Exam Info
In the Bihar School Examination Board (BSEB) Class 11 Biology exams, this chapter typically carries around 4 to 6 marks. Questions frequently appear as short-answer types explaining pathways like glycolysis or the Krebs cycle, very short-answer questions defining RQ, and occasionally long-answer questions detailing the entire aerobic respiration process along with diagrammatic representations of cycles.
Frequently Asked Questions
What is the difference between breathing and cellular respiration?
Breathing is a physical process of inhaling oxygen and exhaling carbon dioxide, whereas cellular respiration is a biochemical process inside cells that breaks down glucose to release energy in the form of ATP.
Why is the Krebs cycle also called the TCA cycle?
It is called the Tricarboxylic Acid (TCA) cycle because the first stable intermediate product formed is citric acid, which contains three carboxylic acid groups.
What is the Respiratory Quotient (RQ) for carbohydrates?
The RQ for carbohydrates is 1.0 because equal volumes of carbon dioxide are evolved and oxygen is consumed during their oxidation.
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