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NCERT Solutions Class 11 Biology Chapter 12 - Respiration in Plants
NCERT Solutions for Class 11 Biology Chapter 12 (Respiration in Plants) explain how plants break down food to release energy for growth, repair, and other life processes. The chapter covers the main stages of respiration, including glycolysis, the Krebs cycle (TCA cycle), and the Electron Transport System (ETS), which take place in the cytoplasm and mitochondria.
NCERT Solutions for Class 11 Biology Chapter 12 by ALLEN explain important topics such as the breakdown of glucose, ATP production, respiratory substrates, and the Respiratory Quotient (RQ). Students can also learn about the amphibolic pathway and understand how respiration supports plant growth and other activities. These solutions help students understand NCERT topics and prepare for school exams and NEET.
1.0Class 11 Biology Chapter 12 Respiration in Plants: Key Concepts
- Respiration in Plants: Understand how plants exchange gases through stomata, lenticels, and other plant parts without having a specialised respiratory system.
- Glycolysis (EMP Pathway): Learn how glucose is broken down into pyruvic acid through a series of reactions in the cytoplasm.
- Fermentation: Understand anaerobic respiration in yeast and other cells, leading to the formation of ethanol and carbon dioxide or lactic acid.
- Aerobic Respiration: Learn how pyruvate is further broken down in the mitochondria in the presence of oxygen to release energy.
- TCA Cycle (Krebs Cycle): Understand the cycle in the mitochondrial matrix that produces carbon dioxide, NADH, FADH₂, and ATP/GTP.
- Electron Transport System and Oxidative Phosphorylation: Learn how electrons from NADH and FADH₂ help create a proton gradient that drives ATP formation.
- Respiratory Balance Sheet: Understand the energy yield from the complete oxidation of one glucose molecule and how ATP is produced at different stages of respiration.
- Amphibolic Pathway: Learn why respiration is called an amphibolic pathway because it is involved in both the breakdown and formation of different compounds.
- Respiratory Quotient (RQ): Understand how RQ is calculated and how its value varies for carbohydrates, fats, and proteins used as respiratory substrates.
2.0Detailed NCERT Textbook Solutions : Class 11 Biology Chapter 12
- Differentiate between
(a) Respiration and Combustion (b) Glycolysis and Krebs' cycle (c) Aerobic respiration and Fermentation
Ans.
(a) Differences between respiration and combustion are as follows :
(b) Differences between glycolysis and Krebs' cycle are as follows:
(c) Differences between aerobic respiration and fermentation are as follows :
- What are respiratory substrates? Name the most common respiratory substrate. Ans. Respiratory substrates are those organic substances which are oxidised during respiration to liberate energy inside the living cells. The common respiratory substrates are carbohydrates, proteins, fats and organic acids. The most common respiratory substrate is glucose. It is a hexose monosaccharide.
- Give the schematic representation of glycolysis.
Ans.
- What are the main steps in aerobic respiration? Where does it take place? Ans. Aerobic respiration is an enzymatically controlled release of energy in a stepwise catabolic process of complete oxidation of organic food into carbon dioxide and water with oxygen acting as terminal oxidant. Common pathway is known so because its first step, called glycolysis, is common to both aerobic and anaerobic modes of respiration. The common pathway of aerobic respiration consists of three steps - glycolysis, Krebs' cycle and terminal oxidation. Aerobic respiration takes place within mitochondria. The final product of glycolysis, pyruvate is transported from the cytoplasm into the mitochondria.
- Give the schematic representation of an overall view of Krebs' cycle. Ans.
- Explain ETS. Ans. An electron transport chain or system (ETS) is a series of coenzymes and cytochromes that take part in the passage of electrons from a chemical to its ultimate acceptor. Reduced coenzymes participate in electron transport chain. Electron transport takes place on cristae of mitochondria [oxysomes ( , particles) found on the inner surface of the membrane of mitochondria]. NADH formed in glycolysis and citric acid cycle are oxidised by NADH dehydrogenase (complex I) and the electrons are transferred to ubiquinone. Ubiquinone also receives reducing equivalents via through the activity of succinate dehydrogenase (complex II). The reduced ubiquinone is then oxidised by transfer of electrons of cytochrome c via cytochrome bc1, complex (complex III). Cytochrome c acts as a mobile carrier between complex III and complex IV. Complex IV refers to cytochrome c oxidase complex containing cytochromes a and and two copper centres. When the electrons are shunted over the carriers via complex I to IV in the electron transport chain, they are coupled to ATP synthetase (complex V) for the formation of ATP from ADP and Pi. Oxygen functions as the terminal acceptor of electrons and is reduced to water along with the hydrogen atoms. Reduced coenzymes (coenzyme I, II and FAD) do not combine directly with the molecular . Only their hydrogen or electrons are transferred through various substances and finally reach . The substances useful for the transfer of electron are called electron carriers. Only electrons are transferred through cytochromes (Cyt Cyt , ) and finally reach molecular . Both cytochrome a and form a system called cytochrome bc 1 complex. Copper is also present in Cyt in addition to iron. The molecular oxygen that has accepted electrons now receives the protons that were liberated into the surrounding medium to give rise to a molecule of water. The liberated energy is utilised for the synthesis of ATP from ADP and Pi.
- Distinguish between the following: (a) Aerobic respiration and Anaerobic respiration (b) Glycolysis and Fermentation (c) Glycolysis and Citric acid cycle
Ans.
(b)Differences between glycolysis and fermentation are as follows :
- What are the assumptions made during the calculation of net gain of ATP? Ans. It is possible to make calculations of the net gain of ATP for every glucose molecule oxidised; but in reality this can remain only a theoretical exercise. These calculations can be made only on certain assumptions that:
- There is a sequential, orderly pathway functioning, with one substrate forming the next and with glycolysis, TCA cycle and ETS pathway following one after another transferred into the mitochondria and undergoes oxidative phosphorylation.
- None of the intermediates in the pathway are utilised to synthesise any other compound.
- Only glucose is being respired - no other alternative substrates are entering in the pathway at any of the intermediary stages. But these kind of assumptions are not really valid in a living system; all pathway work simultaneously and do not take place one after another; substrates enter the pathways and are withdrawn from it as and when necessary; ATP is utilised as and when needed; enzymatic rates are controlled by multiple means. Hence, there can be a net gain of 38 ATP molecules during aerobic respiration of one molecule of glucose.
- Discuss "The respiratory pathway is an amphibolic pathway". Ans. Amphibolic pathway is the one which is used for both breakdown (catabolism) and build-up (anabolism) reactions. Respiratory pathway is mainly a catabolic process which serves to run the living system by providing energy. The pathway produces a number of intermediates. Many of them are raw materials for building up both primary and secondary metabolites. Acetyl CoA is helpful not only in Krebs' cycle but is also raw material for synthesis of fatty acids, steroids, terpenes, aromatic compounds and carotenoids, a-ketoglutarate is organic acid which forms glutamate (an important amino acid) on amination. OAA (Oxaloacetic acid) on amination produces asparate. Both aspartate and glutamate are components of proteins. Pyrimidines and alkaloids are other products. Succinyl CoA forms cytochromes and chlorophyll.
Hence, fatty acids would be broken down to acetyl CoA before entering the respiratory pathway when it is used as a substrate. But when the organism needs to synthesise fatty acids, acetyl CoA would be withdrawn from the respiratory pathway for it. Hence, the respiratory pathway comes into the picture both during breakdown and synthesis of fatty acids. Similarly, during breakdown and synthesis of proteins too, respiratory intermediates form the link. Breaking down processes within the living organism is catabolism, and synthesis is anabolism. Because the respiratory pathway is involved in both anabolism and catabolism, it would hence be better to consider the respiratory pathway as an amphibolic pathway rather than as a catabolic one.
- Define RQ. What is its value for fats? Ans. Respiratory quotient (RQ) is the ratio of the volume of carbon dioxide produced to the volume of oxygen consumed in respiration over a period of time. Its value can be one, zero, more than 1 or less than one.
Volume of evolved Volume of consumed RQ is less than one when the respiratory substrate is either fat or protein.
RQ is about 0.7 for most of the common fats.
- What is oxidative phosphorylation? Ans. Oxidative phosphorylation is the synthesis of energy rich ATP molecules with the help of energy liberated during oxidation of reduced co-enzymes (NADH, ) produced in respiration. The enzyme required for this synthesis is called ATP synthase. It is considered to be the fifth complex of electron transport chain. ATP synthase is located in head piece of or elementary particles. The particles are present in the inner mitochondrial membrane. ATP synthase becomes active in ATP formation only where there is a proton gradient having higher concentration of or protons on the side as compared to F x side (chemiosmotic hypothesis of Peter Mitchell). Increased proton concentration is produced in the outer chamber or outer surface of inner mitochondrial membrane by the pushing of proton with the help of energy liberated by passage of electrons from one carrier to another. Transport of the electrons from NADH over ETC helps in pushing three pairs of protons to the outer chamber while two pairs of protons are sent outwardly during electron flow from . The flow of protons through the channel induces particle to function as ATP-synthase. The energy of the proton gradient is used in attaching a phosphate radical to ADP by high energy bond. This produces ATP. Oxidation of one molecule of produces 3 ATP molecules while a similar oxidation of forms 2 ATP molecules.
- What is the significance of step-wise release of energy in respiration? Ans. The utility of step-wise release of energy in respiration are given as follows : (i) There is a step-wise release of chemical bond energy which is very easily trapped in forming ATP molecules. (ii) Cellular temperature is not allowed to rise. (iii) Wastage of energy is reduced. (iv) There are several intermediates which can be used in production of a number of biochemicals. (v) Through their metabolic intermediates different substances can undergo respiratory catabolism. (vi) Each step of respiration is controlled by its own enzyme. The activity of different enzymes can be enhanced or inhibited by specific compounds. This helps in controlling the rate of respiration and the amount of energy liberated by it.
3.0NCERT Class 11 Biology – Chapter-Wise Solutions & Explanations
Explore NCERT Solutions for Class 11 Biology for all chapters with simple answers to every textbook question. Learn important concepts, revise key topics, and strengthen your Biology basics for exams.
4.0Key Features of NCERT Solutions for Class 11 Biology Chapter 12
- Step-by-Step Pathway Explanation: Clear explanation of the different stages of respiration, including where CO₂ is released and where ATP, NADH, and FADH₂ are produced.
- Respiratory Balance Sheet: Easy breakdown of ATP production at different stages of respiration and the overall energy yield from one glucose molecule.
- Oxidative Phosphorylation: Simple explanation of how the electron transport system and proton gradient help in ATP formation inside mitochondria.
- Respiratory Quotient (RQ): Clear explanation of RQ values and how they help identify whether carbohydrates, fats, or proteins are being used as respiratory substrates.
- Prepared by Expert Faculty: Prepared by ALLEN subject experts with explanations based on the concepts and pathways covered in NCERT Class 11 Biology Chapter 12.
- Amphibolic Pathway: Explanation of how carbohydrates, fats, and proteins can enter different stages of the respiratory pathway and why respiration is called an amphibolic pathway.
- Complete NCERT Exercise Coverage: Solutions to all NCERT exercise questions with clear explanations to help students understand respiration in plants.