NCERT Solution for Class 11 Biology Chapter 14 RESPIRATION IN PLANTS

Welcome to Swastik Classes! In this comprehensive NCERT Solution series, we present to you the detailed solutions for Class 11 Biology Chapter 14: “Respiration in Plants.” This chapter explores the fascinating world of plant respiration, which is essential for their survival and energy production.

In this chapter, we delve into the various aspects of respiration in plants, including the different pathways, the role of mitochondria, and the factors affecting plant respiration. Understanding these concepts is crucial for comprehending how plants obtain energy from organic compounds and carry out their metabolic activities.

Our team of experienced educators has meticulously analyzed and broken down each concept, ensuring clarity and simplicity in explanations. These solutions are designed to help you grasp the intricate details of plant respiration, enabling you to confidently tackle any question related to this topic.

By using our NCERT solutions, you will not only enhance your conceptual understanding but also develop problem-solving skills to excel in examinations. Our solutions include insightful explanations, diagrams, and examples, allowing you to connect theoretical knowledge with real-life applications. This approach nurtures a holistic understanding of plant respiration and its significance in plant growth and survival.

At Swastik Classes, we are committed to providing you with the best educational resources. Our NCERT Solution series for Class 11 Biology Chapter 14: “Respiration in Plants” is a valuable tool to help you navigate through the complexities of this chapter. We believe that a solid foundation in plant biology will enable you to appreciate the remarkable processes that drive plant respiration.

Embark on this learning journey with us, and let’s unravel the wonders of respiration in plants together!

NCERT Solution for Class 11 Biology Chapter 14 RESPIRATION IN PLANTS – Exercises

1. Give the schematic representation of an overall view of Krebs’ cycle.


2. Differentiate between
(a) Respiration and Combustion
(b) Glycolysis and Krebs’cycle
(c) Aerobic respiration and Fermentation
Sol. (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:

3. What are respiratory substrates? Name the most common respiratory substrate.
Sol. 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.

4. Give the schematic representation of glycolysis.

5. Explain ETS.
Sol. 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 ( F0 -F1 , 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 FADH2 through the activity of succinate dehydrogenase (complex II). The reduced ubiquinone is then oxidised by transfer of electrons of cytochrome c via cytochrome Fc, 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  a3and 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 O2. Only their hydrogen or electrons are transferred through various substances and finally reach O2. The substances useful for the transfer of electron are called electron carriers. Only electrons are transferred through cytochromes (Cyt F1 Cyt c,,C2, a,  a3) and finally reach molecular O2. Both cytochrome a and a3 form a system called cytochrome oxidase. Copper is also present in Cyt  a3 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.

6. What are the main steps in aerobic respiration? Where does it take place?
Sol. 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. It
occurs by two methods, common pathway and pentose phosphate pathway. 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.

7. What are the assumptions made during the calculation of net gain of ATP?
Sol. 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 36 ATP molecules during aerobic respiration of one molecule of glucose.

8. Distinguish between the following:
(a) Aerobic respiration and Anaerobic respira¬tion.
(b) Glycolysis and Fermentation.
(c) Glycolysis and Citric acid cycle.
Sol. (a) Differences between aerobic and anaerobic respiration are as follows:
(b) Differences between glycolysis and fermentation are as follows:

9. Discuss The respiratory pathway is an amphibolic pathway”.
Sol. 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.

10. Define RQ. What is its value for fats?
Sol. 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 C02 evolved Volume of 02 consumed
RQ is less than one when the respiratory substrate is either fat or protein.
C57 H104O6 + 80 O2-» 57 CO2+ 52H2O
RQ = 57CO2/80O2 = 0.71
RQ is about 0.7 for most of the common fats.

11. What is oxidative phosphorylation?
Sol. Oxidative phosphorylation is the synthesis of energy rich ATP molecules with the help of energy liberated during oxidation of reduced co-enzymes (NADH, FADH2) 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 FT or head piece of F0 -F1 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 H+ or protons on the F0 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 FADH2. The flow of protons through the F0 channel induces F1 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 NADH2 produces 3 ATP molecules while a similar oxidation of FADH2 forms 2 ATP molecules.

12. What is the significance of step-wise release of energy in respiration?
Sol. 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.

Conclusions for NCERT Solution for Class 11 Biology Chapter 14 RESPIRATION IN PLANTS

the NCERT Solution series for Class 11 Biology Chapter 14: “Respiration in Plants” by Swastik Classes provides comprehensive and insightful solutions to help you understand the intricate processes involved in plant respiration.

Throughout this chapter, we have explored various aspects of plant respiration, including the different pathways, the role of mitochondria, and the factors affecting plant respiration. By delving into these concepts, we gain a deeper understanding of how plants obtain energy from organic compounds and carry out their metabolic activities.

Our solutions are meticulously crafted to simplify complex concepts, ensuring clarity and ease of understanding. The explanations, diagrams, and examples provided in our solutions enable you to connect theoretical knowledge with practical applications, fostering a holistic approach to learning.

By using our NCERT solutions, you will not only enhance your conceptual understanding but also develop problem-solving skills to excel in examinations. We believe that a strong foundation in plant respiration is essential for comprehending the fundamental processes that drive plant growth and survival.

At Swastik Classes, we are committed to providing you with the best educational resources. Our NCERT Solution series for Class 11 Biology Chapter 14: “Respiration in Plants” is designed to support your learning journey and help you succeed academically.

We hope that our solutions have equipped you with the necessary tools to confidently tackle any question related to this chapter. By mastering the concepts covered in this chapter, you will have a solid understanding of the processes that drive plant respiration and the vital role it plays in plant growth and survival.

Thank you for choosing Swastik Classes as your trusted learning companion. We wish you success in your biology studies and encourage you to explore the fascinating world of plant respiration further!

  1. Q: What is respiration in plants, and why is it essential? A: Respiration in plants is the process through which plants convert stored energy in organic compounds into usable forms, such as ATP. It involves the breakdown of glucose in the presence of oxygen, releasing energy, carbon dioxide, and water. Respiration is essential for plant growth, as it provides the energy needed for metabolic activities, nutrient uptake, and synthesis of new molecules.
  2. Q: How does respiration in plants differ from respiration in animals? A: Respiration in plants and animals share the same overall process of converting glucose into energy. However, there are some differences. Plants primarily respire aerobically, but they can also respire anaerobically under certain conditions. Animals, on the other hand, rely mostly on aerobic respiration. Additionally, plants have specialized structures called mitochondria that carry out respiration, while animals have specialized respiratory organs like lungs.
  3. Q: What are the different pathways of respiration in plants? A: Plants can undergo aerobic respiration, which occurs in the presence of oxygen, and anaerobic respiration, which occurs in the absence of oxygen. Aerobic respiration takes place in the mitochondria and involves the Krebs cycle and the electron transport chain. Anaerobic respiration in plants can occur through processes like alcoholic fermentation or lactic acid fermentation.
  4. Q: What factors can affect the rate of respiration in plants? A: Several factors can influence the rate of respiration in plants. Temperature plays a crucial role, as respiration rates increase with higher temperatures. Oxygen availability, light intensity, and the availability of carbohydrates also impact respiration rates. Additionally, the age and physiological state of the plant can influence the rate of respiration.
  5. Q: How do plants respire in the absence of light during the night? A: During the night, when there is no light for photosynthesis, plants rely on stored carbohydrates for energy through respiration. In the absence of light, plants switch to aerobic respiration, breaking down stored sugars to release energy. This process allows plants to continue metabolic activities, growth, and maintenance even in the absence of photosynthesis.
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