RBSE Class 11 Biology Notes Chapter 14 Respiration in Plants

These comprehensive RBSE Class 11 Biology Notes Chapter 14 Respiration in Plants will give a brief overview of all the concepts.

Rajasthan Board RBSE Solutions for Class 11 Biology in Hindi Medium & English Medium are part of RBSE Solutions for Class 11. Students can also read RBSE Class 11 Biology Important Questions for exam preparation. Students can also go through RBSE Class 11 Biology Notes to understand and remember the concepts easily.

RBSE Class 11 Biology Chapter 14 Notes Respiration in Plants

→ Energy is required for completion of different metabolic process in each organism.

→ In plants, energy is stored in the form of organic substances which are synthesized by photosynthesis, sis The energy is released by the oxidation of these organic substances.

→ In plants, anabolic and catabolic process continuously goes on, which are synthetical and destructive respectively and these are collectively called metabolic process

→ The respiration is a Characteristic feature in each organism. In this O2 is absorbed and CO2 is evolved. The respiration in plants is differ from that of in animals:

  • Plants do not breath,
  • Respiration can take place in the absence of O2 in some prokaryotes but CO2 does not evolve in this,
  • During day, there is no necessity of O2 from atmosphere is some plants. The O2 produced during photosynthesis is used in respiration by animals and COevolved in animal’s respiration is used in photosynthesis,

RBSE Class 11 Biology Notes Chapter 14 Respiration in Plants 

→ The respiration is an oxidation process, occurs in living cells, in which various complex organic substances (such as: glucose , starch, sugar, fats, proteins, organic acid etc.) oxidizing to form energy, which is used in various metabolic processes and stored in ATP. In this process CO2 is released

→ The combustion is also a oxidation process. In this also energy is released from organic substances but it is a chemical process which does not require living cell.

→ When in plants, there is no need of exchange of CO2 and O2 from atmosphere and that fulfils in plant, then this condition is called compensation point

→ The respiration process is of two types:

  • Aerobic respiration and
  • Anaerobic respiration

→ When respiration takes place in the presence of oxygen, it is called aerobic respiration and such organisms are called aerobic organisms. In this process CO2, water and large amount of energy are formed by complete oxidation of food materials.
C6H12O6 + 6O2 → 6CO2 + 6H2O + energy

→ When respiration takes place in the absence of O2 is called anaerobic respiration and the organisms are called anaerobic organisms. In this ethyl alcohol, or other organic acids, CO2 and less energy are formed by incomplete oxidation of food materials.
C6H12O6 →  2C2H5OH + 2CO2 + energy

→ Fermentation is a type of anaerobic respiration but it occurs outside the cell of organism by chemical reactions.

→ In respiration, generally, carbohydrate is respiratory substance. Aerobic .and anaerobic respiration takes place in two steps. The first step of both the process is same. It does not require O2. The two steps of respiration are glycolysis and Kreb’s cycle.

→ Glycolysis process takes place in cytoplasm. In this one molecule of glucose forms two molecules of pyruvic acid through various chemical reactions

→ When pyruvic acid formed in glycolysis oxidises in the absence of O2 to forms ethyl alcohol and CO2, then this process is called anaerobic respiration.
→ When the oxidation of pyruvic acid takes place in the presence of O2, CO2 and water are formed, then it is called aerobic respiration. It is also called Kreb’s cycle.

→ Before entering into Kreb’s cycle, pyruvic acid converts into acetyl Co-A. Thus acetyl Co-A is mediator of glycolysis and Kreb’s cycle.

→ Kreb’s cycle is also called tricarboxylic acid cycle (TCA) and occurs in mitochondrion.

RBSE Class 11 Biology Notes Chapter 14 Respiration in Plants

→ Respiration: Oxidation process of food materials.

→ Combustion: It is also an oxidation process but it differs from respiration.

→ Anabolism: The process in which new substances are synthesized.

→ Catabolism: The process in which complex substances are degraded.

→ Metabolism: Anabolism and catabolism are collectively called metabolism.

→ Glycolysis: A series of reactions taking place in cytoplasm in which pyruvic acid is formed from glucose.

→ Respiratory chain enzymes: Enzymes that are found in F1 particle of mitochondria and takes part in electron transport.

→ Aerobes: Organisms that survive in the presence of oxygen.

→ Anaerobes: Organisms that cannot survive in the presence of oxygen only.

RBSE Class 11 Biology Notes Chapter 14 Respiration in Plants

→ Fermentation: The respiration process takes place in the absence of oxygen in some micro-organisms.

→ Respiratory Quotient (RQ): The ratio of volume of evolved CO2 and volume of absorbed O2.

→ Respirometer: A device used in measurement of RQ.

Last Updated on July 8, 2022, 10:41 a.m.
Published July 8, 2022