Respiration:-Types of Respiration

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Respiration:-

Importance Mechanism of respiration. Glycolysis, Kreb’s cycle. Pentose phosphate pathway Storage of energy in the cell. Anaerobic respiration quotient compensation point.

All Living organisms require continuous supply of energy to carry on various biological processes such as uptake of substance, Growth, development and movement. This energy is obtained by the oxidation of complex organic compound. organisms break these complex organic substance into simple substance by a planned process of oxidation.

Main features of respiration:-

  1. Respiration is a vital process:- It occurs in all living organisms. It occurs throughout day and night (24 hours) at slow or high speed.
  2. Respiration is a biological oxidation process:- The oxidation of organic substance occurs at normal temperature in respiration. several enzymes take part in this process.
  3. Respiration is a catabolic process:- The breakdown of complex organic compound into simple substance occurs in respiration. The quantity of dry weight decrease in living tissues due to respiration.
  4. Energy is produced in respiration:- Respiration is an exergonic process energy is produced inside the cells.

Significance of respiration:-

  • Energy produced in thi process is utilized in various metabolic processes of plants.
  • The complex compound are converted into simple compound by this process.
  • Various chemical compound formed in this process are essential for cell components.
  • Carbon dioxide released in this process maintains the concentration of co2 in the atmosphere.
  • Various meristematic tissues become active by this process.

Respiration:-Types of Respiration

There are two types of respiration

  1. Aerobic Respiration

  2. Anaerobic Respiration

Aerobic Respiration –

Respiration occurring in the presence of oxygen is called aerobic respiration. In most of the plants, usually aerobic respiration is found. During aerobic respiration, the food substance are completely oxidixed into carbon dioxide and water and alongwith this large amount of energy is also released. The oxidation of one molecule of glucose produces nearly 673 Kcal of energy.

The Co2   produced in this process gets liberated into the atmosphere , water is retained inside the cells and the energy is utilized in various biological processes. The process of aerobic respiration can be represented by the following equestion-

C6H12o6 +6o2 → 6co2 +6H2o+Energy(673K.cal)

Anaerobic respiration –

Respiration occurring in the absence of oxygen is called anaerobic respiration. During anaerobic respiration, the food substance are incompletely oxidised resulting in the formation of Co2 and ethyl alcohol from one molecule of glucose. The energy released during this respiration is quite less in comparison to aerobic respiration. The incomplete oxidation of one molecule of glucose produces nearly 28 kcal of energy. The process of anaerobic respiration can be represented by the following reaction-

C6H12o6 +6o2 → 2C2H5OH +2co2 +Energy(28K.cal)

Difference between Aerobic and anaerobic respiration

Aerobic respiration Anaerobic respiration
1.       It occurs in the presence of oxygen. 1.       It occurs in the absence of oxygen.
2.Complete oxidation of organic substances takes places. 2.Incomplet oxidation of organic substance takes place.
3.The end products of this process are Co2 and H2o. 3.The end product of this process are Co2 and ethyl alcohol.
4.It is not toxic to plants. 4. It is toxic to higher plants.
5.It occurs in cytoplasm (Glycolysis) and mitochondria. 5. It occurs in cytoplasm only.
6. It occurs in all the living cells.
  • 6.It occurs only in some bacteria, fungi, germinating seeds etc.