Subjective And Short Questions For Respiration


  1. What is respiration? Give its evolution.
  2. Describe different steps of glycolysis.
  3. Describe different steps of Krebs cycle.
  4. Draw Kerbs cycle.
  5. Write note on electron transport chain.
  6. Write note on respiratory substrate.
  7. Write note on respiratory quotient.


  1. Define respiration.

Ans:      The series of oxidation reduction reactions in which substances (glucose) are oxidized to carbon dioxide and oxygen and energy is released is called respiration.

  1. Differentiate between aerobic and anaerobic respiration.

Ans:    Aerobic respiration: takes place in the presence of free oxygen.It includes .Krebs cycle and electron transport chain. Anaerobic respiration takes place in the absence of Tree oxygen. This process is called fermentation.

  1. Write name of enzymes involved in preparatory phase of glycolysis.

Ans:  Hexokinase, phosphofructokinase , aldolase.

  1. What is Krebs’s cycle? Who did 6 scover it?

Ans:      Krebs cycle is a series of reactions i. which the pyruyate from glycolysis is oxidized to CO, The K; bs cycle was discovered by Hans Krebs in the 1930s.

  1. When does substrate level phosphorylation occur during Krebs cyele?

Ans:    Substrate level phosphorylation occurs in this ‘step 5. CoA is replaced by a phosphate group and succinate is formed. The phosphate group is then transferred to GDP.

  1. What is electron transport chain?

.Ans:     The collection electron carrier molecules embedded in the inner membrane of the mitochondrion is called electron transport chain:

  1. What is oxidative phosphorylation?

Ans:    The Synthesis of ATP molecule in the presence of oxygen is called oxidative phosphorylation.

  1.   Define chemiosmosis.

Ans:    The coupling reaction in which synthesis of ATP molecule takes during movement of  H across an H                 gradient is called chemiosmosis



  1. What is Lactic acid fermentation?Ans: The NADH reduces the Pyruvate to form lactic acid. This reaction occurs in the mammalian muscles and certain fungi. The animal used NADH, to reduce the pyruvate. This reaction is controlled by an enzyme lactate dehydrogenase.
    1. What are Obligative anaerobic? Give example.

    Ans:    Obligatiye anaerobic organisms include certain types of bacteria. These organisms survive only in the complete absence of molecular oxygen. Its example is clostridium sp.

    1. What are Facultative anaerobic?

    Ans:    Facultative anaerobic organisms and tissues include certain bacteria, yeasts, and cells. These organisms can ferment nutrients in absence of oxygen. It also generates some ATP. It also provides NAD for glycolysis.

    1. What are respiratory substrates?

    Ans: The organic substances of the cells used up in the respiratory process are called respiratory substrate.

    1. What is respiratory quotient? Give its number of glucose.
  2. Ans: The ratio of the volume of carbon dioxide give out to the volume of oxygen absorbed (CO2702) is called the respiratory quotient



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  1. Arslan January 22, 2017

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