Respiration in Plants
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All organisms needs energy for their life activities. This energy is obtained by a process called respiration.
- Respiration. Is a catabolic process which involves the stepwise oxidation of glucose in a living cell to release energy.
- Respiration. It of two types (i) Aerobic and (ii) Anaerobic.
- Aerobic Respiration. Involves complete oxidation of glucose. This is represented by
C6 H12 O6+6CO2 → 6CO2+6H2O + Energy
- Anaerobic Respiration. Involves the incomplete breakdown of glucose. The products are ethyl alcohol and CO2.
C6 H12 O6 → 2C2H5OH + 2CO2+ 2ATP
The energy released in respiration is stored in ATP molecules.
- ATP. Acts as a common intermediate between energy producing and energy requiring process
- The step-wise breakdown of organic food is important as (i) it releases energy in steps which can be easily trapped (ii) no wastage of energy. (iii) there is minimum rise in temperature.
- Respiratory Substrate. It can be catalysed to release energy. The most common respiratory substance is glucose.
- Aerobic respiration takes place in two steps:
- Glycolysis and Kreb’s cycle.
- Glycolysis. occurs in cytoplasm. The first stable product of glycolysis is pyruvic acid.
- Kreb’s Cycle. Occurs in mitochondria. Mitochondria. Mitochondria is considered as the power house of the cell.
- Fermentation. It is a type of anaerobic respiration in which ethyl alcohol and CO2 are formed by micro organisms or their enzymes.
- The energy released in respiration is used in many life activities.
- Respiration is opposite of photosynthesis in many ways. The heat energy produced is used for optimum temperature for proper functioning of the body.
Distinguish between the following pairs:
- Respiration and combustion.
- Aerobic and anaerobic respiration.
- Fermentation and anaerobic respiration.
- Glycolysis and Kreb’s scycle.
- Respiration and photosynthesis.
|1.||(i) It takes place in living cells(ii) It is a slow process.
(iii) Break down of organic matter is controlled by enzymes.
(iv) Less heat is produced.
|(i) It takes place in dead and non-living things.(ii) It is a fast process.(iii) It is a chemical process. Enzymes are not needed.
(iv) More heat is produced.
|2.||Aerobic respiration||Anaerobic respiration|
|(i) It takes place in the presence of oxygen.(ii) It involves the complete breakdown of glucose.(iii) It takes place in cytoplasm and mitochondria.
(iv) Its products are CO2 and H2O.
|(i) It takes place in the absence of oxygen.(ii) It involves the incomplete breakdown of glucose.(iii) It takes place in cytoplasm.
(iv) Products are ethyl alcohol and CO2.
|(i) It takes place in micro-organisms.(ii) It is extra cellular.||(i) It takes place in higher plants and animal tissues without oxygen.(ii) It is intra cellular.|
|(i) It takes place in cytoplasm.(ii) Pyruvic acid is produced during glycolysis.||(i) It takes place in mitochondria.(ii) Pyruvic acid is used in Kreb’s cycle.|
|(i) It takes place in all living cells.(ii) It is a catabolic process.
(iii) CO2 is given out.
(iv) It takes place in all time.
|(i) It takes place only in chlorophyll bearing cells.(ii) It is an anabolic process.(iii) O2 is given out.
(iv) It takes place in day time only.
Answer the questions briefly:
- What is respiration?
- What are the phases of respiration?
- What is aerobic respiration?
- What is anaerobic respiration?
- What is glycolysis?
- What is Kreb’s cycle?
- What is fermentation?
- Write an equation to represent aerobic and anaerobic respiration.
- How is the tilling of the soil useful for the crops?
- Write the full form of ATP and ADP.
- Why is it difficult to demonstrate respiration in green plants?
- What happens to the energy released in respiration?
- What are the sites of glycolysis and Kreb’s cycle?
- Why is glycolysis considered as an important stage of respiration?
- Why is anaerobic respiration is less efficient?
- It is the step-wise oxidation of glucose in the living cells to produce energy.
- Glycolysis, Kreb’s cycle, Respiratory Chain.
- The complete breakdown of glucose in presence of oxygen is called aerobic respiration.
- The incomplete breakdown of glucose in the absence of oxygen is called anaerobic respiration.
- Te sequence of reactions which converts glucose to pyruvic acid with the
- Production of ATP is called glycolysis is oxidized into CO2 and H2O.
- The incomplete breakdown of glucose to ethyl alcohol and CO2 by micro-organisms is called fermentation.
- Tilling makes the soil porous and airy. The underground parts of plants get sufficient oxygen.
- Adenosine triphosphate-ATP
- During respiration plants give out CO2 that they use for photosynthesis. So it is difficult to demonstrate respiration in green plants.
- The energy released in respiration is stored in ATP molecules in mitochodria.
- Glycolysis is common to both aerobic and anaerobic respiration. So it is considered as an important stage of respiration.
- It is the incomplete breakdown of glucose and produces less energy. So it is less efficient.