Welcome Learners to the most conceptual and interesting content “Anaerobic respiration in plants”. Open your Geeta of Biology-NCERT BIOLOGY XI and dive into the facts embeded in this chapter. Read every NCERT line most carefully to understand what it says.
However respiration is the multi steps dehydrogenation, where a respiratory substrate is oxidised into carbon dioxide and water with release of metabollic energy as ATP.
Understanding the Basics of Anaerobic respiration in plants:
In Plant respiration we will discuss only about the physiology of respiration. In otherwords you can call it as cellular respiration. On the basis of definition respiration is the breakdown of C-C energy rich bnds to release energy as main product. Respiration is the reverse process of photosynthesis.
On the basis of respiratory substrate involved in respiration, there are two main types of respiration.
Floating respiration, in which respiratory substrate is carbohydrate or lipid.
Protoplasmic respiration, in which RS is the protein.
Protoplasmic respiration is harmful respiration.
Key Concepts:
Overview of Plant Respiration:
PLant doesn’t have respiratory system. Every organ of plant carry gaseous exchange. Like other organisms, Plans also carry out cellular respiration in the seme steps.
Glycolysis, the First Step:
- Glycolysis is a 10 step process. !0 important enzymes catalise the steps. Most of the steps are reversible except steps like 1,3,10. Some main enzymes of glycolysis are Hexokinase, PFK, Isomerase, Phosphoglycerokinase, Enolase and Pyruvate kinase.
The substrate of glycolysis is Glucose or fructose and the end products are two molecules of pyruvic acids. Glycolysis is anaerobic respiration and takes place in the cytoplasm. In this process, less than 7% of the total energy of respiration is released.
Fermentation
It is the most common synonym for anaerobic respiration. In organisms where mitochondria are absent, you will find anaerobic respiration. It is a less energy-yielding process. Hence microbes as well as yeast are slow-growing.
Aerobic Respiration starts with the oxidation of Pyruvate inside mitochondria. There are three steps of aerobic respiration such as Link reaction, Kreb’s cycle and Terminal Oxidation.
Respiration is the only key source of energy for organism. Whether it is anaerobic respiration in yeast and prokaryotes or Aerobic respiration in plants and animals, it produces the energy for activities of life.