Answer:
Cellular respiration is the process by which cells convert glucose into energy in the form of ATP. The process of aerobic respiration produces huge amount of ATP from each sugar molecule. Aerobic respiration takes place in eukaryotes. The reactions involved in the respiration are catabolic reactions. From the complete oxidation of one glucose molecule to carbon dioxide and oxidation of all reduced coenzymes. It generates 30-32 ATP in each cycle and used by plants, animals and humans therefore it is highly efficient and beneficial for the society. Without photosynthesis plants will not have carbohydrates for respiration.
Endosymbiosis is the hypothesis which says that prokaryotes gave rise to the first eukaryotic cell. It explains the origin of eukaryotic cell organelles such as mitochondria in animals and fungi and chloroplast in plants have evolved from prokaryotes like mitochondria has evolved from proteobacteria and chloroplast from cynobacteria. It simply defines that primitive simple organisms evolved in order to develop as complex organisms. If endosymbiosis had not occurred on earth than there would be no diversity in life forms on earth.
