PHOTOSYNTHESIS
THE CHLOROPLAST
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Mitochondria make energy and cells need energy more than the sugars produced by chloroplasts.
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All eukaryotes have mitochondria including plants and algae, but only plants and algae have chloroplasts as well as mitochondria. This suggests, that the first eukaryotic cells first accquirred mitochondria and chloroplasts came later.
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We actually do not know which one came first-this happened too long ago for us to know about.
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Detailed explanation-1: -The evidence suggests that these chloroplast organelles were also once free-living bacteria. The endosymbiotic event that generated mitochondria must have happened early in the history of eukaryotes, because all eukaryotes have them.
Detailed explanation-2: -Mitochondria and chloroplasts likely evolved from engulfed prokaryotes that once lived as independent organisms. At some point, a eukaryotic cell engulfed an aerobic prokaryote, which then formed an endosymbiotic relationship with the host eukaryote, gradually developing into a mitochondrion.
Detailed explanation-3: -Mitochondria and chloroplast are the organelles which possess their own DNA and ribosomes and considered as endosymbionts of a cell. They are originated by the endosymbiosis fro proteobacteria and cyanobacteria respectively.
Detailed explanation-4: -Endosymbiosis is an evolutionary theory which posits that eukaryotic cells arose from prokaryotic cells. The theory further articulates that the mitochondria found in today’s eukaryotes evolved from aerobic bacteria and that the chloroplasts found in today’s plant cells arose from cyanobacteria.