AIIMS 2019 Botany Endosymbiotic Theory Assertion Reason Question

Option A is correct because both mitochondria and chloroplasts possess their own circular DNA and ribosomes, resembling prokaryotic structures, which supports the endosymbiotic theory. This theory posits that these organelles originated from free-living prokaryotes that were engulfed by ancestral eukaryotic cells. The assertion about their RNA sequence similarity is misleading; while they share some genetic features, they do not derive from the same RNA sequence. Other options are not applicable, as they do not provide relevant information or alternatives to the assertion and reasoning presented. Understanding the endosymbiotic theory is crucial for grasping the evolutionary relationship between eukaryotic cells and their organelles.