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Endosymbiosis is a type of symbiotic relationship exhibited by certain organisms in which one organism resides inside the other. The endosymbiotic theory has proved that many organisms have evolved through this relationship. It is also said that mitochondria and chloroplasts also evolved through this.

In the absence of mitochondria, the products food and energy cannot be metabolized. Due to this, mitochondria are essential for the photosynthetic products to be metabolized. However, this does not prove that mitochondria evolved before plastids.

Thus, the impaired metabolism of photosynthetic products does not prove that mitochondria evolved before plastids.

Therefore, the given statement is false.

Most eukaryotes evolved in such a way that they either gained or lost plastids. The organisms that gained plastids were those that required these plastids for photosynthesis, while those that lost these plastids did not perform the photosynthetic process.

However, the mitochondria were essential for metabolizing several products, and hence they remained.

Thus, scientists explained that endosymbiosis produced mitochondria before plastids. This is because all eukaryotes possess mitochondria but not all possess plastids.

Therefore, the given statement is true.

The mitochondrial DNA of eukaryotes resembles prokaryotic DNA because they have evolved from prokaryotes. Therefore, the plastids cannot resemble prokaryotic DNA as much as mitochondrial DNA.

Thus, mitochondria have evolved before plastid and not vice versa.

Therefore, the given statement is false.

Mitochondria is an important cell organelle that takes up oxygen from the atmosphere and liberates carbon dioxide. However, the presence or absence of carbon dioxide is not an indicatorof whether mitochondria evolved first or did plastids.

Thus liberation of carbon dioxide does not help understand whether mitochondria or plastids evolved first.

Therefore, the given statement is false.