Practice question

MCQ

Question

The evolution of algal lineages is closely linked to endosymbiotic events. Which of the following statements best explains the origin and diversification of plastids in different algal groups?

Options

Choose one · Correct answer highlighted

Primary plastids originated from a eukaryotic host cell engulfing a red algal ancestor, followed by secondary endosymbiosis leading to the diversification of green and brown algal lineages. Primary plastids evolved through the engulfment of a cyanobacterium by a eukaryotic host, while secondary and tertiary endosymbiosis involving red and green algae gave rise to plastids in diverse algal lineages such as diatoms and dinoflagellates. Correct All algal lineages acquired plastids through multiple independent primary endosymbiosis events, with cyanobacteria being engulfed by both red and green algal ancestors. Secondary endosymbiosis was responsible for the origin of primary plastids in green algae, while tertiary endosymbiosis involving diatoms led to the evolution of plastids in red algae.

Explanation

the evolution of algal lineages is closely operates via Primary plastids evolved through the engulfment of a cyanoba represents established outcome. functional assays validates option B. Other options propose substrate or regulatory direction, inconsistent with published kinetics and mutant phenotypes.

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