Question

The following are some major events in the early history of life:
P. First heterotrophic prokaryotes
Q. First genes
R. First eukaryotes
S. First autotrophic prokaryotes
T. First animals
Which option below places these events in the correct order?

• A. $P\to Q\to S\to R\to T$
• B. $Q\to S\to R\to P\to T$
• C. $Q\to P\to S\to R\to T$
• D. $Q\to S\to P\to R\to T$

Answer 1

The correct option is D $Q\to S\to P\to R\to T$

Organisms have evolved from simpler forms to complex form. Hence the order of the events are genes first, then autotrophic prokaryotes, then heterotrophic prokaryotes, then eukaryotes and then animals.

So, the correct option is 'Q$\to$ S $\to$ R $\to$ P $\to$ T'