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Question

Two plants can be conclusively said to belong to the same species, if they
  1. Can reproduce freely with each other and form seeds
  2. Have more than 90 percent similar genes
  3. Look similar and possess identical secondary metabolites
  4. Have same number of chromosomes

A
Look similar and possess identical secondary metabolites
B
Have same number of chromosomes
C
Can reproduce freely with each other and form seeds
D
Have more than 90 percent similar genes
Solution
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Species refers to the basic unit of biological classification and a taxonomic rank, it defines a group of potentially interbreeding natural populations and can be reproductively isolated from other similar groups. While a molecular marker would have given a clearer distinction, this works out as a useful formulation that shows the impact of sexual reproduction on the dynamics of natural selection.
Therefore, the correct answer is option A.

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