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Two plants can be conclusively said to belong to the same species if they

1. have more than 90 per cent similar genes
2. look similar and possess identical secondary metabolites
3. have same number of chromosomes
4. can reproduce freely with each other and form seeds.

Correct answer: can reproduce freely with each other and form seeds.

Solution

Under the biological species concept, members of the same species must be able to interbreed naturally and produce viable, fertile offspring. The ability to reproduce freely and form seeds is the strongest evidence here; the other traits can vary within a species or be shared across different species.

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