Reserpine is an active chemical of which plant?

The correct answer is Option (1) → Rauwolfia vomitoria

Option (2) Azadirachta indica — Incorrect. This is neem, whose uses were the subject of patent claims (biopiracy).

Option (3) Carica papaya — Incorrect. This is papaya, a fruit plant.

Option (4) Mangifera indica — Incorrect. This is mango; India has more than 1,000 varieties of it.

NCERT Extract:
Biodiversity – “… (i) Genetic diversity : A single species might show high diversity at the genetic level over its distributional range. The genetic variation shown by the medicinal plant Rauwolfia vomitoria growing in different Himalayan ranges might be in terms of the potency and concentration of the active chemical (reserpine) that the plant produces.”