What is most effective way to conserve plant diversity of an area

Options :
  1. tissue culture
  2. botanical garden
  3. biosphere reserve
  4. seed banks
Answer and Explanation :-

Answer: Option 3


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Y por que el sol es tan mal amigodel caminante en el desierto?Y por que el sol es tan simpaticoen el jardin del hospital?And why is the sun such a bad companionto the traveler in the desert?And why is the sun so congenial in the hospital garden?
-Pablo Neruda