Multiple choice

Chromosome number is

  1. fixed for a species

  2. fixed for a community

  3. fixed for a ecosystem

  4. fixed for a biosphere

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A Correct answer
Explanation

Chromosome number is fixed for a species. The lowest number is seen in Haplopapas gracilis (Asteracease), i.e. 2n = 4 and maximum in some Ophiglosum species (pteridophyte), i.e. 2n = 1656.