Chromosome number is

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(A) The chromosome number is a characteristic feature that remains fixed for a particular species.Each species has a specific and constant number of c

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Fixed for a species

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(A) The chromosome number is a characteristic feature that remains fixed for a particular species.Each species has a specific and constant number of chromosomes in its somatic cells.For example, the lowest chromosome number is seen in $Haplopappas 	ext{ } gracilis$ $(2n = 4)$, while the maximum number is found in $Ophioglossum$ species ($2n = 1262$ or up to $1656$ depending on the variety).Therefore, the correct option is $A$.

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