The number with the most significant zero is

0.00002510

2.5100000

0.02500001

250000001

2.501*10_7

The number having most significant zero is the number in which the zeors can be countable as a scientific basis!

so 250000001 has the most significant zeros i. e 6!

250000001 is the answer.

it has six significant zeroes.

A zero is significant if it is after both a decimal and a number. it is also significant if it is between two numbers.

the final choice

2.501*10⁷ is 25010000 has only one significant zero.