I wouldn't call them fruits, but yes, if you have a large C partition for just the OS and then a D partition for everything else, the drive must seek through the empty space to the slower accessed inside of the platter, slowing transfer down.
Plus, you get last wasted space with 1 partition.
ANd if you don't know what a partition is in the first place, you needn't mess around with many partitions, cause you will loose data if you don't know what you're doing.