Answer:
Streak Plate method cannot be used for the enumeration of the approximate number of bacteria in the given sample. It can used only for obtaining isolated colonies in Pure culture. This is because, In streak plate method,
1. the amount of inoculum added is not a measured quantity.
2. colony count method cannot be applied on streak plate, since except in the fourth quadrant, isolated colonies are not formed.
Thus Streak plate method can be used for qualitative and not quantitative studies, which is its disadvantage.