Usually, a load bearing wall will be perpendicular to the roof ridge.
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You will need to go to the level above the wall. If girders, joists or another wall is supported by your initial wall, then that becomes a 'load'. Supported by by the wall downstarirs, Thus bearing a load
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A wall without column structure. The wall itself support the loading from the upper floor. In conventional structure, the column support the loading from the upper beam and transfer it to the lower beam.
All exterior walls in a home are load bearing. The exterior walls on the gable end of your house do not bear much load, but the walls that the hip of the roof bear on carry your roof and ceiling joints. Interior walls are another story. Usually in a smaller one story home there is a wall that runs the midspan of the house that is load bearing for your roof and ceiling joints.
That can't be answered without seeing the details of your plans.