The stimulus of geotropism is gravity. Plants respond to gravity by growing in a specific direction - roots grow towards gravity (positive geotropism) and shoots grow away from gravity (negative geotropism).

geotropism mean to have fun doind the things

It is called geotropism.

Yes, geotropism DOES determine the direction of growth. Negative geotropism is when a section of the plant grows upwards. For example, stems grow upward. Positive geotropism is when a section of the plant grows downwards. In this case, a plant's roots would be the perfect example.

No