Klinostat is employed in the study of
Osmosis
Growth movements.
Photosynthesis
Respiration
Clinostat/klinostat is an instrument which can nullify the effect of gravity and allow a plant to grow horizontally by slowly rotating it. Rotating clinostat does not show any bending because the gravitation stimulus in this case is not unilateral as it affects all the sides of the rotating organs equally. whereas plants kept in unrotated/frod clinostat bends downwards showing positive geotropism. Hence, the correct answer is option 2.