If a germinating seed is attached horizontally on a revolving klinostat, what will be the effect of the seedling after three days? The

When a germinating seed is attached horizontally on a revolving klinostat, it will experience a continuous change in orientation. This causes the gravitational stimulus to be distributed evenly throughout the seedling, and as a result, it will not show any curvature. Therefore, the correct answer is: "plumule and radicle will not show any curvature." In other words, the revolving klinostat negates the gravity's effect on the seedling and makes the seedling's growth response uniform in all directions, resulting in the absence of any curvature in the plumule (the embryonic shoot) or the radicle (the embryonic root).