What is the best example of tropism in plants

Explanation:

Some plants (flowers or leaves or both) follow the sun as it arcs across the sky each day; sunflowers (Figure below) are a well-known example. This behavior is misleadingly called heliotropism. Helio- does refer to the sun, but a tropism implies growth in a certain direction, and heliotropism does not involve growth.

1 and 6 for apex

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.