Which of the following is not caused by a growth movement?

The plant part which exhibits negative geotropism is:

A big tree falls in a forest but its roots are still in contact with the soil. The branches of this fallen tree grow straight up (vertically). This happens in response to

The root of a plant is:

Options -

(i) positively phototropic but negatively geotropic

(ii) positively geotropic but negatively phototropic

(iii) negatively phototropic but positively hydrotropic

(iv) negatively hydrotropic but positively phototropic

The main function of the plant hormone called abscisic acid is to: