The root of a plant is :
(i) positively phototropic but negatively geotropic
(ii) positively geotropic but negatively phototropic
(iii) negatively phototropic but positively hydrotropic
(iv) negatively hydrotropic but positively phototropic
(b) (ii) and (iii)
The root of a plant is positively geotropic, negatively phototropic and positively hydrotropic.