The answer is negatively phototropic and positively gravitropic.
Phototropism is reaction of a plant to a
light stimulus. Growth of the plant or its part grow towards the light
stimulus is called positive phototropism. Growth of the plant or its
part away from the light stimulus is called negative phototropism. Since, the plant grows away from the sunlight (away from the light stimulus), it is negatively phototropic.
Gravitropism is reaction of a plant to
gravity. Growth of the plant or its part in the same direction
as gravity is called positive gravitropism. Growth
of the plant or its part grow in the opposite direction
of gravity is called negative gravitropism. The root is positively gravitropic (grows deeply straight down into the ground, in the
same direction as gravity).
