the roots
The roots of a plant exhibit positive geotropism or gravitropism because they grow toward the direction of the pull of gravity.
chloroplast
In the organelle called the chloroplast.
Plants are green because they reflect green light more than any other part of the color spectrum, therefore if a plant is only exposed to green light it will reflect.
They are called chloroplasts.
The root
chloroplast
It is the movement of organism or cell in response to light whether in the direction of light( positive phototaxis) or in the opposite direction ( negative phototaxis). the positive phototaxis is usually occurs in roots of plants whereas the negative photataxis occurs in remaining or outer part of plant in order to get light for photosynthesis.
the leaves is the part of a land-plant that uses light to make food material
Tropism is the growth response of a plant caused by a stimulus. Gravitropism is the growth response of plant to gravity. The roots grow downward towards gravity, which is called positive gravitropism. The stem and upper part of a plant grow upward, away from gravity, which is called negative gravitropism.
The roots of a plant exhibit positive geotropism or gravitropism because they grow toward the direction of the pull of gravity.
the chloroplast
ROOT
the chlorophyll which are in the chloroplasts.
Death:D
This is due to tropic movement(tropism) in plants in which the fixed part of a plant(such as stem) moves in response to a stimulus.If the stimulus is light(as you have asked) then it is termed as Phototropism.And further more stem shows positive phototropism.
The part of the silver halide crystal that is most affected by light when film is exposed is the surface. More specifically, any sensitivity specks that can become metallic silver.