The function of phototropism can be compared best with the function of gravitropism by taking an example of statoliths (Starch molecules) in roots and auxin in stem.
Roots often bend away from light (i.e., exhibit negative phototropism) in the direction of gravity(i.e. exhibit positive gravitropism).
Whereas stem-like organs drive their growth toward the light (i.e., positive phototropism) and away from gravity (i.e., negative gravitropism) (i.e. positive gravitropism).
As in the instance of phototropism, positive tropisms react by migrating towards the direction of the stimulus source.
Auxin formation and blue light stimulation control this response's mechanism.
On the shaded side of the plant, where those cells are starting to elongate, the activation of the blue light results in a concentration of auxin, a plant hormone.
On the other hand, negative tropisms, like gravitropism in plant shoots, react by migrating away from the stimulus's source.
A unique type of cell called a statocyst contains statoliths, which are starch molecules that can settle within the statocysts in reaction to gravity.
These starch molecules accumulate on the bottom of the statocyst as they descend toward gravity, increasing auxin levels and encouraging cell elongation.
Hence, these two processes can be compared best with an example of statoliths (Starch molecules) in roots and auxin in stem.
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