2. Regarding gravitropism when a plant root is put horizontally, which of the following is TRUE?
(A) Statolith is composed of lipid.
(B) Statolith triggers the redistribution of calcium in root cells.
(C) High concentration of auxin in the lower side of root cell increases the cell elongation.
(D) Blue light signal is involved in gravitropism.
(E) Fertilizer induces the gravitropism.

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統計： A(1), B(77), C(18), D(2), E(0) #2911210