When the apparatus Klinostate rotates by fixing the seedling horizontally, after two days you can see plants stay straight. Because the rotating apparatus causes
A. accumulation of the hormone IAA on the underside.
B. the root of the seedling to bend downward.
C. IAA not to be accumulated in either side of the seedling.
D. IAA inhibits growth in the underside of the root but it promotes shoot growth.
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Answer:
a is the answer
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