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In the early part of this century, the D...

In the early part of this century, the Danish botanist Peter Boysen-Jensen and the Hungarian botanist Arpad Paal showed that the bending of a grass seedling towards light is caused by a

A

a diffusible chemical

B

a flow of ions

C

a neural impulse

D

an electrical gradient

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The correct Answer is:
A
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Charles Darwin and his son Francis discovered (around 1880) that a grass seedling bends towards light only if the

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