A student conducted an investigation to study gravitropism. The control group was planted normally, while the experimental group was planted
upside down. After seven days, the control group looked normal. The
experimental group after 7 days the roots started to grow toward the
direction of gravity.
Which statement best explains why the experimental group started to
grow toward the ground?

Select one:
a. Vascular tissues absorbed more nutrients in the control than the experimental
group
b. Water evaporated faster in the experimental group than the control group
c. The experimental group has a higher chance of absorbing water and nutrients
than the control group
d. A hormone was stimulated in the root system