5.4 Plant hormones (biology only)

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Question 4
Easy

A student investigated the effect of gravity on the growth of seedling roots. They set up two experiments in a dark room:

  • Experiment 1: Seedlings were fixed horizontally on a stationary stand, allowing gravity to act continuously in one direction.
  • Experiment 2: Seedlings were fixed horizontally on a slowly rotating wheel (klinostat), spreading the effect of gravity equally on all sides.
a.

What biological term is given to a growth response of a plant towards or away from a directional stimulus?

[1]
b.

What is the role of Experiment 2 in this investigation?

[1]
c.

Predict the appearance of the roots in Experiment 1 and Experiment 2 after 48 hours48\text{ hours}48 hours.

[2]
d.

Give one control variable (other than light) that must be kept constant between both experiments.

[1]

5.4 Plant hormones (biology only) Questions

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