5.4 Plant hormones (biology only)

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Question 18
Medium

A biology student investigated the growth of young oat coleoptiles (shoots) in response to light. They set up two groups of coleoptiles in a draught-free room:

  • Group A: The coleoptiles were placed in a box with a small window on one side, allowing light to enter from a single direction (unidirectional light).
  • Group B: The coleoptiles were placed on a slowly rotating turntable inside the same box with a small window, ensuring that all sides of the shoots received equal exposure to the light over time.
a.

What biological term is given to a plant growth response where the direction of growth is determined by the direction of a light stimulus?

[1]
b.

Explain the role of Group B in this investigation.

[1]
c.

Predict the appearance of the shoots in Group A and Group B after 48 hours.

[2]
d.

State one abiotic control variable (other than light and draughts) that must be kept constant between both groups.

[1]

5.4 Plant hormones (biology only) Questions

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