SSCE VCE Biology Scientific Investigation and Research Methods: An experiment was conducted to t

Question

An experiment was conducted to test the following two hypotheses about the effect of the plant growth regulator indoleacetic acid (IAA):

- Hypothesis 1 – Low concentrations of IAA stimulate root growth and have no effect on shoot growth.
- Hypothesis 2 – Concentrations of IAA above 0.01 parts per million stimulate shoot but inhibit root growth.

In the experiment, radish seedlings were grown in different concentrations of IAA, as indicated in the table below.

| Concentration of IAA (parts per million) | Stimulation (+) / inhibition (-) of shoot growth (%) | Stimulation (+) / inhibition (-) of root growth (%) |
|-------------------------------------------|----------------------------------------------------|-------------------------------------------------| 
| 0.00001                                   | +10                                                | -30                                            |
| 0.0001                                    | -20                                                | -50                                            |
| 0.001                                     | -60                                                | -70                                            |
| 0.01                                      | -60                                                | -80                                            |
| 0.1                                       | -90                                                | -100                                           |
| 100                                       | -90                                                | -100                                           |

Which one of the following is a reasonable conclusion to draw from the results of the experiment?

A. Only Hypothesis 1 is supported.
B. Only Hypothesis 2 is supported.
C. Hypotheses 1 and 2 are both supported.
D. Hypotheses 1 and 2 are not both supported.

An experiment was conducted to test the following two hypotheses about the effect of the plant growth regulator indoleacetic acid (IAA): - Hypothesis 1 – Low concentrations of IAA stimulate root growth and have no effect on shoot growth - VCE - SSCE Biology - Question 15 - 2016 - Paper 1

Which one of the following is a reasonable conclusion to draw from the results of the experiment?

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