Continuity and Change D.7 Reproduction (id: 1dce0fdeb)

本题目来源于试卷: Continuity and Change D.7 Reproduction，类别为 IB生物学

[问答题]
The graph shows the effecf y g 6wi9,qb dq9r2c8mrz9 9hz*fyo4ztit 1mp,y6 ly4hvlv9trylzvtf :3 l*/6 of differing concentrations of the growth hormone Indole-3-acetic acid (IAA) on the shoot growth rate of the sesame seed plant (Sesamum indicum). IAAy6iz*r vv1t3m, v/:ty 4tphllfl 96yl is an auxin.

1.1.Describe the trend shown in the graph.

1.2.Outline one reason that percentage change was used rather than change in length.

2.1.State two variables that would need to be controlled in this experiment.

2.2.Explain why it is important that one of the factors you chose in (i) needs to be controlled in this experiment.

3.1.Explain how auxins such as IAA promote shoot growth.

3.2.Deduce, with a reason, which concentration of IAA should be used to grow sesame seed plants.

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