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Question 34

From Biology HL Paper 1 (May 2024, TZ2)

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  1. A group of students investigated the effect of auxins on shoots subjected to different treatments. The diagrams show one of these treatments (T1) and the control (C) at the start of the experiment and after a week. Light was provided from all directions during the experiment.
The diagram shows two sets of potted plants, one at the 'Start of experiment' and another 'After a week'. Each set has two plants labeled 'T1' and 'C'. Plant T1 at the start has an 'Impermeable sheet' covering its tip. After a week, plant T1 shows no growth, while plant C shows significant growth.
The diagram shows two sets of potted plants, one at the 'Start of experiment' and another 'After a week'. Each set has two plants labeled 'T1' and 'C'. Plant T1 at the start has an 'Impermeable sheet' covering its tip. After a week, plant T1 shows no growth, while plant C shows significant growth.

What could be an explanation for the results obtained for T1 after a week?

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