Investigation of Auxins on Plant Tropism

These flashcards cover key concepts from the investigation of auxins on plant tropism, including variables, expected outcomes, and explanations for observed results.

What was the independent variable in the investigation of auxins on plant tropism?

The treatment applied to the growing tips of the plants (presence or absence of auxins).

What were two controlled variables in the plant tropism investigation?

1. The species of the plants. 2. The duration the plants were kept in darkness (72 hours).

What were the expected results for plants in Group A?

Group A plants were expected to show no response to auxins since they received no treatment.

What were the expected results for plants in Group C?

Group C plants were expected to exhibit little to no growth or bending towards light since they received agar without auxins.

How was the reliability of the investigation ensured?

The reliability was ensured by controlling variables such as using the same plant species and maintaining consistent conditions (e.g., darkness for 72 hours).

Why did the stems of the plants in the group bend towards the right-hand side after 72 hours?

The stems bent towards the right due to the differential growth caused by auxins, which promote cell elongation on one side, resulting in bending towards the side with less auxin exposure.