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Analysing Scientific Interrelationships - Example 1
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An experiment is conducted on three plants of the same species:
- Plant 1 is not treated.
- The tip of the main shoot of plant 2 is cut off.
- The tip of the main shoot of plant 3 is cut off.
Afterwards a phytohormone is applied to the cut surface on the plant.
The plants are now placed under observation:
- The main shoot and the side shoots on plant 1 grow.
- The main shoot on plant 2 does not grow. The side shoots grow.
- The main shoot on plant 3 grows. The side shoots do not grow.
These results are generally applicable to this species of plant.
Which of the following two statements is/are correct?
I. The phytohormone promotes the growth of the main shoot of this plant species.
II. The phytohormone hinders the growth of the side shoots of this plant species.
Degree of difficulty: low
Solution
The observation results show that the main shoot and the side shoots of the untreated plant grow.
If the tip of the main shoot is cut off, the main shoot stops growing. However, the phytohormone can
be used to make a main shoot continue to grow after its tip has been cut off.
The phytohormone hence promotes the growth of the main shoot. Statement I is therefore correct.
The side shoots grow on the untreated plant and they also grow on the plant where the main shoot
was cut off at the tip. If the phytohormone is applied, however, the side shoots stopped growing.
The phytohormone hence hinders the growth of the side shoots. Statement II is hence also correct.
Alternative (C) is therefore the correct answer.
Instructions
Example 1
Example 2
Example 3
Example 4
Example 5
Example 6