ACT Science 1.5 Conflicting Viewpoint Passage
ACT Science: Conflicting Viewpoint Passage Drill 1, Problem 5. What effect should mechanical stress have on PIN1 clustering?
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Inferences and Trends
should mechanical stress have on PIN1 clustering?
And here are the potential answers...
This is a problem dealing with a lot of causes and effects.
It wants to know if we can determine...what causes what.
Let's take a look at what we know:
PIN1 is important for patterning.
Stress is important for patterning.
Can the scientists help us out?
Of course they can!
Scientist 2 says: "If we intentionally stress the SAM, we see that the leaves begin to take
on a pattern that is highly stress-dependent." So stress causes patterning.
Well, PIN1 is what makes patterning happen.
So if we stress the plant...i.e. injure it, patterns will occur...
...and to make the patterns occur, we need PIN1.
Which answer aligns with this idea?
Well, mechanical stress doesn't cause PIN1 to
run away to the roots of the plant, so D is wrong.
What about C?
"PIN1 should accumulate near the SAM regardless of stress."
There's something majorly wrong with this answer.
If we read the question carefully, it's asking us to
find the effect of mechanical stress on PIN1.
Option B. "PIN1 should be created by auxin."
Yeah, that's fine and dandy, but it doesn't answer our question about mechanical stress.
Which leaves us with A. Injuries, or stresses, do cause PIN1 to accumulate.
A's our answer.
If you need us, we'll be over here, squeezing this stress ball.