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ACT Science: Conflicting Viewpoint Passage Drill 1, Problem 7. Which definition of the SAM is most likely to be agreed upon by both scientists?
ACT Science: Conflicting Viewpoint Passage Drill 1, Problem 10. According to Scientist 2, why do plant patterns come in waves or periods?
ACT Science: Conflicting Viewpoint Passage Drill 1, Problem 2. What do both scientists agree about?
Stressing Out PIN1 Clustering 215 Views
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Description:
ACT Science: Conflicting Viewpoint Passage Drill 1, Problem 5. What effect should mechanical stress have on PIN1 clustering?
Transcript
- 00:03
Try this shmoopy question on for size...
- 00:05
If you like this passage, hit pause.
- 00:07
It'll last longer.
- 00:14
If PIN1 clustering is important for the patterning
- 00:16
of leaves and plants, and stress is also important for patterning, what effect
Full Transcript
- 00:21
should mechanical stress have on PIN1 clustering?
- 00:24
And here are the potential answers...
- 00:35
This is a problem dealing with a lot of causes and effects.
- 00:38
It wants to know if we can determine...what causes what.
- 00:42
Let's take a look at what we know:
- 00:44
PIN1 is important for patterning.
- 00:47
Stress is important for patterning.
- 00:49
Can the scientists help us out?
- 00:51
Of course they can!
- 00:53
Scientist 2 says: "If we intentionally stress the SAM, we see that the leaves begin to take
- 00:58
on a pattern that is highly stress-dependent." So stress causes patterning.
- 01:05
Well, PIN1 is what makes patterning happen.
- 01:08
So if we stress the plant...i.e. injure it, patterns will occur...
- 01:12
...and to make the patterns occur, we need PIN1.
- 01:15
Which answer aligns with this idea?
- 01:18
Well, mechanical stress doesn't cause PIN1 to
- 01:21
run away to the roots of the plant, so D is wrong.
- 01:24
What about C?
- 01:25
"PIN1 should accumulate near the SAM regardless of stress."
- 01:29
There's something majorly wrong with this answer.
- 01:31
If we read the question carefully, it's asking us to
- 01:35
find the effect of mechanical stress on PIN1.
- 01:38
Option B. "PIN1 should be created by auxin."
- 01:41
Yeah, that's fine and dandy, but it doesn't answer our question about mechanical stress.
- 01:46
Which leaves us with A. Injuries, or stresses, do cause PIN1 to accumulate.
- 01:51
A's our answer.
- 01:52
If you need us, we'll be over here, squeezing this stress ball.
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