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09 Sep 2026, 04:32
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More than half of the weeds with high crop impact have seeds that can persist in the soil for more than 3 years.: Yes
Every sedge with at least moderate herbicide tolerance has long seed-bank persistence.: No
A single standard herbicide application is expected to control at least 90% of exactly twice as many annual weeds as perennial grasses.: Yes
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
75%
(hard)
Question Stats:
73% (03:19) correct
27%
(03:11)
wrong
based on 30
sessions
History
Date
Time
Result
Not Attempted Yet
An agricultural survey compared 24 weeds commonly found in crop fields. The table shows each weed’s growth type, potential impact on crop yield, persistence of its seeds in the soil, and tolerance to a standard herbicide treatment.
^a Crop impact: Expected effect on crop yield if the weed is left unmanaged.
^b Seed-bank persistence: Short = less than 1 year, Moderate = 1 to 3 years, Long = greater than 3 years.
^c Herbicide tolerance at the standard dose: Low = at least 90% control after one application, Moderate = at least 90% control only after repeated application, High = less than 90% control even after repeated application.
For each of the following statements, select Yes if the statement is supported by the information in the table and its legend. Otherwise, select No.
| Weed | Growth type | Crop impact^a | Seed-bank persistence^b | Herbicide tolerance^c |
|---|---|---|---|---|
| Alderweed | annual | high | long | low |
| Blueleaf | annual | moderate | moderate | low |
| Coppergrass | perennial grass | high | long | moderate |
| Dune thistle | perennial broadleaf | high | long | high |
| Ember sedge | sedge | moderate | moderate | moderate |
| Fieldstar | annual | high | moderate | low |
| Golden reed | sedge | high | long | high |
| Harborgrass | perennial grass | high | moderate | low |
| Ironleaf | perennial broadleaf | moderate | long | moderate |
| Juniper weed | annual | low | short | low |
| Knotgrass | perennial grass | high | long | high |
| Lantern sedge | sedge | high | long | moderate |
| Meadowbane | perennial broadleaf | high | moderate | low |
| Nightweed | annual | moderate | long | moderate |
| Orchard grass | perennial grass | moderate | moderate | low |
| Prairie sedge | sedge | high | long | high |
| Quickleaf | annual | high | long | moderate |
| River thorn | perennial broadleaf | moderate | short | low |
| Stonegrass | perennial grass | high | long | moderate |
| Timber weed | annual | moderate | moderate | low |
| Umbra sedge | sedge | low | moderate | low |
| Valley vine | perennial broadleaf | high | long | high |
| Willow grass | perennial grass | moderate | short | low |
| Yellowleaf | annual | high | moderate | low |
^a Crop impact: Expected effect on crop yield if the weed is left unmanaged.
^b Seed-bank persistence: Short = less than 1 year, Moderate = 1 to 3 years, Long = greater than 3 years.
^c Herbicide tolerance at the standard dose: Low = at least 90% control after one application, Moderate = at least 90% control only after repeated application, High = less than 90% control even after repeated application.
For each of the following statements, select Yes if the statement is supported by the information in the table and its legend. Otherwise, select No.
| Yes | No | |
| More than half of the weeds with high crop impact have seeds that can persist in the soil for more than 3 years. | ||
| Every sedge with at least moderate herbicide tolerance has long seed-bank persistence. | ||
| A single standard herbicide application is expected to control at least 90% of exactly twice as many annual weeds as perennial grasses. |
ShowHide Answer
Official Answer
More than half of the weeds with high crop impact have seeds that can persist in the soil for more than 3 years.: Yes
Every sedge with at least moderate herbicide tolerance has long seed-bank persistence.: No
A single standard herbicide application is expected to control at least 90% of exactly twice as many annual weeds as perennial grasses.: Yes
17 Sep 2026, 03:30
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Bunuel
Official Solution:
• More than half of the weeds with high crop impact have seeds that can persist in the soil for more than 3 years.
Sort by Crop impact and consider only the weeds rated high.
There are 14 such weeds. According to the legend, a long seed-bank persistence means greater than 3 years. Of the 14 high-impact weeds, 10 have long persistence.
Since 10 out of 14 is more than half, the statement is supported.
Answer: Yes.
• Every sedge with at least moderate herbicide tolerance has long seed-bank persistence.
Sort by Growth type and consider only the sedges. Then check those with moderate or high Herbicide tolerance.
Ember sedge has moderate herbicide tolerance but only moderate seed-bank persistence, not long persistence.
This one counterexample is enough to show that the statement is not supported.
Answer: No.
• A single standard herbicide application is expected to control at least 90% of exactly twice as many annual weeds as perennial grasses.
According to the legend, a single standard application controls at least 90% only when Herbicide tolerance is low.
Sort by Growth type and count the low-tolerance weeds.
Among the annual weeds, 6 have low herbicide tolerance.
Among the perennial grasses, 3 have low herbicide tolerance.
Since 6 is exactly twice 3, the statement is supported.
Answer: Yes.
Correct answer:
Statement 1: "Yes"
Statement 2: "No"
Statement 3: "Yes"
General Discussion
