Question
Like autotoxicity, the accumulation of this phenomenon’s remnants contributes to “replant disease,” or the inability of new plants like apples to establish themselves in soil formerly inhabited by a related species. For 10 points each:
[10h] Name this condition, classically exemplified by the black walnut tree, in which a plant’s roots or leaf litter release biotoxins like juglone to inhibit the growth and reproductive potential of a competing organism.
ANSWER: negative allelopathy [prompt on amensalism]
[10m] Toxic allelochemicals can be released into the soil through the decay of leaf litter into humus in this horizon, which surmounts the A horizon.
ANSWER: O horizon [prompt on topsoil]
[10e] This crop’s production of momilactone B underlies its potential use as a weed-killing allelopathic agent. A “golden” GMO strain of this crop gets its color from beta-carotene, a precursor to Vitamin A.
ANSWER: rice
<KT, Biology>
Summary
| 2023 ARCADIA at Duke | Emory, Duke, Yale | Y | 4 | 15.00 | 75% | 75% | 0% |
| 2023 ARCADIA at Emory | Emory, Duke, Yale | Y | 4 | 20.00 | 100% | 75% | 25% |
| 2023 ARCADIA at Imperial | Imperial | Y | 5 | 8.00 | 80% | 0% | 0% |
| 2023 ARCADIA at Maryland | Maryland, Online | Y | 4 | 12.50 | 100% | 25% | 0% |
| 2023 ARCADIA at Ohio State | Ohio State, Texas | Y | 3 | 10.00 | 33% | 67% | 0% |
| 2023 ARCADIA Online | Maryland, Online | Y | 2 | 15.00 | 100% | 50% | 0% |
| 2023 ARCADIA at Texas | Ohio State, Texas | Y | 3 | 10.00 | 33% | 67% | 0% |
Data
| Oxford | Cambridge A | 0 | 0 | 10 | 10 |
| Edinburgh | Cambridge B | 0 | 0 | 0 | 0 |
| Durham | Birmingham | 0 | 0 | 10 | 10 |
| Warwick | Imperial A | 0 | 0 | 10 | 10 |
| Imperial B | Bristol | 0 | 0 | 10 | 10 |