negative allelopathy - 2023 ARCADIA

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>

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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%
2023 ARCADIA at UC Berkeley	Premiere	N	2	20.00	100%	100%	0%
2023 ARCADIA at Carleton University	Premiere	N	3	10.00	100%	0%	0%
2023 ARCADIA at Claremont Colleges	Premiere	N	1	10.00	100%	0%	0%
2023 ARCADIA at Indiana	Premiere	N	5	8.00	40%	40%	0%
2023 ARCADIA at RIT	Premiere	N	2	20.00	100%	100%	0%
2023 ARCADIA at WUSTL	Premiere	N	3	13.33	33%	100%	0%

Data


Johns Hopkins	George Washington A	0	10	10	20
Georgetown	George Washington B	0	0	10	10
Georgetown	George Washington A	0	0	10	10
Georgetown	George Washington B	0	0	10	10
Georgetown	George Washington A	0	0	10	10
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
South Carolina A	Duke	0	0	0	0
North Carolina B	James Madison A	0	10	10	20
South Carolina B	NC State	0	10	10	20
North Carolina A	James Madison B	0	10	10	20
Emory A	Georgia B	0	10	10	20
Georgia Tech A	Georgia Tech B	10	0	10	20
Georgia Tech D	Georgia Tech C	0	10	10	20
Georgia A	Tennesse A	0	10	10	20
Georgetown	George Washington B	0	0	10	10
Georgetown	George Washington A	0	0	10	10
Georgetown	George Washington B	0	0	10	10
Georgetown	George Washington A	0	0	10	10
Maryland A	Maryland B	0	0	10	10
Kenyon A	Michigan A	0	10	10	20
Ohio State A	Kenyon B	0	10	0	10
Ohio State B	Michigan B	0	0	0	0
Farrellmagnetism	Arizona State	0	10	10	20
MSU A and Friend	Boston College	0	0	10	10
HCC	TAMU	0	10	0	10
Texas A	Texas B	0	10	10	20
Texas C	tag magnet: taylor's version	0	0	0	0