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

Data

Johns HopkinsGeorge Washington A0101020
GeorgetownGeorge Washington A001010
GeorgetownGeorge Washington B001010
GeorgetownGeorge Washington B001010
GeorgetownGeorge Washington A001010
GeorgetownGeorge Washington A001010
GeorgetownGeorge Washington B001010
GeorgetownGeorge Washington B001010
GeorgetownGeorge Washington A001010
Maryland AMaryland B001010