Question
Few insects can handle the osmotic consequences of feeding on this liquid due to its high sugar content. For 10 points each:
[10e] Give this name for the fluid in a plant’s xylem and phloem.
ANSWER: sap [accept xylem sap or phloem sap; reject “syrup”]
[10m] This sugar-rich substance is extruded by sap-eating bugs like aphids. Many nectar feeders opportunistically consume this waste substance, which is otherwise flung away to avoid drowning during feeding.
ANSWER: honeydew
[10h] Wasps are used to control aphids and the invasive “brown marmorated” species of these insects, which were followed across the Pacific by the samurai wasp. These pests in the family Pentatomidae, which can damage crops while feeding, produce aldehydes like 2-decenal and 2-hexenal.
ANSWER: stink bugs [or shield bugs; accept brown marmorated stink bug]
<Biology>
Summary
| 2024 ACF Nationals | 2024-04-21 | Y | 10 | 10.00 | 60% | 20% | 20% |
Data
| Indiana | Cornell A | 10 | 0 | 0 | 10 |
| Iowa State | Illinois | 10 | 10 | 0 | 20 |
| McGill | Kentucky | 0 | 0 | 0 | 0 |
| Georgia Tech | Maryland | 10 | 0 | 0 | 10 |
| Michigan | Johns Hopkins | 0 | 0 | 10 | 10 |
| Minnesota A | Chicago A | 10 | 0 | 0 | 10 |
| NYU | Northwestern | 0 | 0 | 0 | 0 |
| Chicago B | Stanford | 10 | 10 | 10 | 30 |
| Waterloo | WUSTL A | 10 | 0 | 0 | 10 |
| Brown | Yale A | 0 | 0 | 0 | 0 |