PSS exam 2 final study questions & answers 2024/2025
8 views 0 purchase
Course
PSS
Institution
PSS
PSS exam 2 final study questions & answers 2024/2025
Poikilothermic - ANSWERSbody temperature matches the temperature of their environment. insects are this. increase in temperature leads to increase in metabolism
Host regulation - ANSWERSmanipulate host physiology for the benefit of the pa...
PSS exam 2 final study questions &
answers 2024/2025
Poikilothermic - ANSWERSbody temperature matches the temperature of their environment. insects are
this. increase in temperature leads to increase in metabolism
Host regulation - ANSWERSmanipulate host physiology for the benefit of the parasitoid
physiological time - ANSWERSthe amount of heat required over time for an insect to complete
development
insect development - ANSWERSat upper and lower thresholds less development and prediction
developmental minimum or threshold - ANSWERSthe temperature below which development does not
occur
thermal constant - ANSWERStotal number of degree days needed to reach developmental stage
degree days (DD) - ANSWERSheat units that have occurred for a specific day. accumulation of heat units
above a specific temp. DD= (Tmax+ Tmin/ 2) -DT
Importance of degree days - ANSWERSused to help plan timing of pest control applications and predict
emergence of first adults
humidity - ANSWERSlow levels, pests of stored grain develop more slowly. High relative humidity (100%)
insects may drown or be more readily infected by pathogens
food quality or availability- biotec effects - ANSWERSpoor quality food or reduced food availability delays
growth
,density dependent - ANSWERSeffect of the factor on birth or death rates change with population density
density independent - ANSWERSproportion of the killed by a factor unrelated to population density
insect diversity in accordance to plants - ANSWERSinsects have diversified at the same rate as plants
according to fossils
phytophagy - ANSWERSinsects that feed on plants. 50% of insects. far more diverse than sister groups
monophagous - ANSWERSspecialized to eat only one plant or species
oligophagous - ANSWERSpredators that feed on a wide range of prey
polyphagous - ANSWERSgeneralists that can feed on more than one family. Narrow host range
phenotypic variation - ANSWERSvisibly observable variation in a population like height, color, size,
chemical composition
what plant traits matter most for a host? - ANSWERSphenotypic variation
induced defenses - ANSWERSplant damage induces chemical change. like regurgitant or spit
qualitative defenses - ANSWERSsmall molecules, toxins to interfere with metabolism, rapid response,
costly- rarer elements. like caffeine, glucosinolate
quantitative defenses - ANSWERSenergetically intensive to produce, reduce digestibility, tend to be in
high quantities, dosage dependent response. IE tannins
semiochemicals - ANSWERSchemicals used in communication between organisms
allomones - ANSWERSplant defensive compounds that harm insects
kairomones - ANSWERSchemical communication signals that benefit the receiver
compounds related to plant defense - ANSWERSsalicylic acid, jasmonic acid. They interact with each
other, sometimes negatively
antixenosis - ANSWERSnonpreference. a physical or chemical property of a plant that makes it less
attractive to insect herbivore
antibiosis - ANSWERSa plant trait that affects larval performance. certain plant varieties may produce
toxins that may affect insect development --> lower survival
evidence of antibiosis - ANSWERSdeath of immature larvae, reduction in growth rate, increased
mortality in pupal stage, small adults with lower fecundity, shortened adult lifespan, morphologically
malformed
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Bensuda. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.49. You're not tied to anything after your purchase.
