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Scott, MIT Graduate
Category: Homework
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Experience:  MIT Graduate (Math, Programming, Science, and Music)
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1. Most insects use external sources of heat to achieve their

Customer Question

1. Most insects use external sources of heat to achieve their operative temperature range. Heinrich's research on the sphinx moth (Manduca sexta) indicates that some insects can thermoregulate by using their flight muscles and: (Points: 5)
using their blood as a coolant.
decreasing their metabolic rate.
possessing an internal respiratory system.
using a countercurrent heat exchange mechanism.


2. The thermal stability of aquatic environments is a result of the: (Points: 5)
high specific heat of water.
low latent heat of vaporization of water.
low latent heat of fusion of water.
All of the choices are correct.


3. Animals that rely mainly on external sources of energy for regulating body temperature are called: (Points: 5)
epitherms.
endotherms.
ectotherms.
peritherms.


4. In general, reptiles are considered to be a/an: (Points: 5)
poikilotherm.
homeotherm.
endotherm.
heterotherm.


5. Mammalian and avian aquatic endotherms use all of the following mechanisms to thermoregulate except: (Points: 5)
fat.
internal respiratory systems.
fur or feathers.
concurrent heat exchange.


6. The water availability for organisms is determined by: (Points: 5)
internal dissolved ion concentrations.
external dissolved ion concentrations.
movement of water down its concentration gradient.
movement of water up its concentration gradient.


7. Aquatic organisms whose ionic concentration of their body fluids exceed that of their surroundings are: (Points: 5)
hyperosmotic.
hypoosmotic.
isoosmotic.
osmotic.


8. In order to survive in the desert, a camel will employ which of the following mechanisms? (Points: 5)
Face away from sun
Store water in its hump
Shed its fur
Allow its body temperature to rise


9. Saturation water vapor pressure: (Points: 5)
increases with temperature.
decreases with temperature.
parallels vapor pressure density.
both increases with temperature and parallels vapor pressure density.


10. A cicada will use which of the following mechanisms in order to survive hot, dry conditions of the desert? (Points: 5)
Nocturnal behavior
Burrowing
Torpor
Sweating


11. Herbivores, carnivores, and detritivores are all: (Points: 5)
omnivores.
autotrophs.
heterotrophs.
animals.


12. Which kingdom has the higher carbon to nitrogen ratios? (Points: 5)
Plantae
Animalia
Monera
Fungi


13. The main force in the development and refinement of prey defenses is/are: (Points: 5)
nutrition.
predators.
the prey themselves.
mate choices.


14. Several studies indicate that environmental conditions dictate plant biomass allocation; plants grown in infertile soils will allocate more energy into __________ biomass. (Points: 5)
leaf
stem
root
flower


15. Organisms which synthesize organic compounds using CO2 as a carbon source and inorganic chemicals as an energy source are: (Points: 5)
chemosynthetic heterotrophs.
chemosynthetic autotrophs.
photosynthetic autotrophs.
photosynthetic heterotrophs.


16. Fitness is defined as the: (Points: 5)
health of an individual organism.
ability of an organism to adapt to new environmental situations.
quality of offspring produced.
number of genes contributed by an individual to the next generation.


17. Secondary sexual characteristics are often considered a handicap because of increased: (Points: 5)
predation.
competition.
parasitism.
infertility.


18. An instance of __________ occurs when the plumage of male birds becomes increasingly brighter over time. (Points: 5)
contrasexual selection
intrasexual selection
intersexual selection
multisexual selection


19. Sociality is generally NOT accompanied by: (Points: 5)
cooperative feeding.
defense of the social group.
unlimited reproductive opportunities.
restricted reproductive opportunities.


20. When investigating haplodiploidy, all of the following statements were found to be true EXCEPT: (Points: 5)
siblings are more genetically related than an individual's own offspring.
males have one set of chromosomes.
kin selection is not implicated.
males develop from unfertilized eggs.
Submitted: 4 years ago.
Category: Homework
Expert:  Linda_us replied 4 years ago.
Thanks for requesting me but these question are beyond my expertise. I will opt out so that other experts can help you.

Regards

Linda
Customer: replied 4 years ago.
OK THANK YOU
Customer: replied 4 years ago.

hello

your answer is incompleted the journals enteries from 1 apr to 7 apr is missed.

Expert:  Linda_us replied 4 years ago.
Which questions are you referring to.

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