#Question id: 11185
#XL - T Zoology
Use the information in the table to answer the question. Calculate the equilibrium potential for sodium. Assume a temperature of 37°C.
#Question id: 11190
#XL - T Zoology
For a neuron with an initial membrane potential at -70 mV, an increase in the movement of potassium ions out of that neuron's cytoplasm would result in the ________.
#Question id: 11265
#XL - R Botany
Approximately how many kg of carnivore production can be supported by a field plot containing 2000 kg of plant material?
#Question id: 11270
#XL - R Botany
Consumption efficiency is the proportion of production at one trophic level that is eaten by, or ingested, by the next trophic level which of the following is correct statement?
A. Consumption efficiencies of herbivore is higher in ocean than grassland
B. In aquatic ecosystems, production efficiencies of herbivore are greater than carnivores
C. Assimilation efficiencies for carnivores are typically higher than those of herbivores
D. Assimilation efficiency depends on the quality of food eaten and the physiological efficiency of the consumer
#Question id: 11277
#XL - R Botany
If a species is a keystone predator, then its removal from a community should
(A) Increase population size of the predator’s preferred prey
(B) decrease species diversity in the prey community
(C) decrease productivity of the predator’s preferred prey
(D) increase species diversity in the prey community
#Question id: 11278
#XL - R Botany
Which of the following is true with respect to oligotrophic lakes and eutrophic lakes?
A) Oligotrophic lakes are less subject to oxygen depletion.
B) Rates of photosynthesis are lower in eutrophic lakes.
C) Eutrophic lake water contains higher concentrations of nutrients.
D)Sediments in oligotrophic lakes contain larger amounts of decomposable organic matter.