#Question id: 10670
#Section 1: Ecology
To estimate the number of foxes in an area, a researcher conducted a mark-recapture survey. In the first survey, he caught and marked N number of foxes. In his second survey a week later, he caught 120 foxes of which 90 were unmarked (recaptures). If you are told that the actual number of foxes in this area is 400, what is value of N in this area?
#Question id: 10688
#Section 2: Evolution
For two species A and B in competition, the carrying capacities, competition coefficients, per capita growth rate and population size are
KA = 1000 KB = 1200 α of B= 1 β of A= .5 rB= .5 r A= .3
AN= 500 BN= 200
According to the Lotka-Volterra model, what is growth rate of species A?
#Question id: 16861
#General Aptitude
#Question id: 3275
#Section 2: Evolution
When imbalances occur in the sex ratio of sexual species that have two sexes (that is, other than a 50:50 ratio), the members of the minority sex often receive a greater proportion of care and resources from parents than do the offspring of the majority sex. This is most clearly an example of ________.
#Question id: 11058
#Section 2: Evolution
The pufferfish, a common marine fish, has extensive spines that extend outward when it swallows water, becoming several times its normal size. This is an example of what kind of defense against predation?