Question

53. Females are likely to mate with more than one male when

Select one:

a. resources can�t be monopolized, as in robins who eat worms.

b. only some males are able to get good territories.

c. predation on eggs or on young is high.

d. the male stays with the young and/or the eggs.

e. both c and d

54. In many species, females are certain of their parenthood; males are not. Eggs and live births require a larger investment of energy than do sperm. Therefore,

Select one:

a. Male success is more dependent than is female success on the number of times he mates.

b. Female success is more dependent than is male success on the number of times she mates.

55. In many species, females are certain of their parenthood; males are not. Eggs and live births require are larger investment of energy than do sperm. Therefore,

Select one:

a. Females tend to be more competitive; males tend to be more choosey.

b. Males tend to be more competitive; females tend to be more choosey.

c. Female competition results in weaponry.

Answer 1

Answer 53) both options c and d.

Explanation - The female birds adapt this strategy to maintain their generation by developing more number of offsprings and as they have options like male guards and nuture the young ones they can utilize this benefit to increase their progeny to acquire better progeniss of its species.

Answer 54)Male success is more dependent than is female success on the number of times he mates.

Explanation - Females produce eggs, make a larger parental investment prior to mating. While, the Males  replenish their gamete supply and return to the he mating pool sooner than females because they produce small, cheap sperm rather than large, costly eggs.

Answer 55)Males tend to be more competitive; females tend to be more choosey.

Explanation - The presence of a female  directly increases the resource of a territory or shelter and thus the males prefer to accept the risk of competition  when female is present. The smaller males  of a species are also more likely to engage in competition  with larger males in the presence of a females.