A species of fish is found to require a certain water temperature, a particular oxygen content of the water, a particular depth, a rocky substrate on the bottom, and a variety of nutrients in the form of microscopic plants and animals to thrive. These requirements describe its 

#Question id: 10655

#Section 2: Evolution

Which of the following statements about the evolution of life histories is correct?

A) Unstable environments with unlimited resources favor r-selected populations.

B) K-selected populations are most often found in environments where density-independent factors are important regulators of population size.

C) Most populations have both r- and K-selected characteristics that vary under different environmental conditions.

D) The reproductive efforts of r-selected populations are directed at producing just a few offspring with good competitive abilities.

#Question id: 10656

#Section 2: Evolution

Which of the following is an incorrect statement about the regulation of populations?

A) The logistic equation reflects the effect of density independent factors, which can ultimately stabilize populations around the carrying capacity.

B) Density-independent factors have an increasingly greater effect as a population’s density increases.

C) High densities in a population may cause physiological changes that inhibit reproduction.

D) Because of the overlapping nature of population-regulating factors, it is often difficult to precisely determine their cause-and-effect relationships.

#Question id: 10657

#Section 2: Evolution

Assuming these age-structure diagrams describe human populations, in which population is unemployment likely to be a societal issue in the future?

#Question id: 10658

#Section 2: Evolution

The accompanying figure shows population growth pattern for two species in the same habitat

Which of the following conclusions hold true?

#Question id: 10659

#Section 2: Evolution

Ecological and crude density of fish prey in related with predator. Water level is drop during the dry season and further increases in a rainy season. Following some observation effect are present on their density

 A) Ecological density is not change with respect to water level       

 B) Ecological density is gradually decrease with low water level

 C) Crude density increases over ecological density during low water level             

 D) Ecological density increases while crude density decreases during low water level

 E) There is no effect on crude density with seasonal water level

 Which of the following above observation is correct?

#Question id: 10660

#Section 2: Evolution

Given below are growth equations where dN/dt is defined as

A.  rN

B. rN[(K-N)/N]

With reference to the above equations, which one of the following statements is incorrect?