TLS Online TPP Program

#Question id: 4648


In a hypothetical environment, fishes called pike-cichlids are visual predators of algae-eating fish (i.e., they locate their prey by sight). If a population of algae-eaters experiences predation pressure from pike-cichlids, which of the following should least likely be observed in the algae-eater population over the course of many generations?

#Section 2: Evolution
  1. Selection for drab coloration of the algae-eaters

  2. Selection for nocturnal algae-eaters (active only at night)

  3. Selection for larger female algae-eaters, bearing broods composed of more, and larger, young

  4. Selection for algae-eaters that become sexually mature at smaller overall body sizes

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TLS Online TPP Program

#Question id: 10654

#Section 1: Ecology

Complete the following hypothetical life table for a bird

 

What will be population size in next generation?

TLS Online TPP Program

#Question id: 10655

#Section 1: Ecology

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.

TLS Online TPP Program

#Question id: 10658

#Section 1: Ecology

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


Which of the following conclusions hold true?

TLS Online TPP Program

#Question id: 10660

#Section 1: Ecology

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?

TLS Online TPP Program

#Question id: 10661

#Section 1: Ecology

Semelparous species are those that produce all of their offspring in a single reproductive event. The survivorship curve of a population of a semelparous species would most likely resemble which of the following? 



TLS Online TPP Program

#Question id: 10664

#Section 1: Ecology

dN/dt = rN (K-N/K ) The logistic equation above is used to describe the rate of change of a population, N, with time, t, Where r is the intrinsic rate of increase and K is the carrying capacity. What is value of per capita growth rate when population size is 200 individuals? ( K= 400, r =.25)