Practice Questions

TLS Online TPP Program

#Question id: 10660

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?

#Section 1: Ecology

A represents exponential growth and B represents logistic growth.
A represents no limiting resource and B represents limited resource
A represents, Per capita growth rate increases over time while B represents per capita growth rate constant with respect to N
A represents maximum growth rate at higher value of N and B represents maximum growth rate at half of carrying capacity

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TLS Online TPP Program

#Question id: 12959

#Section 5: Applied Ecology & Evolution

Ozone layer depletion, since the 1970s, is primarily

TLS Online TPP Program

#Question id: 12960

#Section 5: Applied Ecology & Evolution

The Norway rat (Rattus Norvegicus), a widespread pest, was controlled for about a decade by the anticoagulant warfarin. This chemical substance, placed in food pellets, is absorbed by the intestinal tract and inhibits the clotting of blood. After a population decline for about 10 years, rat populations increased and stabilized. In one European population, as illustrated in the graph below, the percentage of rats resistant to warfarin has remained fairly stable over a number of years.

Resistance to warfarin is governed by a dominant autosomal gene, R. More than 15 percent of the resistant animals are heterozygous at this locus (Rr). The table below indicates the response to warfarin and relative reproductive fitness of individuals that are homozygous or heterozygous for the dominant gene (R). The RR individuals have a 20-fold increase in vitamin K requirement over individuals.

Fitness is a measure of the reproductive success of a particular genotype. The highest fitness is 1.00.

Which of the following is most likely correct concerning the gene for resistance to warfarin?

TLS Online TPP Program

#Question id: 12687

#General Aptitude

If the diagonals of two squares are in the ratio of 2 : 5, their area will be in the ratio of

TLS Online TPP Program

#Question id: 16842

#General Aptitude

Bolt from the blue

TLS Online TPP Program

#Question id: 16843