TLS Online TPP Program

#Question id: 12576


Estimates of current rates of extinction

#Section 5: Applied Ecology & Evolution
  1. Indicate that we  have reached a  state of  stable equilibrium  in  which  speciation and extinction rates are approximately equal.
  2. Suggest that one-half of all animal and plant species may be gone by the year 2100.
  3. Indicate that rates may be greater than the mass extinctions at the close of the Cretaceous period. 
  4. Indicate that only 1% of all of the species that have ever lived on Earth are still alive.
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TLS Online TPP Program

#Question id: 10665

#Section 2: Evolution

Complete the following hypothetical life table of a species. 


Initial population size is 1000. What will be population size in next generation?


TLS Online TPP Program

#Question id: 10666

#Section 2: Evolution

In a experimental invertebrate population the birth rate is 1200 per 1000 and death rate is 300 per 1000 per generation. Initial population size is 10000. What is value of NET reproductive rate?

TLS Online TPP Program

#Question id: 10667

#Section 2: Evolution

Which of the following is correct statement?

A) The average number of offspring that female producing during life time is called NET reproductive rate

B) The number of birth minus the number of death per generation time called called per capita growth rate

C) The average number of female offspring that female producing during life time is called NET reproductive rate

D) The average number of offspring that breeding male and female producing during life time is called NET reproductive rate

TLS Online TPP Program

#Question id: 10668

#Section 2: Evolution

Following table was shown life table where (S(x)= Live Individual , b(x) = Age specific fertility rate , g(x)= Death rate. What is NET reproductive rate?


               

TLS Online TPP Program

#Question id: 10669

#Section 2: Evolution

The three graphs (A, B, C) show population growth (N) patterns in relation to N or time (t)


Which of the following above graph showing exponential growth?


TLS Online TPP Program

#Question id: 10670

#Section 2: Evolution

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?