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TLS Online TPP Program

#Question id: 1117

At puberty, an adolescent female body changes in both structure and function of several organ systems, primarily under the influence of changing concentrations of estrogen and other steroid hormones. How can one hormone, such as estrogen, mediate so many effects?

#Unit 4. Cell Communication and Cell Signaling

  1. Estrogen is produced in very large concentration by nearly every tissue of the body.

  2. Each cell responds in the same way when steroids bind to the cell surface.

  3. Estrogen is kept away from the surface of any cells, not able to bind it at the surface.

  4. Estrogen binds to specific receptors inside many kinds of cells, each with different responses.

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TLS Online TPP Program

#Question id: 10661

#Unit 10. Ecological Principles

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: 10662

#Unit 10. Ecological Principles

Growth model of logistic with 1000 carrying capacity and exponential with ideal condition is related to initial population. (Value of rmax = .25)


A) In Logistic growth value of X should be maximum at 1000

B) In Exponetial growth value of X should be maximum at 1000

C) In Logistic growth value of X should be maximum at 500

D) In Exponential growth value of X should be constant over size of population
TLS Online TPP Program

#Question id: 10663

#Unit 10. Ecological Principles

Following is a hypothetical life table of species


Following some statement is given

A- This type of life table is characteristic of species that produce a large number of offspring

B- Its greatest mortality early in life, with relatively low rates of death for those surviving this bottleneck

C. It is characterized by high age-specific survival probability in early and middle life, followed by a rapid decline in survival in later life

D. This includes k selected species

Which of the following above statement is correct?
TLS Online TPP Program

#Question id: 10664

#Unit 10. Ecological Principles

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)
TLS Online TPP Program

#Question id: 10665

#Unit 10. Ecological Principles

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

#Unit 10. Ecological Principles

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?