TLS Online TPP Program

#Question id: 7091


The development of the antero-posterior axis of Drosophila is initiated when:

#Unit 5. Developmental Biology
  1. the mother packages bicoid and nanos mRNA into the developing oocyte
  2. the Toll receptor is activated after fertilization, leading to nuclear localization of Dorsal protein
  3. the terminal group protein Torso sets up the anterior and posterior poles of the embryo
  4. the sperm enters the micropile at the anterior end, thus specifying the antero-posterior axis
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TLS Online TPP Program

#Question id: 10645

#Unit 10. Ecological Principles

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. dn/dt is isoclines when 

TLS Online TPP Program

#Question id: 10646

#Unit 10. Ecological Principles

Four sampling unit of Area occupy by species having following number is 00, 20, 10, 20. What is abundance of that species?

TLS Online TPP Program

#Question id: 10647

#Unit 10. Ecological Principles

Use the graph to answer the following question


In the figure, which of the following survivorship curves implies that an animal may lay many eggs, of which a regular number die each year on a logarithmic scale?

TLS Online TPP Program

#Question id: 10648

#Unit 10. Ecological Principles

Which statements about K are correct?

I) K varies among populations.

II) K varies in space.

III) K varies in time.

IV) K is constant for any given species.

TLS Online TPP Program

#Question id: 10649

#Unit 10. Ecological Principles

According to the logistic growth equation


A) the number of individuals added per unit time is greatest when N is one fourth of K

B) the per capita growth rate (r) increases as N approaches K

C) population growth is zero when N equals K

D) the population grows exponentially when N approaches K

TLS Online TPP Program

#Question id: 10650

#Unit 10. Ecological Principles

Following some characteristic feature of K selected species

A. semelparity 

B. Mate choice

C. Density independent mortality

D. large size of offspring

What is the above combination is correct?