TLS Online TPP Program

#Question id: 20326


Which of the following is an auto inducer for Vibrio fischeri?

#Unit 4. Cell Communication and Cell Signaling
  1. Homoserine O-acetyltransferase 
  2. N-acyl homocysteine lactone molecules 
  3. N-acyl homoserine lactone molecules
  4. Homoserine dehydrogenase 
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TLS Online TPP Program

#Question id: 11379

#Unit 10. Ecological Principles

Which of the following is NOT a prediction arising out of Wilson-MacArthur's -Theory of Island Biogeography?

TLS Online TPP Program

#Question id: 11380

#Unit 10. Ecological Principles

Which of the following is/are NOT valid explanation(s) for the observed pattern of species richness?

TLS Online TPP Program

#Question id: 11381

#Unit 10. Ecological Principles

Which of the following is decreasing order of NPP per unit area of different ecosystem?

TLS Online TPP Program

#Question id: 11382

#Unit 10. Ecological Principles

Ecologist has proposed following explanation to lead biodiversity at tropic.

a) Higher productivity in the tropics allows for more species

b)  Environments are more stable and predictable in the tropics, with fairly constant temperatures and rainfall levels year-round

c) Predators and pathogens limit competition in the tropics, which allows more species to coexist

d) High evolutionary speed at tropic than temperate

TLS Online TPP Program

#Question id: 11383

#Unit 10. Ecological Principles

Following some condition are given for island.

Island P is small and near the mainland;

Island Q is small and far from the mainland;

Island R is large and near the mainland;

Island S is large and far from the mainland

Let NP, NQ, NR and NS denote the number of species on islands P, Q, R and S, respectively. Which of the following is consistent with the theory of island biogeography?

TLS Online TPP Program

#Question id: 11384

#Unit 10. Ecological Principles

Two islands, P and Q, are similar in habitat and other features. They are 100 and 200 km2 in size respectively, but have the same number of species. Which of the following statements can independently explain this observation?

(i) P is closer to the mainland than Q

(ii) P is further away from the mainland than Q

(iii) P has higher speciation rates than Q

(iv) P has lower speciation rates than Q