The following statements are made regarding volatile compounds of plant;

a) secondary metabolites also fuction in defence mechanism but this is not the volatile compound

b) These volatiles can act as cues for natural enemies of the insect herbivore such as parasitic wasps

c) All plants releases green-leaf volatiles in response to mechanical damage that is a mixture of aldehydes, alcohols, and esters

d) These volatiles attracts natural enemies of the attacking insect herbivores—predators or parasites

Which one of the following options represents a combination of correct statements?

TLS Online TPP Program

#Question id: 12550

#Unit 10. Ecological Principles

In order to construct a reproductive table for a sexual species, you need to

TLS Online TPP Program

#Question id: 12551

#Unit 10. Ecological Principles

Which of the following examples would most accurately measure the density of the population being studied? 

TLS Online TPP Program

#Question id: 12552

#Unit 10. Ecological Principles

To measure the population of lake trout in a 250 hectare lake, 200 individuals were netted and marked with a fin clip, and then returned to the lake. The next week, the lake is netted again, and out of the 200 lake trout that are caught, 50 have fin clips. Using the capture-recapture estimate, the lake trout population size could be closest to which of the following?

TLS Online TPP Program

#Question id: 12553

#Unit 10. Ecological Principles

Which of the following assumptions have to be made regarding the capture -recapture estimate of population size?

I. Marked and unmarked individuals have the same probability of being trapped.

II.    The marked individuals have thoroughly mixed with population after being marked.

III.  No individuals have entered or left the population by immigration or emigration, and no individuals have been added by birth or eliminated by death during the course of the estimate.

TLS Online TPP Program

#Question id: 12554

#Unit 10. Ecological Principles

Long-term studies of Belding's ground squirrels show that immigrants move nearly 2 km from where they are born and make up 1 to 8% of the males and 0.7 to 6% of the females in other populations. On an evolutionary scale, why is this significant?

TLS Online TPP Program

#Question id: 12555

#Unit 10. Ecological Principles

Demography is the study of