Some nonnative parasites are introduced deliberately for the biological control of pests, which of the following are necessary attributes of a good agent of biological control?

a. low rate of increase relative to the host’s

b. Good dispersal ability

c. High searching capacity for hosts

d. Minimal time lag effects

e. Maximal time lag effect

f. General adaptability to the environment

TLS Online TPP Program

#Question id: 29063

#Unit 10. Ecological Principles

Which of the following statement correct define the Proportional similarity values ?

a) less than 0.70 have been taken to indicate competitive exclusion

b) greater than 0.70 indicate possible coexistence

c) less than 0.70 have been taken to indicate possible coexistence

d) greater than 0.70 indicate competitive exclusion

TLS Online TPP Program

#Question id: 29064

#Unit 10. Ecological Principles

Regarding the geographic range of a species, which of the following statements is true?

TLS Online TPP Program

#Question id: 29065

#Unit 10. Ecological Principles

Ecological and crude density of fish prey in related with predator. Water level is drop during the dry season and further increases in a rainy season. Following some observation effect are present on their density

A) Ecological density is not change with respect to water level       

B) Ecological density is gradually decrease with low water level

C) Crude density increases over ecological density during low water level             

D) Ecological density increases while crude density decreases during low water level

E) There is no effect on crude density with seasonal water level

Which of the following above observation is correct?

TLS Online TPP Program

#Question id: 29066

#Unit 10. Ecological Principles

What will have not the drawbacks of Mark-recapture technique ?

TLS Online TPP Program

#Question id: 29067

#Unit 10. Ecological Principles

Which of the following statements about the birth rates (b1, b2) and death rates (d1, d2) of species 1 and 2 indicated in the figure is true?

TLS Online TPP Program

#Question id: 29068

#Unit 10. Ecological Principles

A positive correlation between population density over time and individual fitness is known as___