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The departure of a individual from a population is called :
  • Natality 
  • Mortality
  • Immigration 
  • Emigration


D.

Emigration
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Ants give information to their companions :
  • by dancing
  • by secretion of pheromones
  • by making sound
  • by defecating

B.

by secretion of pheromones
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Population density is denoted by the symbol
  • N
  • D
  • M
  • D

A.

N
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The number of births during a given period in the
population that are added to the initial density is 

 :
  • Natality
  • Mortality
  • Migration
  • Immigration

A.

Natality
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In which interaction only one species is benefitted while the other species is neither harmed nor benefitted ?
  • Parasitism
  • Predation
  • Both (A) and (B)
  • commenalism

D.

commenalism
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