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Organisms and Populations

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

Which one of the following pairs of organisms are exotic species introduced in India?

  • ficus religiosa , lantana camara

  • lantana camara, water hyacinth

  • water hyacinth, prosopis cinereria

  • nile perch, licus religiosa


C.

water hyacinth, prosopis cinereria

A species of organisms that is not native to a locality and having been moved there from its natural range by humans or other agents is called exotic species.

A species of organisms that is not native to a locality and having been moved there from its natural range by humans or other agents is called exotic species.


Population density is denoted by the symbol
  • N
  • D
  • M
  • D

A.

N

To live in groups is beneficial because :
  • feeling of security
  • can obtain food easily
  • Partner is available for mating
  • All the above

D.

All the above

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

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

D.

Emigration

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

B.

by secretion of pheromones