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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

Alexander Von Humbolt described for the first time

  • Ecological Biodiversity

  • Laws of limiting factor

  • Species area relationships

  • Population Growth equation


C.

Species area relationships


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

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

B.

by secretion of pheromones

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