Select the correct statement from the following: from Biology Organisms and Populations Class 12 Nagaland Board
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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

Select the correct statement from the following:

  • Darwinian variations are small and directionless

  • Fitness is the end result of the ability to adapt and gets selected by nature

  • All mammals except whales and camels have seven cervical vertebrae

  • Mutations are random and directional


B.

Fitness is the end result of the ability to adapt and gets selected by nature

Fitness (survival of the fittest) is a result of selection and proliferation of only those organisms which were most suitably adapted to the environment and get selected by nature.

Fitness (survival of the fittest) is a result of selection and proliferation of only those organisms which were most suitably adapted to the environment and get selected by nature.

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

A.

N
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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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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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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
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