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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

Some hyperthermophilic organisms that grow in highly acidic (pH2) habitats belongs to the two groups called

  • eubacteria and archaea

  • cyanobacteria and diatoms

  • protists and mosses

  • liverworts and yeasts


A.

eubacteria and archaea

Thermophiles live in hot places, typically from 60o to 80oC. Many thermophiles (some eubacteria and archaebacteria) are autotrophs and have metabolisms based on sulphur. Some thermophilic archaebacteria form the basis of food webs around deep- sea thermal vents, where they must withstand extreme temperature and pressure. Archaebacteria can grow in highly acidic (pH = 0.7) and very basic (pH= 11) environments.

Thermophiles live in hot places, typically from 60o to 80oC. Many thermophiles (some eubacteria and archaebacteria) are autotrophs and have metabolisms based on sulphur. Some thermophilic archaebacteria form the basis of food webs around deep- sea thermal vents, where they must withstand extreme temperature and pressure. Archaebacteria can grow in highly acidic (pH = 0.7) and very basic (pH= 11) environments.


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

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

B.

by secretion of pheromones

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

A.

N

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

D.

Emigration

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