Multiple Choice Questions

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A lake with nutrients is called

  • trophic

  • euphotic

  • oligotrophic

  • eutrophic


D.

eutrophic

Eutrophication is the process in which lakes receive nutrients such as phosphorus and nitrogen and sediment from the surrounding watershed and become more fertile and shallow.

Trophic level is the group of organisms within an ecosystem which occupy the same level in a food chain.

Euphotic zone or the sunlight zone is the uppermost layer of the ocean or lake exposed to intense sunlight.

Oligotrophic lake is a lake with low primary productivity due to low nutrient content. Also, they have low algal production.


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Bio- indicators are used for

  • oxygen demand

  • air pollution

  • mineral present

  • All of the above


RNA is not found in

  • chromosome

  • plasmalemma

  • nucleolus

  • ribosome


One gene- one enzyme hypothesis of Beadle and Tatum was experimentally proved on

  • Saccharomyces 

  • Neurospora crassa

  • Lathyrus odoratus

  • Claviceps


Nitrifying bacteria are able to

  • convert atmospheric nitrogen into soluble forms

  • convert ammonia to nitrate

  • ammonia to nitrogen

  • nitrate to nitrogen


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Study of Ecology of population is called

  • Autecology

  • Synecology

  • Ecotype

  • Demecology


Retrovirus have genetic material

  • DNA only

  • RNA only

  • DNA or RNA only

  • either DNA or RNA


Stop codons are

  • AUG, GUG

  • UAA, UGA, UAG

  • UAC, UGG

  • AGU, AGA, UAC


According to Kyoto protocol the major nations abide to reduce concentration of green house gases by

  • 2008

  • 2010

  • 2012

  • 2018


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Which of the following is not a Pyrimidine?

  • Thymine

  • Uracil

  • Guanine

  • Cytosine