Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

71.

Study of Ecology of population is called

  • Autecology

  • Synecology

  • Ecotype

  • Demecology


D.

Demecology

Demecology is a group of individuals of the same species that live in the same area.

Autecology deals with the biological relationship between an individual organism or an individual species and its environment.

Synecology deals with the distribution, abundance and interaction of living organisms at the level of communities, populations and ecosystems.

Ecotype is a distinct form or race of a plant or animal species occupying a particular habitat.


72.

Retrovirus have genetic material

  • DNA only

  • RNA only

  • DNA or RNA only

  • either DNA or RNA


B.

RNA only

Retrovirus is a RNA virus which infects animal cells and replicates by first converting to dsDNA with the help of enzymereverse transcriptase. Retroviruses are enveloped viruses. AIDS is caused by HIV III (Human Immunodeficiency Virus), which is also a retrovirus.


73.

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.


74.

Stop codons are

  • AUG, GUG

  • UAA, UGA, UAG

  • UAC, UGG

  • AGU, AGA, UAC


B.

UAA, UGA, UAG

UAG,UAA,UGA are three stop codons or non- sense codons. They do not code for any amino acid.

AUG works as an initiation codon in both prokaryotes and eukaryotes. In rare cases,GUG is used as an initiation codon in bacterial protein synthesis.

AUG is used to code for tyrosine, UGG codes for tryptophan,AGU codes for serine andAGAcodes for argenine.


75.

Bio- indicators are used for

  • oxygen demand

  • air pollution

  • mineral present

  • All of the above


D.

All of the above

Any organism which can be used to characterize particular environmental properties is calledBiological indicator,eg, pollution oxygenation.


76.

RNA is not found in

  • chromosome

  • plasmalemma

  • nucleolus

  • ribosome


B.

plasmalemma

RNA is not found in plasmalemma. It is the cell membrane which also lines the connecting plasmodesmata.


77.

Nitrifying bacteria are able to

  • convert atmospheric nitrogen into soluble forms

  • convert ammonia to nitrate

  • ammonia to nitrogen

  • nitrate to nitrogen


B.

convert ammonia to nitrate

Most of the ammonia produced in the soil is acted upon by nitrifying bacteria. Ammonia is changed to nitrate. The reaction occurs in two steps nitrite formation (eg, Nitrosomonas) and nitrate formation (eg, Nitrobacter).


78.

Which of the following is not a Pyrimidine?

  • Thymine

  • Uracil

  • Guanine

  • Cytosine


C.

Guanine

The nitrogenous bases are of two types:

(a) Pyrimidine base- cytosine, thymine

(b) Purine base- adenine, guanine

These nitrogenous bases are found in DNA/ RNA. Uracil is found in RNA in place of thymine.


79.

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

  • Saccharomyces 

  • Neurospora crassa

  • Lathyrus odoratus

  • Claviceps


B.

Neurospora crassa

One gene- one enzyme theory was given byBeadleandTatum in 1958, while they were working on red mould orNeurospora crassa (Ascomycetes fungus), which is also calledDrosophila of plant kingdom.


80.

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

  • 2008

  • 2010

  • 2012

  • 2018


C.

2012

International conference held in Kyoto, Japan obtained commitments from different, countries for reducing overall green house gas emissions at a level 5% below 1990 level by 2008-2012.