Multiple Choice Questions

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Emasculation ensures cross-pollination in

  • staminate flower

  • bisexual flower

  • neuter flower

  • pistillate flower


B.

bisexual flower

Emasculation is the technique in plant breeding for crop improvement programmes. It involves the removal of anthers from bisexual flowers buds of the female parents before the anther dehisces by means of a pair of forceps in order to avoid self or cross-pollination. However, if a female parent produces unisexual flowers there is no requirement for emasculation.


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Formation of polysome does not require

  • rRNA

  • mRNA

  • tRNA

  • snRNA


The concept of hot- spot was first introduced by

  • Mayer

  • Simpson

  • Myers

  • David


Industrial melanism is an

  • effect of industrial pollution

  • effect of mutation

  • evidence of survival of fittest

  • evidence of favour of natural selection


Insect pest resistant Bt cotton plant was developed using

  • somaclonal variation

  • micropropagation

  • somatic hybridisation

  • Transgenic technology


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'Kyoto Protocol' is a multination international treaty for

  • phasing out green house gases

  • controlling ozone destroying substances

  • management of hazardous wastes

  • conservation of biodiversity


Intermediate host of malarial parasite is

  • pig

  • man

  • mosquito

  • larva of mosquito


With the rise of water temperature, dissolved oxygen

  • remains unchanged

  • increases in amount

  • decreases in amount

  • is more available to the aquatic organisms


Which codon is not an indicator of completion of protein synthesis?

  • UAG

  • AUG

  • UAA

  • UGA


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Genes which are located only in the X-chromosome are known as

  • epistasis genes

  • holandric genes

  • operator genes

  • antiepistasis genes