Biotechnology and Its Applications

Which organism is used to transfer T-DNA

• Streptomyces hygroscopicus

• Agrobacterium tumefaciens

• Salmonella typhi

• Escherichia coli

Which of the following represents the action of insulin?

• Increases blood glucose level by stimulating glucagon production

• Decreases blood glucose level by forming glycogen

• Increases blood glucose level by promoting cellular uptake of glucose

• Increases blood glucose level by hydrolysis of glycogen

Assertion: GM foods are facing widespread resistance by the people.

Reason: GM foods have mutated genes which cause infections and allergies.

• If both assertion and reason are true and reason is the correct explanation of assertion. 

• If both assertion and reason are true but reason is not the correct explanation of assertion. 

• If assertion is true but reason is false. 

• If both assertion and reason are false.

The number of chromosomes present in the cells of the bread wheat, Triticum aestivum suggests that it is

• hexaploid

• diploid

• tetraploid

• pentaploid

Assertion : The technique of micropropogation has been used to introduce variations in the offspring.

Reason : It is not possible to generate virus free plants by micropropogation.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false

• If both assertion and reason are false

Somaclones are prepared by

• callus culture

• sexual reproduction

• micropropagation

• somatic hybridisation

Genetically modified (GM) crops can be produced by

• recombinant DNA technology

• somatic hybridization

• cross breeding

• micropropogation

What is true about Bt toxin

• Bt protein exists as active toxin in the Bacillus.

• The activated toxin enters the ovaries of the pest to sterilise it and thus prevent its multiplication.

• The concerned Bacillus has antitoxins.

• The inactive protoxin gets converted into active form in the insect gut

Wine and beer are produced directly by fermentation whereas brandy and whisky require both fermentation and distillation. This is because

• fermentation is inhibited at an alcohol level of 10-18%

• distillation prolongs storage

• distillation improves quality

• distillation purifies the beverage.

Assertion: GM crops can affect human health by causing allergic reactions.

Reason: Transgenes in commercial crops can endanger native species e.g., the Bt toxin gene expressed in pollen might endanger pollinators like honeybees.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.