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 Multiple Choice QuestionsMultiple Choice Questions

51.

Hirudin is

  • a protein produced by Hordeum vulgare, which is rich in lysine

  • a toxic molecule isolated from Gossypium hirsutum, which reduces human fertility

  • a protein produced from transgenic Brassica napus, which prevents blood clotting

  • an antibiotic produced by a genetically engineered bacterium, Escherichia coli.


52.

In India, we find mangoes with different flavours, colours, fibre content, sugar content and even shelf-life. The large variation is on account of

  • species diversity

  • induced mutations

  • genetic diversity 

  • hybridisation


53.

Somaclonal variation is seen in

  • tissue culture grown plants

  • apomiets

  • polyploids

  • vegetatively propagated plants.


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54.

Cultivation of Bt cotton has been much in the news. The prefix Bt means

  • "Barium-treated" cotton seeds

  • "Bigger thread" variety of cotton with better tensile strength

  • produced by "biotechnology" using restriction enzymes and ligases 

  • carrying an endotoxin gene from Bacillus thuringienesis.


D.

carrying an endotoxin gene from Bacillus thuringienesis.

Some strains of Bacillus thuringiensis produce proteins that kill certain insects such as lepidopterans (tobacco budworm, armyworm), coleopterans (beetles) and dipterans (flies, mosquitoes). B. thuringiensis forms protein crystals during a particular phase of their growth. These crystals contain a toxic insecticidal protein.


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55.

An example of gene therapy is

  • production of injectable hepatitis B vaccine

  • production of vaccines in food crops like potatoes which can be eaten 

  • introduction of gene for adenosine deaminase in persons suffering from Severe Combined Immuno-deficiency (SCID)

  • production of test tube babies by artificial insemination and implantation of fertilized eggs


56.

Somaclonal variation can be obtained by

  • application of colchicine

  • irradiation with gamma rays

  • tissue culture

  • hybridisation.


57.

Assertion : Agrobacterium tumefaciens is popular in genetic engineering because this bacterium is associated with the roots of all cereal and pulse crops.

Reason : A gene incorporated in the bacterial chromosomal genome gets automatically transferred to the crop with which the bacterium is associated.

  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion

  • If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion

  • If Assertion is true but Reason is false.

  • If both Assertion and Reason are false.


58.

Assertion: Cattle breeds can be improved by superovulation and embryo transplantation.

Reason: Superovulation in high milk-yielding cows is induced by hormonal injection.

  • 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.


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59.

Long fibres of cotton seed are known as

  • coir

  • fuzz

  • lint

  • flax


60.

Pests which only feed and oviposit on crop are called

  • major pests

  • minor pests

  • accidental pests

  • occasional pests


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