One of the major difficulties in the biological control of insect pest is that

• the predator develops a preference to other diets and may itself become a pest

• the predator does not always survive when transferred to a new environment

• the method is less effective as compared with the use of insecticides

• the practical difficulty of introducing the predator to specific areas.

In transgenics, expression of transgene in target tissue is determined by

• enhancer

• transgene

• promoter

• reporter.

In the following table identify the correct matching of the crop, its disease and the corresponding pathogen.

• Crop	Disease	Pathogen
  Citrus	Canker	Pseudomonas rubrilineans

• Potato

  Late blight

  Fusarium udum

• Brinjal

  Root-knot

  Meloidogyne incognita

• Pigeon

  pea Seed gall

  Phytophthora infestans

164.

Which one of the following is a correct statement?

• "Bt" in "Bt-cotton" indicates that it is a genetically modified organism produced through biotechnology

• Somatic hybridization involves fusion of two complete plant cells carrying desired genes.

• The anticoagulant hirudin is being produced from transgenic Brassica napus seeds.

• "Flavr Savr" variety of tomato has enhanced the production of ethylene which improves its taste.

In which one of the following combinations (a-d) of the number of chromosomes is the present day hexaploid wheat correctly represented

• Combination	­ Mono­soic	Haploid	Nullisomic	Trisomic
  (a)	21	28	42	43

• (b)

  7

  28

  40

  42

• (c)

  21

  7

  42

  43

• (d)

  41

  21

  40

  43

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.

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

Somaclonal variation is seen in

• tissue culture grown plants

• apomiets

• polyploids

• vegetatively propagated plants.

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.

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