Multiple Choice QuestionsOne 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 |
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.
C.
a protein produced from transgenic Brassica napus, which prevents blood clotting
Transgenic plants are those plants in which a foreign gene has been introduced and stably integrated into the host DNA. A gene that is transferred using the tools of molecular biology is called transgene.
Brassica napas is one of the transgenic plant species. Recently transgenic plants have been explored for production of biologically active peptides and proteins having pharmaceutical applications including use as blood proteins, enzymes, growth, hormones etc. The protein hirudin present in leech, prevents blood clotting. The gene was chemically synthesized and introduced in Brassica napas and later on the seeds contained the protein.
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
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