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Standard XII
Biology
What Are Transgenic Organisms?
Question

Which one of the following is a correct statement?
  1. Bt in Bt-cotton indicates that it is a genetically modified organism produced through biotechnology.
  2. Somatic hybridization involves fusion of two complete plant cells carrying desired genes.
  3. The anticoagulant hirudin is being produced from transgenic, Brassica napus seeds.
  4. Flavr Savr variety of tomato has enhanced the production of ethylene which improves its taste.

A
Somatic hybridization involves fusion of two complete plant cells carrying desired genes.
B
The anticoagulant hirudin is being produced from transgenic, Brassica napus seeds.
C
Flavr Savr variety of tomato has enhanced the production of ethylene which improves its taste.
D
Bt in Bt-cotton indicates that it is a genetically modified organism produced through biotechnology.
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Solution
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Brassica napus gene is responsible for the production of hirudin anticoagulant protein.
Bt cotton is a genetically modified variety of cotton producing an insecticide. Bt indicates the bacterium, Bacillus thuringiensis.
The process by which protoplasts of two different plant species fuse together to form hybrids is known as somatic hybridisation.
A genetically modified tomato, or transgenic tomato is a tomato that has had its genes modified, using genetic engineering. The first commercially available genetically modified food was a tomato engineered to have a longer shelf life (the Flavr Savr).
Thus, the correct answer is option C.

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Similar Questions
Q1
Study the following statements and select the incorrect ones.

(i) 'Bt' in 'Bt cotton' indicates that is a genetically modified crop produced through biotechnology.
(ii) The anticoagulant 'hirudin' is being produced from transgenic Brassica napus seeds.
(iii) 'Flavr Savr' transgenic tomatoes remain fresh for a longer period than the normal tomato variety.
(iv) Golden rice is a transgenic variety of Oryza sativa, which is rich in β-carotene and helps to prevent night blindness.

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Q2
Assertion: Flavr Savr is a genetically modified tomato which remains fresh for a long time
Reason: Production of polygalacturonase is blocked in FLAVR SAVR
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Q3

Biotechnology through genetic engineering has made it possible to modify organisms and produce new varieties by manipulating the genes. Which of the following is the scope of biotechnology with this approach?


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Q4
Pick the incorrect statements among the following:
(i) Bt brinjal is the first transgenic crop commercially available in India.
(ii) Genetically modified plants are produced by modifying the DNA of a plant, thus giving it new characteristics.
(iii) Bt cotton, Bt brinjal, golden rice are some examples of transgenic crops.
(iv) A toxin gene from Bacillus thuringiensis bacteria was transferred to cotton plant.
(v) Transgenic plants increased efficiency of mineral usage by plants.
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Q5
The transgenic plant 'Flavr Savr' tomato carries an artificial gene for
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