CBSE Class 12 Biology Biotechnology and Its Applications MCQs Set B

Question. What triggers the activation of protoxin to active toxin of Bacillus thuringiensis in boll worm?
(a) Acidic pH of stomach
(b) Body temperature
(c) Moist surface of midgut
(d) Alkaline pH of gut

Answer : D

Question. In RNAi, the genes are silenced using
(a) dsRNA
(b) ssDNA
(c) ssRNA
(d) dsDNA.

Answer : A

Question. Which of the following Bt crops is being grown in India by the farmers?
(a) Brinjal
(b) Soybean
(c) Maize
(d) Cotton

Answer : D

Question. Bt brinjal is an example of transgenic crops. In this, Bt refers to
(a) Bacillus tuberculosis
(b) biotechnology
(c) b-carotene
(d) Bacillus thuringiensis.

Answer : D

Question. Maximum number of existing transgenic animals is of
(a) fish
(b) mice
(c) cow
(d) pig.

Answer : B

Question. Select the correct statement(s)-
(1) IARI has released a mustard variety rich in vitamin C.
(2) Pusa Sawani variety of Okra is resistant to aphids.
(3) Hairiness of leaves provides resistance to insect pests.
(4) Agriculture accounts for approximately 33% of India’s GDP and employs nearly 62% of the population.
(a) (1) and (2)
(b) (2) and (3)
(c) (1), (3) and (4)
(d) None of these

Answer : C

Question. Which part of the tobacco plant is infected by Meloidogyne incognita?
(a) Stem
(b) Root
(c) Flower
(d) Leaf

Answer : B

Question. The first transgenic crop was
(a) tobacco
(b) cotton
(c) pea
(d) flax.

Answer : A

Question. Which kind of therapy was given in 1990 to a four-year-old girl with adenosine deaminase (ADA) deficiency?
(a) Gene therapy
(b) Chemotherapy
(c) Immunotherapy
(d) Radiation therapy

Answer : A

Question. Identify the incorrect statement regarding Bt cotton.
(a) Dried spores of Bacillus thuringiensis are sprayed on its vulnerable leaves.
(b) It releases toxin that causes swelling in the gut of insect that ingest its leaves.
(c) It is a transgenic plant.
(d) It can produce toxin due to gene introduced in it by transgenesis.

Answer : A

Question. A probe which is a molecule used to locate specific sequences in a mixture of DNA or RNA molecules could be
(a) a single stranded RNA
(b) a single stranded DNA
(c) either RNA or DNA
(d) can be ss-DNA but not ss RNA

Answer : C

Question. The site of production of ADA in the body is
(a) bone marrow
(b) lymphocytes
(c) blood plasma
(d) monocytes

Answer : B

Question. In India, the organisation responsible for assessing the safety of introducing genetically modified organisms for public use is
(a) Indian Council of Medical Research (ICMR)
(b) Council for Scientific and Industrial Research (CSIR)
(c) Research Committee on Genetic Manipulation (RCGM)
(d) Genetic Engineering Approval Committee (GEAC).

Answer : D

Question. Use of bioresources by multinational companies and organisations without authorisation from the concerned country and its people is called
(a) bio-infringement
(b) biopiracy
(c) biodegradation
(d) bioexploitation.

Answer : B

Question. Which one of the following is a correct statement?
(a) 'Bt' in “Bt-cotton” indicates that it is a genetically modified organism produced through biotechnology.
(b) Somatic hybridization involves fusion of two complete plant cells carrying desired genes.
(c) The anticoagulant ‘hirudin’ is being produced from transgenic Brassica napus seeds.
(d) “Flavr Savr” variety of tomato has enhanced the production of ethylene which improves its taste

Answer : C

Question. What is antisense technology?
(a) When a piece of RNA that is complementary in sequence is used to stop expression of a specific gene
(b) RNA polymerase producing DNA
(c) A cell displaying a foreign antigen used for synthesis of antigens
(d) Production of somaclonal variants in tissue cultures

Answer : A

Question. Bacillus thruingiensis (Bt) strains have been used for designing noble:
(a) Biofertilizers
(b) Biometallurgical techniques
(c) Biomineralization processes
(d) Bioinsecticidal plants

Answer : A

Question. A transgenic food crop which may help in solving the problem of night blindness in developing countries is
(a) golden rice
(b) Bt soyabean
(c) flavr – savr tomato
(d) starlink maize

Answer : A

Question. A pro-toxin is
(a) a primitive toxin
(b) a denatured toxin
(c) toxin produced by protozoa
(d) inactive toxin

Answer : D

Question. Which body of the Government of India regulates GM research and safety of introducing GM organisms for public services.
(a) Bio-safety committee
(b) Indian council of Agricultural Research
(c) Genetic Engineering Approval committee
(d) Research Committee on Genetic Manipulation.

Answer : C

Question. Some of the characteristics of Bt cotton are
(a) long fibre and resistance to aphids
(b) medium yield, long fibre and resistance to beetle pests
(c) high yield and production of toxic protein crystals which kill dipteran pests
(d) high yield and resistance to bollworms.

Answer : D

Question. cryIIAb and cryIAb produce toxins that control
(a) cotton bollworms and corn borer respectively
(b) corn borer and cotton bollworms respectively
(c) tobacco budworms and nematodes respectively
(d) nematodes and tobacco budworms respectively

Answer : A

Question. How many varieties of rice has been estimated to be present in India?
(a) 2,000
(b) 20,000
(c) 200,000
(d) 2,000,000

Answer : C

Question. Bt toxins are
(a) intracellular lipids 18.
(b) intracellular crystalline proteins
(c) extracellular crystalline proteins
(d) intracellular polysaccharides

Answer : B

Question. Bt brinjal is an example of transgenic crops. In this, Bt refers to
(a) Bacillus tuberculosis
(b) biotechnology
(c) b-carotene
(d) Bacillus thuringiensis.

Answer : D

Question. Transgenic animals are extensively used for all of the following procedures except
(a) bioremediation
(b) chemical safety
(c) vaccine safety
(d) toxicity test.

Answer : A

Question. In India, the organisation responsible for assessing the safety of introducing genetically modified organisms for public use is
(a) Indian Council of Medical Research (ICMR)
(b) Council for Scientific and Industrial Research (CSIR)
(c) Research Committee on Genetic Manipulation (RCGM)
(d) Genetic Engineering Appraisal Committee (GEAC).

Answer : D

Question. Which of the following Bt crops is being grown in India by the farmers?
(a) Brinjal
(b) Soybean
(c) Maize
(d) Cotton

Answer : D

Question. A ‘new’ variety of rice was patented by a foreign company, though such varieties have been present in India for a long time. This is related to
(a) Co-667
(b) Sharbati Sonora
(c) Lerma Rojo
(d) Basmati.

Answer : D

Question. Which of the following genes do not occur naturally in living organisms?
(a) Bt genes
(b) RNAi genes
(c) Cry genes
(d) Endogenous cytoplasmic defense genes

Answer : D

Question. First Transjenic crop was :
(a) Cotton
(b) Alsi
(c) Pea
(d) Tobacco

Answer : D

Question. Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to
(a) insect pests
(b) fungal diseases
(c) plant nematodes
(d) insect predators.

Answer : A

Question. Toxsin is :
(a) Intracellular lipid
(b) Intracellular crystal protein
(c) Extracellular Crystal protein
(d) Lipid

Answer : B

Question. Natural genetic engineer is :
(a) Bacillus subtilis
(b) Pseudomonas sp.
(c) Escherichia coli
(d) Agrobacterium tumefaciens

Answer : A