Free NEET Biology multiple-choice questions on Applications in Agriculture. Attempt each question and reveal the answer with a full explanation.
The Bt toxin is effective against certain insects like the tobacco budworm and the armyworm. To which specific insect order do these pests belong? Lepidopterans Coleopterans Dipterans Hymenopterans The bacterium Bacillus thuringiensis is widely used in contemporary biology as - Source of industrial enzyme Indicator of water pollution Insecticide Agent for production of dairy products What is true about Bt toxin ? The concerned Bacillus has antitoxins The inactive protoxin gets converted into active form in the insect gut Bt protein exists as active toxin in the Bacillus The activated toxin enters the ovaries of the pest to sterillise it and thus prevent its multiplication. Which of the following Bt crops is being grown in India by the farmers? Maize Cotton Brinjal Soybean Which part of the tobacco plant is infected by Meloidogyne incognita ? Flower Leaf Stem Root What is the meaning of Bt in Bt cotton ? Cotton seeds carrying and endotoxin gene from Bacillus thuringiensis against pink boll-worm Baculovirus treated cotton seeds against pink boll-worm Bigger thread of disease resistant cotton with better tensile strength. Cotton produced by Biotechnology using restriction Enzyme and Ligases to resist microbial infection What triggers activation of protoxin to active Bt toxin of Bacillus thuringiensis in boll worm? Acidic pH of stomach Body temperature Moist surface of midgut Alkaline pH of gut Which of the following is true for Golden rice? It has yellow grains, because of a gene introduced from a primitive variety of rice It is Vitamin A enriched, with a gene from daffodil It is pest resistant, with a gene from Bacillus thuringiensis It is drought tolerant, developed using Agrobacterium vector Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to Fungal diseases Plant nematodes Insect predators Insect pests The toxin proteins isolated from Bacillus thuringiensis, coded by which of the following genes would control cotton bollworms and corn borer, respectively? cryIAc and cryIIAb cryIAc and cryIIIAb cryIAc and cryIAb cryIIAb and cryIAc Which transgenic plant was the first to be used for the commercial production of the anticoagulant protein 'Hirudin'? Brassica napus Nicotiana tabacum Oryza sativa Arabidopsis thaliana Bt cotton variety that was developed by the introduction of toxin genes of Bacillus thuringiensis (Bt) is resistant to: Insect pests Fungal diseases Plant nematodes Salt stress Why must the Bt toxin be ingested by the insect to become lethal? The alkaline pH of the insect gut solubilizes the crystals The acidic pH of the insect gut activates the protoxin The insect's saliva contains enzymes that activate the toxin The toxin only binds to external chitinous layers Which one of the following is being utilized as a source of biodiesel in the Indian countryside? betroot sugarcane pongamia euphorbia In vitro clonal propagation in plants is characterized by :- PCR and RAPD Northern blotting Electrophoresis and HPLC Microscopy Given below are two statements: Statement I : Bt toxins are insect group specific and coded by a gene cry IAc. Statement II : Bt toxin exists as inactive protoxin in B. thuringiensis . However, after ingestion by the insect the inactive protoxin gets converted into active form due to acidic pH of the insect gut. In the light of the above statements, choose the correct answer from the options given below: Both Statement I and Statement II are true Both Statement I and Statement II are false Statement I is true but Statement II is false Statement I is false but Statement II is true The inactive form of Bt toxin is converted to the active form in the insect gut due to alkaline pH due to acidic pH by proteases by nucleases 'Golden Rice' is a transgenic variety of rice ( Oryza sativa ) which is enriched in: Ì' -carotene Vitamin C Iron Essential amino acids Which part of the tobacco plant is infected by Meloidogyne incognita? Roots Leaves Stem Flowers Golden rice is a genetically modified crop plant where the incorporated gene is meant for biosynthesis of: Vitamin A Vitamin B Vitamin C Omega 3 Golden rice is a transgenic crop of the future with the following improved trait - High protein content High vitamin – A content High lysine (essential amino acid) content Insect resistance Bacillus thuringiensis (Bt) strains have been used for designing novel - Bioinsecticidal plants Bio-mineralization processes Biofertilizers Bio-metallurgical techniques Golden rice is a promising transgenic crop. When released for cultivation, it will help in Alleviation of vitamin A deficiency Pest resistance Herbicide tolerance Producing a petrol-like fuel from rice Which of the following plant species you would select for the production of bioethanol ? Jatropha Brassica Zea Mays Pongamia