Cry I Ab controls
(I) Cotton bollworns .
(II) Corn borer .
(III) Bt.

Assertion: The choice of cry-gene depends upon the crop & the targeted pest Reason :Gene cry Iac & cry II Ab control the cotton bollworms while cry Iab controls corn borer

Cotton bollworms are controlled by . (I) Cry I Ac. (II) Cry II Ab (III) Cry I Ab

Match the following genes in column I with the insects that can be protected from with their coded proteins in column II. {:(,"Column I","Column II"),(,a. "cry I Ac"," (i) Cotton bollowrm"),(,b." cry I Ab " ," (ii) Beetles "),(,c. " Bt toxin gene"," (iii) Corn borer"):}

Assertion: The protein encoded by cry I Ab is not effective in control of cotton bollowrms Reason :Most Bt toxin are insect group specific

Biotechnology helped to improve the quality of human life especially in the field of . (I) Food production " " (II) Sports (III) Health " " (IV) Birth control .

Match the following figures I, and II and III (I) Hypogynous (II) Perigynous flower (III) Epigynous flower

Proteins which control cotton bollworm are produced by which Bt genes?

Read the following and answer questions from Q.1. to Q.5. given below: Plants having foreign genes in their genome through genetic engineering are called transgenic plants. Genes can be incorporated either through a vector or through direct introduction of DNA. Bt cotton is a genetically modified organism which is pestresistant. It contains gene cry I Ac and cry II Ab of Bacillus thuringiensis. It is used to control lepidopterans, coleopterans and dipterans. Bt cotton can resist cotton bollworm and produce higher yields. Cry gene produces cry protein or Bt toxin. It is an endotoxin which remains as protoxin in plants and converted to active toxin after getting ingested by the insects. Alkaline pH of the insect gut solubilizes the protein crystals, the activated toxin creates pores to the mid guts wall of theinsects which cause them to death. Cotton bollworms are killed by the protein encoded by the gene