SSC General Science & Technology Sample Paper NCERT Sample Paper-7

  • question_answer
    Study the following statements
    1. In Btcotton, a transgenic plant, Btrefers to Bacillus thuringiensis.
    2. Natural genetic engineer is Agrobacterium tumefaciens.
    3. In bacteria, plasmid is a extra chromosomal material. Which of the statement(s) given above is/are true?

    A)  Only 1 

    B)  Only 2

    C)  2 and 3

    D)  1, 2 and 3

    Correct Answer: D

    Solution :

    [d] Bacillus thuringiensis (or Bt) is a Gram-positive, soil-dwelling bacterium, commonly used as a biological pesticide. B. thuringiensis also occurs naturally in the gut of caterpillars of various types of moths and butterflies, as well on leaf surfaces, aquatic environments, animal feces, insect-rich environments, and flour mills and grain-storage facilities. Strains of the bacterium Bacillus thuringiens is produce over 200 different Bt toxins, each harmful to different insects. Most notably, Bt toxins are insecticidal to the larvae of moths and butterflies, beetles, cotton bollwormsand ghtu flies but are harmless to other forms of life.

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