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In 1926, Vavilov initially proposed eigh...

In 1926, Vavilov initially proposed eight main geographic centres of crop origin. Mention any six of them.

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China, India, South America, Mediterranean, Mesoamerica and South East Asia.
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Knowledge Check

  • Vavilov has given _____ main centres of origin of plants.

    A
    7
    B
    9
    C
    8
    D
    10

  • (I) World's first cotton hybrid is developed by N.G.P. Rao. (II) Zhukovsky put forward the concept of mega gene centre for the cultivated species. (III) C.T Patel developed world's first hybrid of sorghum. (IV) Vavilov proposed 8 main geographic centres.

    A
    I, II and III only
    B
    I and II only
    C
    II and IV only
    D
    II, III and IV only

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    Procedure : (i) Draw three circles of any radius with centre O on chart paper. (ii) From these circles, cut a semi - circle, a minor segment and a major segment (iii) Consider three points on these segment and name them as A,B, and C (iv) Cut the triangles and paste it the graph sheet so that the point A coincides with the origin as shown in the figure. Ovservation : (i) Angle in a Semi - Circle is . . . . . . . . . . angle. (ii) Angle in a major segment is angle. (iii) Angle in minor segment is . . . . . . . angle.

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