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What is a centromere? How does the posit...

What is a centromere? How does the position of centromere form the basis of clasification of chromosomes. Support your answer with a diagram showing the position of centromere on different types of chromosomes.

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Analyse the observation table which shows variation of image distance [v] with object distance [u] in the case of a convex lens. Answer the questions that follow without doing any calculations. {:("Sl.No","Object distance","Image distance"),(,"u [cm]","v [cm]"),(1,-90,+18),(2,-60,+20),(3,-30,+30),(4,-20,+60),(5,-18,+90),(6,-10,+100):} (a) What is the focal length of the convex lens ? Given reasons to support your answer. (b) Write the Sl.No of the observation which is not correct. How did you arrive at this conciusion ? (c ) Use an appropriate scale to draw the ray diagram for the observation at Sl. No 4 and find the approximate value of magnification.