'Barr body' is derived from
1). autosomes in males
2). autosomes in females
3). X-chromosome in female
4). X-chromosome in males
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3. The acid which is secreted by the glands in the stomach wall is
4. Which one of the following lenses should be used to correct the defect of astigmatism ?
5. An example of replenshible energy source is
6. The major harmful gas emitted by automobile vehicle which causes air pollution is
7. Fibre optics work on the principle of
8. Which one of the following metals pollutes the air of a city having large number of automobiles?
9. A parachute descends slowly whereas a stone dropped from the same Height falls rapidly because