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Into how many classes are the angiosperms (flowering plants) classified?

Wavelengths of light used in an optical instrument are $\lambda_1 = 4000 \ Å$ and $\lambda_2 = 5000 \ Å$. The ratio of their respective resolving powers (corresponding to $\lambda_1$ and $\lambda_2$) is:

Match the items given in Column $I$ with those in Column $II$ and select the correct option given below:
Column $I$ Column $II$
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If the standard deviation of the numbers $-1, 0, 1, k$ is $\sqrt{5}$ where $k > 0,$ then $k$ is equal to

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