Methanogens belong to $..........$.

The angle between the lines represented by $y^2 \sin^2 \theta - xy \sin^2 \theta + x^2(\cos^2 \theta - 1) = 0$ is

Which one of the following ions exhibits the highest magnetic moment?

Which type of primary xylem is present in the given figure?

In dicot stem,vascular bundles are

For preparing a $0.1 \ N$ solution of a compound from its impure sample of which the percentage purity is known,the weight of the substance required will be