On what basis are the three types of lichens classified?

$\int \frac{1+\cos 4 x}{\cot x-\tan x} d x$ is equal to

The major product of the following reaction is

Tetrarch vascular bundles are found in .......

Isogamous condition with non-flagellated gametes is found in:

The resistance of a bulb filament is $100\, \Omega$ at a temperature of $100\, ^oC$. If its temperature coefficient of resistance is $0.005\, (^oC)^{-1}$,at what temperature will its resistance become $200\, \Omega$?