In Whittaker's classification system,which kingdom acts as the primary producer?

From which plant did $D.J. Ivanowsky$ discover viruses?

Which of the following is not tetrahedral?

$\int \frac{x^8-9 x^2+18}{x^4-3 x^2+3} d x=$

For a constant hydraulic stress on an object,the fractional change in the object's volume $\left( \frac{\Delta V}{V} \right)$ and its bulk modulus $(B)$ are related as

If the lines $2x + 3y + 12 = 0$ and $x - y + k = 0$ are conjugate with respect to the parabola $y^2 = 8x$,then $k$ is equal to