Which hormone stimulates the development of the corpus luteum?

The set of all solutions of the inequation $x^2 - 2x + 5 \leq 0$ in $R$ is

The disease known as fluorosis is caused by the reaction of fluorine with which of the following?

If $y = \sec(\tan^{-1} x)$,then $\frac{dy}{dx}$ at $x = 1$ is equal to

$A$ particle of mass $1 \times 10^{-26} \ kg$ and charge $1.6 \times 10^{-19} \ C$ travelling with a velocity $1.28 \times 10^6 \ ms^{-1}$ along the positive $X$-axis enters a region in which a uniform electric field $E$ and a uniform magnetic field of induction $B$ are present. If $E = -102.4 \times 10^3 \ \hat{k} \ NC^{-1}$ and $B = 8 \times 10^{-2} \ \hat{j} \ Wbm^{-2}$,the direction of motion of the particle is:

In which plant group are the sporophylls arranged spirally along an axis to form distinct compact structures called strobili or cones?