What is common between chloroplasts,chromoplasts and leucoplasts?

The line $2x + \sqrt{6}y = 2$ is a tangent to the curve $x^2 - 2y^2 = 4$. The point of contact is

Which one of the following orders is correct for the bond dissociation energies of halogen molecules?

$Assertion\,(A):$ Audio signal of frequency $10 kHz$ cannot be transmitted over long distance without modulation.

$Reason\,(R):$ Length of the antenna required $\lambda /$, should have practical value.

Dividing the interval $[0,6]$ into $6$ equal parts and by using the trapezoidal rule, the value of $\int_0^6 x^3 dx$ is approximately:

$A$ circular disc of radius $R$ is removed from a bigger circular disc of radius $2R$ such that the circumferences of the discs touch. The centre of mass of the new disc is at a distance $\alpha R$ from the centre of the bigger disc. The value of $\alpha$ is