Which of the following is a method of plant tissue culture?

$A$ particle moves along the curve $y=x^2+2x$. The point on the curve such that the $x$ and $y$ coordinates of the particle change at the same rate is

Which of the following equilibria will shift to the right side on increasing the temperature?

The number of moles of electrons required to deposit $36 \ g$ of $Al$ from an aqueous solution of $Al(NO_3)_3$ is (At. wt. of $Al = 27$)

The equation $\frac{1}{r} = \frac{1}{8} + \frac{3}{8} \cos \theta$ represents

$50 \ \Omega$ and $100 \ \Omega$ resistors are connected in series. This connection is connected with a battery of $2.4 \ V$. When a voltmeter of $100 \ \Omega$ resistance is connected across the $100 \ \Omega$ resistor,the reading of the voltmeter will be $.......... \ V$.