Which of the following hormones is used to induce callus formation from shoot tips?

At $27^{\circ} C$,$500 \ mL$ of helium diffuses in $30 \ minutes$. What is the time (in hours) taken for $1000 \ mL$ of $SO_2$ to diffuse under the same experimental conditions?

Which one of the following hormones,though synthesized elsewhere,is stored and released by the master gland?

$A$ container is filled with water $(\mu = 1.33 \approx 4/3)$ up to a height of $33.25 \, cm$. $A$ concave mirror is placed $15 \, cm$ above the water level. The image of an object placed at the bottom is formed by the mirror at $25 \, cm$ below the water level. The focal length of the mirror is: (in $, cm$)

The phase difference between input and output voltage of a $CE$ circuit is.......$^o$

Name the gas that can readily decolourise acidified $KMnO_4$ solution.