Which of the following hormones does not naturally occur in plants?

During which phase of mitosis do the nuclear envelope and nucleolus completely disappear?

Accumulation of which of the following molecules in the muscles occurs as a result of vigorous exercise?

An inverted bell lying at the bottom of a lake $47.6 \, m$ deep has $50 \, cm^3$ of air trapped in it. The bell is brought to the surface of the lake. The volume of the trapped air will be ......... $cm^3$ (atmospheric pressure $= 70 \, cm$ of $Hg$ and density of $Hg = 13.6 \, g/cm^3$).

If $ax^2-34xy-5y^2+2x+26y-5=0$ represents a pair of straight lines,then the value of $a$ is

Which one of the following gives a yellow precipitate with iodine and $NaOH$ solution?