Which of the following is not a macromolecule?

Leaves that produce microspores and megaspores are called:

$A$ man is standing on a balance and his weight is measured. If he takes a step in the left side,then his weight

When a battery is connected across a resistor of $16 \Omega$,the voltage across the resistor is $12 \ V$. When the same battery is connected across a resistor of $10 \Omega$,the voltage across it is $11 \ V$. The internal resistance of the battery in ohm is

The main structural component of a virus is:

$A$ tiny air bubble in a glass slab $(\mu = 1.5)$ appears from one side to be $6\, cm$ from the glass surface and from the other side,$4\, cm$. The thickness of the glass slab is......$cm$