Heroin is chemically known as $.........$.

Identify the chiral molecule from the following.

The coefficient of $x^k$ in the expansion of $\frac{1-2x-x^2}{e^{-x}}$ is

What type of life cycle in plants is indicated by the given figure?

What is the science that deals with the study of plants from various perspectives called?

The decay rate for a certain mass of a radioactive substance measured at different times varies with time as shown in the figure. The count rate at $t = 8 \, hr$ will be: