Where are injured and severely ill animals provided with a safe shelter?

Assertion $(S)$: Zoological parks operate under the control of $CZA$ (Central Zoo Authority).
Reason $(R)$: Zoological parks are places where wild animals are kept in protected environments under human care.
$(A)$ Both $S$ and $R$ are true,and $R$ is the correct explanation of $S$.
$(B)$ Both $S$ and $R$ are true,but $R$ is not the correct explanation of $S$.
$(C)$ $S$ is true and $R$ is false.
$(D)$ $S$ is false and $R$ is true.

The keys are based on contrasting characters generally in a pair called

What is the process of treating herbarium sheets to prevent fungal and insect attacks called?

Select the incorrect statement regarding taxonomic keys:

Which of the following chemicals is used for poisoning the specimens in herbarium technique?