Which of the following is required for the preservation of a herbarium?

$A$ "systematic collection of trees, shrubs, herbs, climbers, and other living plants brought from different parts of the world for scientific purposes" is known as .......

Knowledge of which of the following is essential for the identification of newly discovered organisms?

$A$ student of taxonomy was puzzled when told by his professor to look for a key to identify a plant. He went to his friend to clarify what 'Key' the professor was referring to? What would the friend explain to him?

Which of the following is $NOT$ a reason for the increasing importance of botanical gardens?

$S$ Statement: Periodic poisoning is done to protect against fungi,insects,and moisture.
$R$ Reason: To preserve dried plant specimens,they are sprayed with specific chemicals; this process is called poisoning.
$(a)$ 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.