Step 1: Understanding the Question:
The question asks to match biological terms related to conservation and research with their appropriate definitions.
Step 2: Detailed Explanation:
• Arboratum (A-III): Derived from "Arbor" meaning tree. It is a specialized botanical garden dedicated primarily to the collection of living trees and shrubs for study and display.
• Herbarium (B-IV): A repository of dried, pressed, and preserved plant specimens mounted on sheets. These are essential for taxonomic research and plant identification. While whole plants are often used, "dried leaf specimen" represents the core technique.
• Biodiversity hotspot (C-I): A term coined by Norman Myers. It refers to a biogeographic region that is both a significant reservoir of biodiversity and is threatened with destruction. It must contain at least $1500$ species of vascular plants as endemics.
• Germplasm (D-II): This refers to the sum total of all genes (genetic material) present in a species or a reproductive cell. It is the basic material used in plant breeding to develop new varieties.
Final Answer:
The matching results in A-III, B-IV, C-I, and D-II.
This corresponds to option (A).