DENDROLOGY

Detailed explanation-1: -The correct option is D I, III. Herbarium and museums have preserved plant specimens. Botanical gardens are collections of living plants Manuals are useful in providing information for identification of names of species found in an area.

Detailed explanation-2: -The herbarium is defined as a storehouse of collected plant specimens. These plant specimens are dried, pressed, and are then preserved in sheets. These sheets are then stored and arranged in a sequence that is universally accepted by the system of classification.

Detailed explanation-3: -These materials may include pressed and mounted plants, seeds, dry fruits, wood sections, pollen, microscope slides, silica-stored materials, frozen DNA extractions, and fluid-preserved flowers or fruits; all are generally referred to as herbarium specimens.