Answer: An Organ System
Explanation: Vascular plants have two distinct organ systems: a shoot system, and a root system. The shoot system generally grows above ground, where it absorbs the light needed for photosynthesis. The root system, which supports the plants and absorbs water and minerals, is usually underground.
Plants are used for herbs, such as lavender, or other scented plants, like coconut and almond. Many plants are used for their medical properties, such a chamomile and jojoba. Plants can also be used to bathing or showering! Plants can be used in clothes, art, and symbolic uses!
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A scientist involved with either Molecular Biology or Genetics would have the highest chance of studying DNA.