These nematodes, sold under the names of Scanmask and Nemasys, are microscopic, wormlike creatures that will destroy the fungus gnats but are not harmful to people, pets, plants, or earthworms. These products can be used whenever the soil is not frozen and will keep working for many months.
Vegetative structures. There are three levels of integrated organization in the vegetative plant body: organ, tissue system, and tissue. The organs of the plantâthe roots, stems, and leavesâare composed of tissue systems (dermal tissue, ground tissue, and vascular tissue; see below Tissue systems).
ï§A plant also has different cells in its roots, stems, and leaves. Tissues: ï§In your body, a single skin cell or blood cell does not work alone. ï§Cells work together in groups called tissues. ï§A tissue is a group of similar cells that work together carrying out a certain job.ï§For example, skin cells work together as skin tissue that covers and protects your body.An organ is a group of tissues that work together doing certain jobs. ï§Roots, stems, and leaves are organs of a plant. ï§A leaf is an organ that makes food for the plant. ï§The roots of a plant are the main organ in the root system of a plant. ï§The heart, lungs, and brain are examples of animal organs.