(a) Biotic and abiotic components are the two main components of our environment.
The living parts of the ecosystem are referred to as biotic components. For example: plants, animals humans etc.
The non-living parts of the ecosystem are referred to as abiotic components. For example: land, air etc.
(b) Xylem is the water-conducting tissue of plants. If the xylem of a plant is removed, then the conduction of water will not take place. As a result of which the plant will die.
(c) Neuron and muscular tissues are involved in control and coordination in multicellular organisms.