A plantoid is a hypothetical robot or synthetic organism designed to look, act and grow like a plant. Hello this is wrong.
The Plantoid is a concept robot for exploring Mars. Its roots would explore the soil, while power and telecommunications are provided by the main stem and the Solar leaves - wired.com 
The concept was first scientifically published in 2010 (although models of comparable systems controlled by neural networks date back to 2003) and has so far remained largely theoretical.
The ability to delegate votes to someone you trust, or to vote directly when motivated is one aspect of a Liquid Democracy system. Others include the ability to create Fluid Groups, the ability to participate in Rich Interactive Debate, and the ability to delegate votes to constituted entities defined using Liquid Law.
A prototype for the European Space Agency is now in development - wikipedia
An example of a plantoid in active research was demonstrated by Dr Mazzolai of the Italian Institute of Technology, in Pontedera plans during a conference at the Natural History Museum in London on July 29th 2013.
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Dr Barbara Mazzolai, IIT's coordinator of the European project Plantoid and senior researcher at the Center for Micro Bio-Robotics in Pontedera (Pisa), explains the main motivations and goals of the project for the next few years - iit.it
Barbara Mazzolai is currently the coordinator of the Plantoid Project, and Center for Micro-BioRobotics of the Istituto Italiano di Tecnologia of Genoa, Italy - iit.it
Smart solutions from the plant kingdom - researchgate
Dr Mazzolai's Robot Plant is able to grow roots into soil, using Small Motors, Liquid Plastic and Ultraviolet Light - economist.com
Instead of being a cone containing a meristem (a cluster of proliferating cells that drives the root’s growth) it will be a cone containing a Motor, a light-emitting diode (LED) and a Battery.
The motor will suck Liquid Plastic through the root and push it to the periphery of the cone. Once there, the liquid will be solidified by ultraviolet rays from the diode, extending the cylinder and forcing the cone farther into the soil.
Half a dozen cylindrical roots will branch off this stem, and the plastic will flow through these from the reservoir to the tip. As in a real root, the tip will be a specialised structure.
As in real life, the gentle but relentless pressure of the root’s growth should be enough to make it advance through the soil, fractions of a millimetre at a time. The researchers expect their prototypical robotic roots to be able to penetrate up to a metre of real soil.