The crossword solution for the term 'Rudimentary Plant Contained in Seed' is 'EMBRYO, ' which is a six-letter word. An EMBRYO is an early stage of development in a plant or animal, typically referring to the stage before birth or hatching. In plants, the EMBRYO is contained within the seed and is the first stage of growth after germination. The EMBRYO contains the genetic material of the plant, and when the seed is exposed to the right conditions, the EMBRYO will begin to grow into a mature plant.