Evolutionary history of plants phloem on the outside. Since xylem cells comprise dead, lignified tissue, subsequent rings of xylem are added to those already present, forming wood. The first plants to develop secondary growth and a woody habit, were apparently the ferns, and as early as the Middle Devonian one species, "Wattieza", had already reached heights of 8 m and a tree-like habit. Other clades did not take long to develop a tree-like stature. The Late Devonian "Archaeopteris", a precursor to gymnosperms which evolved from the trimerophytes, reached 30 m in height. The progymnosperms were the first plants to develop true wood, grown from
Haryana Seeds Development Corporation Development Corporation has six Seed processing plants at Umri, Hisar, Sirsa, Yamuna Nagar, Tohana and Pataudi in Haryana state. HSDC has one Marketing Office at Bhiwani, Haryana and 74 Sale Counters. In year 2013, Managing Director Khemka has demand of Central Bureau of Investigation inquiry on purchase nearly 10,000 tonnes of wheat seeds from private suppliers, which was started on 18 October 2013. HSDC has received the "Second Best Productivity Performance Award" from National Productivity Council of India in the year 2004. Haryana Seeds Development Corporation Haryana Seeds Development Corporation is an Indian state government undertaking company, established in the