Plants are multicellular, eukaryotes organisms. They have membrane-bound organelles. A plant cell has a rigid cell wall, a central vacuole, plasmodesmata and plastids, which make it unique among all other type of eukaryotes cells.Plant cells sustain the photosynthesis process, during which oxygen is produced.lants are multicellular, eukaryotes organisms. They have membrane-bound organelles. A plant cell has a rigid cell wall, a central vacuole, plasmodesmata and plastids, which make it unique among all other type of eukaryotes cells.
During the Qin Dynasty, some of these early fortifications along the northern frontier would become part of the âfirstâ Great Wall. In 215 BC, the First Emperor Qin Shi Huang ordered his general Meng Tian to start constructing the Great Wall to protect against the northern nomads.
The Bei Qi kingdom (550â577) built or repaired more than 900 miles of wall, and the short-lived but effective Sui dynasty (581â618) repaired and extended the Great Wall of China a number of times.