TISSUES
As we have seen that in unicellular organism,one cell has all the cell organelles to perform various function,But in multicellular organisms there are millions of cell.There is "Division of Labour".This term means that some group of cells are specialised to perform a particular job and other are specialised to perform other job.
E.g.Muscle cells contract and relax to cause movement,Digestive systems is there for digestion of food,Nerve cells are for transmission of msg etc.
What is a tissue?
Tissues can be defined as a group of similar cells that perform similar function together.
What are Merismatic Tissues and Permanent Tissues?
A cell divide to form new cells that is every cells comes from pre-existing cells.when cells divide they grow in number and thus the size of organisms but all cells donot divide throughout their life.After some peroid they stop dividing and become a permanent cells.Those plant cells which divide throughout life are called Merismatic Tissues. and which stop dividing after some time are called Permanent Tissues.
Explain Merismatic Tissues?
These are the plant tissues which divide continuously and thus increase the lenght and girth of the plant.based on their position where they are found are classified into three type
- Apical Meristems
- Lateral Meristems
- Intercallary Meristems
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