Multicellular organisms, such as plants and animals, are organised into highly complex and structured systems. The order from least complex to most complex is:
Cells are the basic structural and functional unit of a living organism. They are specialised to carry out specific functions.
Tissues are groups of cells with similar structures that work together to perform a shared function. For example, muscle tissue is a group of muscle cells that work together to contract and relax. This leads to movement at a joint.
Examples of tissues include:
An organ is made up of various tissues that work together to perform specific functions. For example, the heart contains fibrous tissue that makes up the heart valves and muscle tissue to pump the blood.
Some examples of organs are:
An organ system is a group of organs with related functions that work together to perform bodily functions. For example, the circulatory system is responsible for pumping and circulating blood around the body. It includes the heart and blood vessels.
Some examples of organ systems are:
An organism is made up of several organ systems that perform the processes required for life.
1. There are a lot of specialised plant cells that come together to form different plant tissues.
2. The different plant tissues come together to form organs.
3. These organs come together to form organ systems.
4. These organ systems work together to form the organism, which is the entire plant in this case.