1. Structural Structure: Cells are the main structural elements of living organisms. Parenchyma, collenchyma and scherenchyma form the structure of plants.
2. Energy production: Green plants convert solar energy into chemical energy in the process of photosynthesis. Animals convert static energy into kinetic energy.
3. Balance: Different cells of the body maintain biochemical and physiological balance.
4. Transport: The transport tissues of organisms are blood, xylem and phloem. These tissues transport food, water, enzymes, hormones, mineral salts etc.
5. Metabolism: Metabolism and metabolism are together. Cells synthesize and break down a variety of chemicals in the body.
6. Digestion and absorption: Different cells of the digestive system digest and absorb food.
7. Defense: White blood cells and other cells eat germs and produce antibodies. Antibodies are active against germs.
8. Activity: Different types of activities take place in cells. This activity keeps the organism active and alive.
9. Vision: Rod cells and cone cells in the eyes of vertebrates help in vision.
10. Conduction of impulses: Muscle cells and nerve cells conduct electrical impulses in the body.
11. Connection: Blood cells and bone marrow maintain the connection between different cells and tissues of the body.
12. Secretion: Hormones, enzymes and honey are secreted from different types of glands.
13. Excretion: Nitrogenous waste products are produced as a result of metabolism in the body. These waste products are excreted through the kidneys.
14. Reproduction: Somatic cells carry out asexual reproduction and reproductive cells carry out sexual reproduction.