Grade 7 science (levels of biological organization)

Cards (17)

Biology 
The branch of science which deals with the study of life of all the organisms on earth
Biological levels of organization
Cells
Tissues
Organs
Organ systems
Organism
Population
Community
Ecosystem
Biosphere
Cells are the basic unit of life
Plant cells 
Have a rigid cell wall made of cellulose molecules
Animal cells 
Have flexible cell membranes
Tissue 
A group of cells performing a similar function
Organ 
A group of tissues performing a similar function
Examples of organs 
Brain
Heart
Lungs
Organ system 
A group of organs performing a similar function
Example of an organ system
Respiratory system
Organism 
An individual living thing that is made up of one or more organ systems
Population 
A group of organisms of one type that live in the same area
Example of a population 
A pride of lions in Kenya, Africa
Community 
A population that lives together in a defined area, consisting of all the different species within that area
Ecosystem 
Composed of a community, its non-living surroundings, and physical components of the environment
Biosphere 
The part of the earth that contains all ecosystems
Every animal, plant, bacteria, rock, and molecule is part of the earth's biosphere