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Copy of MRS GREN
Transcript of Copy of MRS GREN
Biology is the study of living organisms.
Which is one is living and which one is non-living? Why do you think that?
M R S G R E N
There is a mnemonic to remember the 7 factors that all living organisms share.
M is for Movement
R is for respiration
Respiration is the process by which living organisms get energy from their food. Food is broken down into or converted into glucose and the glucose broken down further. This releases energy for growth, movement, and various other life processes.
Respiration is NOT the same as breathing.
S is for sensitivity
Sensitivity is detecting changes in the surroundings and responding
G is for growth
R is for Reproduction
E is for Excretion
Excretion is the process of getting rid of waste materials produced by the body's metabolism
This includes carbon dioxide and urine in most animals and mainly carbon dioxide and oxygen in plants as well as waste chemicals stored in the leaves.
N stands for Nutrition
All living organisms need to take up nutrients. This can be through the roots as in plants or through feeding as in animals.
Allows organisms to change position in their environment.
Oxygen is often needed for respiration to occur leading to the following word equation
Glucose + oxygen carbon dioxide + water + energy released
The energy released during respiration is used to power all metabolic processes in the organisms. Growth, movement, making and repairing cells, making enzymes......
Stimulus: A change in the environment. Many organisms have sense organs to sense a stimulus.
Growth is the permanent increase in size and dry mass of an organism.
Growth might be the result of cell division, an increase in cell size, or both.
Reproduction is when organisms make new generations of species
Asexual reproduction: single parent produces offspring that are identical to the parent
Sexual reproduction: where two individuals produce gametes (sperm and egg or pollen and ovum), which combine to produce offspring which have characteristics of both parents.
Autotroph: make their own food
Plants produce their own nutrition through photosynthesis.
Heterotroph: need to ingest food
Animals need to eat their food.
Excretion is not the same as egestion. Egestion is the removal of undigested food from the gut through feces. This material has never truly been inside the body so is not classified as a waste product.
Cells: the basic unit of life.
Unicellular organism: composed of one cell
Multicellular organism: composed of more than one cell
Why? To find food, escape predators, find better living conditions, find a mate, to move towards the sun.
Response: a change in behavior due to a stimulus
Nutrition: taking in and using food as a supply of energy for growth.
Metabolism: all of the chemical activities performed by an organism.
Needs of Organisms
Organisms also NEED things to survive:
1) Food: provides a source of energy for survival
2) Water: allows the cells to perform their jobs
3) A place to live with the right temperature:
Homeostasis: the maintenance of a stable internal environment
4) Air: Provides gases for respiration to occur
5) ***Sunlight: source of all energy for living things.
Decomposer: type of heterotroph that gets food by breaking down the nutrients in dead organisms or animal waste.