Ch. 1 - Characteristics... Of Living Organisms

A complete living, or once living thing, that can carry out life sustaining processes.

MRS. GREN M - Movement R - Respiration S - Sensitivity G - Growth R - Reproduction E - Excretion N - Nutrition

Movement refers to an action by which an organism, or part of an organism, causes a change of place/position.

Respiration refers to the chemical reactions in cells that break down nutrient molecules and release energy for metabolism.

Sensitivity refers to the ability to detect and and respond to changes in stimuli in the internal and external environment.

Growth refers to a permanent increase in size and dry mass, caused by an increases in cell number or cell size or both.

Reproduction refers to the processes that create more of the same kind of organism.

Excretion refers to the process by which waste products from metabolism, toxic materials and other substances, in excess of requirement are removed from an organism.

Nutrition refers to the ability of an organism to acquire and process foods and nutrients.

Autotrophs - producers Heterotrophs - consumers

Old - various chemical processes taking place in our body New - Sum of Anabolic (creates substances) and Catabolic (breaks down substances) processes.

• Morphology - observable differences • Anatomy - Inside the body structure • DNA - Further inside

• For clarity • To avoid confusion • To understand the differences between various organisms

Species refers to a group of organisms that can reproduce and create fertile offsprings.

Binomial Nomenclature - scientific names Rules: 1. Both names must be underlined but SEPARATELY 2. First part of the name is the ‘Genus’, second part is the ‘Species’ 3. The first letter of the Genus should always be capitalised, but the first letter of the Species should always be in small letters