Characteristics of life

Organisation

Living things become increasingly ordered-complex as they combine their simple components

Tissue

A group of similar cells modified to carry out a specific function

Organ

a group of tissues that work together to carry out one or more functions

organ system

a group of organs working together to carry out one or more functions

Response

the ability of an Organism to react to change (stimulus) in their environment

Respiration

the release of energy from glucose

nutrition

the way in which organisms obtain their food

Autotrophs

make their food eg: plants

heterotrophs

can't make food they consume it eg: humans

Excretion

the removal of waste products of metabolism from the body eg: urine sweat

Reproduction

The process by which an Organism gives rise to a new Organism of the same kind

Growth

an Organism increases in size throughout its lifecycle

Growth and reproduction in Unicellular organisms

a unicellular organism grows in size and forms new organelles before it reproduces an identical copy of itself by all division (mitosis)

Growth and reproduction in multicellular organisms

a multi cellular Organism grows new cells which become more different as the Organism gets larger

Metabolism

the sum of all the chemical reactions in the body of an Organism

what are the two types of metabolic reaction?

• anabolic

• catabolic

Anabolic

a reaction in which small simple molecules combine to form more complex ones eg: Respiration, Digestion

Catabolic

a reaction in which a large complex molecule is broken down into simpler ones usually with the energy being released