Characteristics and classification of living organisms Flashcards
What does MRS GREN STAND FOR?
Movement
Respiration
Sensitivity
Growth
Reproduction
Excretion
Nutrition
Movement
All living things move. It is very obvious that a leopard moves but what about the thorn tree it sits in? Plants too move in various different ways. The movement may be so slow that it is very difficult to see.
Respiration
Respiration is the release of energy from food substances in all living cells. Living things break down food within their cells to
release energy for carrying out the following processes
Sensitivity
All living things are able to sense and respond to stimuli around them such as light, temperature, water, gravity and chemical
substances.
Growth
Growth is seen in all living things. It involves using food to produce new cells. The permanent increase in cell number and size
is called growth.
Reproduction
All living organisms have the ability to produce offspring
Excretion
All living things excrete. As a result of the many chemical reactions occurring in cells, they have to get rid of waste products
which might poison the cells. Excretion is defined as the removal of toxic materials, the waste products of metabolism and substances in excess from the body of an organism.
Nutrition
Living things take in materials from their surroundings that they use for growth or to provide energy. Nutrition is the process by
which organisms obtain energy and raw materials from nutrients such as proteins, carbohydrates and fats.
Classification of living organisms
THE ORDER OF THE 7
1.Kingdom
2.Phylum
3.Class
4.Order
5.Family
6.Genus
7.Species
What can it be based on?
It can be based on two different systems natural and artificial
Natural Classification
Based of two things
- homologous structures
-evolutionary relationships
Natural Classification
Based of two things
- homologous structures
-evolutionary relationships
