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Nutrition, respiration, excretion, response to surroundings (sensitivity), movement, control of internal conditions, reproduction, growth and development.
Key words: nutrition · respiration · excretion · growth
Faeces are mostly undigested food that was never part of cell metabolism, so removing them is egestion. Excretion removes waste made by metabolism, such as carbon dioxide and urea.
Key words: egestion · metabolism
It takes in or makes the materials it needs for energy, growth and development.
Key words: nutrition
All the chemical reactions occurring in a cell or organism.
Key words: metabolism
The regulation of internal conditions within limits suitable for cell function.
Key words: homeostasis
A detectable change in the internal or external environment.
Key words: stimulus
Removal of metabolic waste and substances in excess of requirements.
Key words: excretion
Removal of undigested material that was not absorbed from the gut.
Key words: egestion
Not made of cells.
Key words: acellular
Evidence to look for: A change in position of an organism or part of it. Do not assume: Movement need not be locomotion.
Key words: Movement
Evidence to look for: Cell reactions release energy from nutrients. Do not assume: Respiration is not breathing.
Key words: Respiration
Evidence to look for: A stimulus is detected and produces a response. Do not assume: The response may be slow.
Key words: Sensitivity
Evidence to look for: Internal conditions are regulated within limits. Do not assume: This is homeostasis.
Key words: Control
Evidence to look for: A permanent increase and organised change. Do not assume: Water uptake alone may be temporary.
Key words: Growth and development
Evidence to look for: New organisms arise sexually or asexually. Do not assume: Not every individual must reproduce.
Key words: Reproduction
Evidence to look for: Metabolic waste or excess substances are removed. Do not assume: Undigested food leaves by egestion.
Key words: Excretion
Evidence to look for: Materials are obtained or manufactured for cells. Do not assume: Plants manufacture glucose but still need resources.
Key words: Nutrition
False. Movement alone is weak evidence. Machines and flames move, while dormant or sessile organisms may show little visible movement.
False. Respiration is a chemical process in cells. Breathing moves air into and out of lungs.
False. Faeces contain mainly unabsorbed material and leave by egestion. Excretion removes products of metabolism or excess substances.
