★ Must-know
Visible movement alone does not establish whether something is alive, because living organisms may have no visible movement while molecular movement continues.
Life maintenance requires:
Further detail
Environmental breakdown → continuous molecular repair and maintenance
1. What are life processes in an organism?
2. A plant shows no visible movement, but molecular activity continues in its cells. What does this indicate about whether the plant is alive?
3. Which group consists of processes needed to maintain life?
What are life processes?
Functions that maintain an organism’s structures and prevent their damage and breakdown.
Why does visible movement alone not establish whether something is alive?
Living organisms may lack visible movement while molecular movement continues.
Which processes are needed to maintain life?
Nutrition, respiration, transport of materials, and excretion.
What materials do autotrophs use to make food?
Simple materials such as carbon dioxide and water.
How do heterotrophs obtain food?
They obtain complex food directly or indirectly from autotrophs.
What does photosynthesis convert carbon dioxide and water into?
Carbohydrates.
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