Life Processes and Respiration

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Questions and Answers

What is one way we determine if something is alive?

Sound made by the object
Size of the object
Visible movement (correct)
Color of the object

Molecular movements are necessary for life.

True (A)

What do we call the processes that maintain living organisms?

Life processes

What is the source of energy that organisms need for maintenance processes?

Food Signup and view all the answers

The process of acquiring oxygen for breakdown of food is called _____

respiration Signup and view all the answers

Match the following life processes with their descriptions:

Nutrition = Process of taking in food Respiration = Process of taking in oxygen and releasing carbon dioxide Growth = Increase in size or mass Excretion = Process of eliminating waste products Signup and view all the answers

What happens when an organism's body size increases?

It becomes more complex and may need specialized systems for functions. Signup and view all the answers

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Study Notes

What are Life Processes?

Movement is not the only indicator of life, molecular movement is essential and occurs in all living organisms.
Life processes are maintenance functions that occur in all living organisms to prevent breakdown and damage.
Energy is required for life processes and is obtained from food sources outside the body.
Food is broken down and converted into a uniform source of energy to fuel molecular movement and growth.
The oxidation-reduction reaction is a common chemical method for breaking down molecules, often using oxygen from the environment.

Respiration and Cellular Needs

Respiration is the process of acquiring oxygen and using it to break down food for cellular needs.
Single-celled organisms directly exchange materials with their environment, but multi-cellular organisms require specialized systems.
Multi-cellular organisms have specialized tissues and organs for function, including food uptake, gas exchange, and waste removal.