Life Processes in Living Organisms
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Questions and Answers

What are the processes that perform the maintenance job in living organisms called?

Life processes

What is the process called that transfers a source of energy from outside the body of an organism to the inside?

Nutrition

Why is energy needed for the maintenance job in living organisms?

To prevent damage and break-down

What kind of molecules do most food sources for organisms on Earth contain?

<p>Carbon-based molecules</p> Signup and view all the answers

Why do different organisms use different kinds of nutritional processes depending on the complexity of carbon sources?

<p>To utilize the carbon-based molecules effectively</p> Signup and view all the answers

Why are a series of chemical reactions in the body necessary for converting energy from food into usable forms?

<p>To provide a uniform source of energy for maintaining living structures and growth</p> Signup and view all the answers

What do we call the process of acquiring oxygen from outside the body and using it in the break-down of food sources for cellular needs?

<p>Respiration</p> Signup and view all the answers

Why might a single-celled organism not need specific organs for taking in food, exchange of gases, or removal of wastes?

<p>Because the entire surface of the organism is in contact with the environment.</p> Signup and view all the answers

Why is a transportation system needed in multi-cellular organisms for carrying food and oxygen from one place to another in the body?

<p>Because all parts of the body need food and oxygen, which are taken up at one place.</p> Signup and view all the answers

What are the by-products created when chemical reactions use the carbon source and oxygen for energy generation?

<p>Waste by-products</p> Signup and view all the answers

Why are waste by-products needed to be removed from the body and discarded outside?

<p>Because they are not only useless for the cells but could even be harmful.</p> Signup and view all the answers

Why does a transportation system in multi-cellular organisms need to transport waste away from cells to excretory tissues?

<p>To discard waste outside the body through a process called excretion.</p> Signup and view all the answers

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