Questions and Answers
What is the purpose of the maintenance processes mentioned in the text?
To prevent damage and break-down
What is the primary source of energy for organisms mentioned in the text?
Food
Why do organisms need to break down the outside sources of energy?
To convert to uniform energy source
What type of molecules do most food sources for organisms on Earth consist of?
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What type of chemical reactions are commonly used to break down molecules in organisms?
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Where do many organisms get oxygen required for oxidising-reducing reactions?
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Why might a single-celled organism not require specific organs for gas exchange?
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In multi-cellular organisms, why is simple diffusion insufficient to meet the needs of all cells?
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Why is a transportation system needed in multi-cellular organisms for carrying food and oxygen?
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What is the process called when waste by-products are removed from the body and discarded outside?
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Why do multi-cellular organisms need specialized tissues for functions like uptake of food and oxygen?
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What happens when chemical reactions in an organism create by-products that are harmful to cells?
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