Life Processes and Nutrition
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Questions and Answers

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

Life processes

Why do organisms need additional raw material from outside if their body size is to grow?

To provide building material for growth

What is needed to transfer energy from outside the body of an organism to the inside?

Nutrition

What are the most common chemical means used by organisms to break down molecules?

<p>Oxidising-reducing reactions</p> Signup and view all the answers

Why do many organisms use oxygen sourced from outside the body?

<p>To facilitate oxidising-reducing reactions</p> Signup and view all the answers

Why might single-celled organisms not require specific organs for gas exchange?

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

What is respiration?

<p>The process of acquiring oxygen from outside the body and using it to break down food sources for cellular needs.</p> Signup and view all the answers

Why do multi-cellular organisms require a transportation system for food and oxygen?

<p>Because not all cells are in direct contact with the surrounding environment, so simple diffusion is not sufficient.</p> Signup and view all the answers

How do multi-cellular organisms ensure all parts of the body receive necessary nutrients and oxygen?

<p>By having specialized tissues that can transport food and oxygen to different parts of the body.</p> Signup and view all the answers

What problem arises when food and oxygen are taken up at one place in multi-cellular organisms?

<p>The need for a transportation system to carry these substances to all parts of the body.</p> Signup and view all the answers

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