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Distinguishing Living from Non-Living Things

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Distinguishing Living from Non-Living Things

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Questions and Answers

What is the primary characteristic used to distinguish living from non-living things?

Growth over time

Molecular movement (correct)

Visible movement

Green color in plants

Which of the following statements is true about viruses?

Viruses are classified as living beings by all biologists

Viruses are undoubtedly alive

Viruses do not show molecular movement until they infect a cell (correct)

Viruses exhibit visible growth

Why is visible movement alone not a sufficient characteristic to define life?

Some animals can breathe without visible movement

Plants with non-green leaves would be considered non-living

Molecular movements are not visible to the naked eye

All of the above (correct)

What is the primary reason for the controversy surrounding the classification of viruses as living beings?

Viruses do not show molecular movement until they infect a cell Signup and view all the answers

Which of the following is NOT considered evidence for life?

A rock sitting still Signup and view all the answers

In multi-cellular organisms, why is simple diffusion not sufficient to meet the requirements of all cells?

Cells are not in direct contact with the surrounding environment Signup and view all the answers

What creates the need for a transportation system in multi-cellular organisms?

Specialized tissues taking up food and oxygen at one place Signup and view all the answers

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

Different body parts need these substances Signup and view all the answers

What is the purpose of excretion in organisms?

To remove waste by-products created during energy generation Signup and view all the answers

Why do multi-cellular organisms need to discard waste by-products outside the body?

By-products are not useful and can be harmful to cells Signup and view all the answers

What is the main purpose of life processes?

To prevent damage and breakdown of the organism Signup and view all the answers

Why is energy from outside sources necessary for organisms?

To power the life processes that maintain the organism Signup and view all the answers

What is the primary reason for the need for additional raw materials from outside the organism?

To enable the organism to grow in body size Signup and view all the answers

Why are oxidizing-reducing reactions commonly used by organisms?

To facilitate the breakdown of carbon-based molecules Signup and view all the answers

What is the primary reason for the need for organisms to convert energy from food sources into a uniform source of energy?

To power the various molecular movements needed for maintaining living structures and growth Signup and view all the answers