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12 Questions

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Life Processes and Nutrition

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Questions and Answers

What is the purpose of the maintenance processes mentioned in the text?

To increase body size

To produce energy

To control the environment

To prevent damage and break-down (correct)

What is the primary source of energy for organisms mentioned in the text?

Water

Sunlight

Food (correct)

Air

Why do organisms need to break down the outside sources of energy?

To prevent damage and break-down

To increase body size

To convert to uniform energy source (correct)

To control the environment

What type of molecules do most food sources for organisms on Earth consist of?

Carbon-based Signup and view all the answers

What type of chemical reactions are commonly used to break down molecules in organisms?

Oxidising-reducing reactions Signup and view all the answers

Where do many organisms get oxygen required for oxidising-reducing reactions?

From air Signup and view all the answers

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

Because all its cells are in direct contact with the environment Signup and view all the answers

In multi-cellular organisms, why is simple diffusion insufficient to meet the needs of all cells?

Because of the specialized functions of different body parts Signup and view all the answers

Why is a transportation system needed in multi-cellular organisms for carrying food and oxygen?

Because food and oxygen are taken up at one place but needed by all parts of the body Signup and view all the answers

What is the process called when waste by-products are removed from the body and discarded outside?

Excretion Signup and view all the answers

Why do multi-cellular organisms need specialized tissues for functions like uptake of food and oxygen?

Because different parts of the body have different needs Signup and view all the answers

What happens when chemical reactions in an organism create by-products that are harmful to cells?

They need to be removed from the body through excretion Signup and view all the answers