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Life Processes and Nutrition Quiz

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Questions and Answers

What is needed for maintenance processes to prevent damage and break-down?

Sunlight

Energy (correct)

Water

Minerals

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

Respiration

Digestion

Photosynthesis

Nutrition (correct)

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

To synthesize water

To produce more energy

To increase body temperature

To obtain carbon-based molecules (correct)

What kind of reactions are commonly used by organisms to break down molecules?

Oxidising-reducing reactions Signup and view all the answers

Why do organisms need to convert energy sources into a uniform source of energy?

For maintaining living structures Signup and view all the answers

What is a common source of oxygen for many organisms?

Outside the body Signup and view all the answers

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

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

Why is a transportation system required in multi-cellular organisms?

To carry food and oxygen to all parts of the body. Signup and view all the answers

What is the role of specialized tissues in multi-cellular organisms?

To carry out specific functions like food and oxygen uptake. Signup and view all the answers

Why do chemical reactions in organisms create waste by-products?

To generate energy for cellular processes. Signup and view all the answers

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

All parts of the body may not receive sufficient nutrients. Signup and view all the answers

Why might simple diffusion not be sufficient for meeting the needs of all cells in multi-cellular organisms?

Because it cannot distribute food and oxygen efficiently. Signup and view all the answers