12 Questions
What is needed for maintenance processes to prevent damage and break-down?
Energy
What is the process called that transfers a source of energy from outside the body to the inside?
Nutrition
Why do organisms need additional raw material from outside if their body size is to grow?
To obtain carbon-based molecules
What kind of reactions are commonly used by organisms to break down molecules?
Oxidising-reducing reactions
Why do organisms need to convert energy sources into a uniform source of energy?
For maintaining living structures
What is a common source of oxygen for many organisms?
Outside the body
Why might a single-celled organism not need specific organs for gas exchange?
Because all its cells are in direct contact with the environment.
Why is a transportation system required in multi-cellular organisms?
To carry food and oxygen to all parts of the body.
What is the role of specialized tissues in multi-cellular organisms?
To carry out specific functions like food and oxygen uptake.
Why do chemical reactions in organisms create waste by-products?
To generate energy for cellular processes.
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.
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.
Test your knowledge on the maintenance processes of living organisms and how energy from food is transferred inside the body for vital functions. Explore concepts related to life processes and nutrition.
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