What processes would you consider essential for maintaining life?
Living organisms are well-organised structures that are likely to break down over time due to environmental effects. To prevent this damage and maintain order, living creatures must keep repairing and maintaining their structures. The processes that together perform this maintenance job are called life processes.
The processes essential for maintaining life include nutrition, respiration, transport of materials within the body, and excretion of waste products. Nutrition is the process of transferring energy from outside the body to the inside. Respiration provides the energy needed for maintenance functions. Transport carries materials within the body, while excretion removes waste products from the body.
Explanation
The answer is derived from the 'What you have learnt' section and the introduction of Chapter 5. The text explicitly states that maintenance of life requires nutrition, respiration, transport, and excretion. It explains that these processes are necessary to prevent the break-down of organised structures and to provide the energy required for maintaining the state of order in the body.