Movement
Movement is the ability of an organism or any of its parts to change position or location. This can be the whole organism moving from place to place, like animals walking, or parts moving independently, such as the opening of plant leaves or the beating of cilia in microorganisms.
- Movement enables organisms to find food, escape danger, and interact with their environment.
- It can be voluntary or involuntary, and may involve muscles or other mechanisms.
Respiration
Respiration is a series of chemical reactions inside cells that break down nutrient molecules, such as glucose, to release energy. This energy powers all metabolic activities necessary for life, including growth, movement, and repair.
- Respiration is essential for providing energy to cells.
- It involves converting chemical energy stored in nutrients into usable energy forms like ATP.
Sensitivity
Sensitivity is the capacity of an organism to detect changes in its internal or external environment and respond appropriately. This allows organisms to adapt to varying conditions and maintain homeostasis.
- Sensitivity helps organisms avoid harm and find resources.
- Responses can be immediate or gradual, involving nervous or chemical signals.
Growth
Growth refers to a permanent increase in size and dry mass of an organism. It involves cell division and enlargement, leading to development and maturation over time.
- Growth is a sign of life and development.
- It requires energy and raw materials obtained through nutrition.
Reproduction
Reproduction is the biological process by which organisms produce offspring of the same species, ensuring the continuation of their kind.
- Reproduction can be sexual or asexual.
- It allows genetic information to be passed to the next generation.
Excretion
Excretion is the process of removing waste products generated by metabolic activities from the organism to maintain internal balance and prevent damage.
- Excretion removes substances like carbon dioxide, urea, and excess salts.
- It is vital for maintaining a stable internal environment (homeostasis).
At-a-glance summary
Comparison table
| Feature | Definition | Biological Importance |
|---|---|---|
| Movement | Change in position or location of organism or its parts | Allows interaction with environment, finding food, and avoiding danger |
| Respiration | Chemical reactions breaking down nutrients to release energy | Provides energy for all life processes |
| Sensitivity | Ability to detect and respond to environmental changes | Enables adaptation and survival |
| Growth | Permanent increase in size and dry mass | Indicates development and maturity |
| Reproduction | Production of offspring of the same species | Ensures species survival |
| Excretion | Elimination of metabolic waste products | Maintains internal balance and prevents toxicity |
Active recall
Quick check
1. What does movement in living organisms involve?
A change in position or location of the organism or its parts.
2. Why is respiration important?
It releases energy from nutrients needed for metabolic processes.
3. What is the purpose of excretion?
To remove waste products and maintain internal balance.