Parasitism is a type of relationship between two living organisms where:
- One benefits (the parasite)
- The other is harmed (the host)
🧠 Simple definition
Parasitism = “one wins, one loses”
🦠 Examples
- Tapeworms living in human intestines
- Mosquitoes feeding on blood
- Ticks attached to animals
- Certain fungi infecting plants
🔍 Types of parasites
1. Ectoparasites (outside the body)
- Live on the surface of the host
- Example: lice, ticks
2. Endoparasites (inside the body)
- Live inside organs or tissues
- Example: worms, protozoa
⚙️ Key features
- Parasite depends on the host for food or survival
- Usually doesn’t kill the host immediately (needs it alive)
- Can cause disease or weakness over time
🧬 Related concept
Parasitism is one of the main types of biological relationships, along with:
- Mutualism (both benefit)
- Commensalism (one benefits, other unaffected)
🧠 Real-world importance
- Causes many human diseases (malaria, intestinal worms)
- Affects agriculture (crop damage)
- Important in ecology and evolution
🧾 Bottom line
Parasitism is a harmful biological relationship where one organism survives at the expense of another.
If you want, I can give you easy exam definitions, diagrams, or MCQs on this topic.
