Parasitism is a biological relationship where one organism benefits while the other is harmed.
It’s a core concept in Biology and specifically in ecology.
🧬 Simple definition
- Parasite → the organism that benefits
- Host → the organism that is harmed
The parasite lives on or inside the host and takes nutrients, shelter, or energy.
🧪 Types of parasitism
1. Ectoparasites (live outside the body)
- Examples:
- Tick
- Louse
- Feed on blood or skin
2. Endoparasites (live inside the body)
- Examples:
- Tapeworm
- Plasmodium
- Live in organs, blood, or intestines
3. Plant parasites
- Example:
- Cuscuta
- Take nutrients from other plants
⚖️ Key features
- One benefits, one is harmed
- Usually does not immediately kill the host (needs it to survive)
- Can cause disease or weakness
🧠 Difference from similar relationships
- Mutualism → both benefit
- Commensalism → one benefits, other unaffected
- Parasitism → one benefits, other harmed
🧍 Human examples
Parasitism in humans can lead to diseases like:
- Malaria
- Ascariasis
Bottom line
Parasitism is a natural survival strategy where one organism depends on another at its expense—common in nature and important in medicine and ecology.
If you want, I can explain how parasites enter the body and how to prevent them (especially relevant in daily life).
