Organisms interact in various ways for survival, including competition over resources, predation where one organism benefits by harming or killing another, and symbiosis where organisms live together in mutualism benefiting each other, parasitism harming the host, or commensalism benefiting one without affecting the other. Examples of these interactions include carabao and birds in mutualism, lice parasitizing dogs, and trees hosting orchids in commensalism.

1. Interactions in an Ecosystem
Organisms interact with one another for their survival.
Different types of interactions
• Competition – organisms compete with each other to
obtain resource/s.
Example:

2. • Predation – an interaction in which one organism benefits
and the other one is being harm or killed.
Example:

3. •Symbiosis – organisms live together
- Mutualism – A two way relationship/give and take
relationship. Both organisms benefits.
Example: Carabao and bird
- Parasitism – A relationship in which one organism benefits
and the other one is harmed or injured.
Example: Lice and dog
Host = dog
parasite = lice

4. - Commensalism –An
interaction in which one
organism benefits and the
other one is neither harmed
nor injured.
Example:Tree and orchid
- both organisms can be
called as commensal