Symbiosis is classified into three types: parasitism, commensalism, and mutualism. Parasitism involves one organism benefiting at the expense of the other, like a tapeworm living in a human intestine. Commensalism occurs when one organism benefits without affecting the other, such as an orchid growing on a tree. Mutualism is a reciprocal relationship where both organisms benefit, exemplified by algae and water ferns living together. Symbiotic relationships impact ecosystems, and an overabundance of parasitism can cause problems.

4. Symbiosis is
classified into three
types:
1. Parasitism;
2. Commensalism;
and

5. Parasitism is a kind of
hunter-prey relationship.
The parasite depends on
another organism (host) for
food, protection, and
reproduction.
Example:
tapeworm and human
intestine

6. Tapeworm infestation is an example of
parasitism.

8. Commensalism is a relationship
when an organism benefits
from another without harming.
The first organism is benefitted
while the other is neither
Benefitted nor harmed.
Example:
Orchid and tree

9. Orchid attached to the tree is an
example of commensalism.

10. Mutualism is a kind of
relationship where both
organisms benefit. It is a give
and take relationship between
two organisms where they can
be benefitted from each other.
Example:
Anabaena and azolla

11. Anabaena living with Azolla is an
example of mutualism.

12. Key Concept:
Symbiosis affects the
food chain. If a harmful
kind of relationship
dominates in an
ecosystem, it will cause
problem.
Example:

14. Thank You
for
watching
and
listening

15. Edmar P. Tiburcio