Symbiosis Lesson

Discover the three types of symbiosis as you meet some friendly and not-so-friendly partnerships between plants and animals.

Supplies:

• nature notebook (or blank, white paper)
• pencil
• colored pencils or something else colorful

Extra Learning Resources

Discussion Questions

1. The word “symbiosis” comes from two Latin or Greek roots. What are the roots, and what do they mean when combined? (“Sym” means together, and “bios” means a way of life. Combined, they mean “a together way of life.”)
2. Name the three types of symbiosis and briefly explain each one. (Mutualism is when both partners benefit from the relationship. Commensalism occurs when one partner benefits while the other remains unaffected. Parasitism is when the relationship benefits one partner and harms the other.)
3. Name one example of each type of symbiosis. (Answers will vary. One example of mutualism is the relationship between plants and pollinators. One example of commensalism is the relationship between barnacles and whales. One example of parasitism is the relationship between ticks and humans. )

Nature Walk

Take a nature walk and look for examples of living things interacting with one another. Can you spot a flower and a bee, moss growing on a tree, or another pair living closely together? Choose one example to draw in your nature journal, then describe how the relationship helps one or both organisms survive.

Hands-On Activity

Experiment: Cleaner Fish Simulation
Investigate how mutualism benefits both organisms using a cleaner fish and host fish analogy.

Supplies: A large bowl of water, small objects (beans or beads) to represent parasites, a spoon or tweezers, and a stopwatch.

Directions:

• Fill the bowl with water and scatter the “parasites” throughout. This represents a fish covered with parasites.
• Assign one person as the “cleaner fish” using the spoon/tweezers to pick up parasites, while another keeps time.
• How long does it take to remove all parasites? Use the stopwatch to be precise.
• Discuss how the cleaner fish benefits (a meal) and how the host fish benefits (health improvement).

Extension: Try different tools (such as chopsticks or forks) to mimic various cleaning techniques and discuss which one works best.

Kid-Friendly Research Project

Parasitic Relationship Model
Create a 3-D model that demonstrates how a parasite depends on a host for survival.

Choose a parasite to research, such as mistletoe, ticks, tapeworms, fleas, or leeches. Learn about your parasite by researching:

• what it looks like
• where it lives
• how it gets food
• which host it depends on
• how the host is affected by the relationship

Then use craft supplies such as clay, paper, pipe cleaners, paint, or recycled materials to build a 3-D model showing the parasite attached to or interacting with its host. Add labels to identify important parts and explain what is happening in the relationship.

Finally, present your model to family or friends and explain how the parasite survives, how the host is affected, and any other interesting facts you learned during your research.

High School Extension Project

“Nature’s Partnerships” Feature Article
Research a lesser-known symbiotic relationship and write a feature article explaining how the partnership helps the organisms survive within their ecosystem.

Choose a symbiotic relationship to research. Learn about the organisms involved, what each one contributes to the relationship, how each organism benefits or is affected, and the role the partnership plays in the larger ecosystem.

Then, write a feature article as if it were being published in a science or nature magazine. Be sure to include:
• a compelling headline
• an engaging introduction
• clear explanations and interesting facts throughout the article
• a short sidebar titled “Why This Partnership Matters”

Add at least one labeled visual, such as a diagram, map, sketch, or illustration, to help readers better understand the relationship. When finished, share your article with someone else and ask for feedback.

Related Video Lesson

      

Topics Covered: symbiosis, symbiotic relationship, mutualism, mutualistic, commensalism, commensalistic, parasite, parasitism, parasitic, partner, animal relationship, plant relationship, beneficial relationship, harmful relationship, ant, aphid, whale, barnacle, tick, mosquito, human, biology, zoology, botany

Nature Journal Skills: chart-making and note-taking

Standards Alignment & Learning Record
Download the printable learning record for this lesson. It includes a lesson summary, objectives, scope and sequence, and alignment to NGSS, ELA, and other applicable standards—perfect for documentation, planning, or proof of learning.