Understanding Commensalism

The video explains the concept of commensalism, a type of symbiotic relationship where one organism benefits while the other is mostly unaffected. It provides examples such as cattle egrets and cows, orchids and trees, remora and sharks, burdock seeds and animals, and barnacles and whales. Each example illustrates how one organism gains advantages like food, transportation, or seed dispersal, while the other remains largely unaffected.

What is the main characteristic of a commensal relationship?

• Both organisms benefit equally.

• One organism benefits while the other is harmed.

• One organism benefits while the other is mostly unaffected.

• Neither organism benefits.

How do cattle egrets benefit from their relationship with cows?

• They get milk from the cows.

• They use cows for shelter.

• They eat insects stirred up by the cows.

• They protect the cows from predators.

In the relationship between orchids and trees, what do orchids gain?

• Sunlight by attaching to the tree.

• Protection from predators.

• Nutrients from the tree's bark.

• Water from the tree's roots.

What advantage do remora fish gain by attaching to sharks?

• They protect the shark from parasites.

• They clean the shark's skin.

• They help the shark hunt.

• They gain a free ride and food scraps.

How do burdock seeds benefit from attaching to animals?

• They are dispersed to new locations.

• They receive nutrients from the animal.

• They are protected from predators.

• They gain moisture from the animal's skin.

What is the primary benefit barnacles receive from whales?

• Nutrients from the whale's skin.

• A free ride and access to plankton.

• A place to lay eggs.

• Protection from predators.

Which of the following is NOT an example of commensalism?

• Orchids and trees.

• Remora fish and sharks.

• Lions and zebras.

• Cattle egrets and cows.

What do barnacles gain from their relationship with whales?

• Protection from predators.

• A habitat to live on.

• A free ride and nutrition from plankton.

• Moisture from the whale's skin.

Which of the following best describes the relationship between burdock seeds and animals?

• Competition

• Commensalism

• Parasitism

• Mutualism