Symbiosis Review Lesson

What do you call a close relationship between two different species?

• symbiosis

• friendship

• community

• coevolution

Answer explanation

Symbiotic relationships are all the different types of close relationships between different species.

Symbiotic relationships ​ (a)   biodiversity​ because, often, the different species support each other to thrive and survive.

• increase
• decrease

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Match the following types of relationships to their descriptions:

• Commensalism

• One organism benefits at the expense of the other

• Mutualism

• Both organisms are harmed by fighting over a resource

• Parasitism

• Both organisms benefit (help each other)

• Competition

• One organism benefits while the other remains neutral

​ (a)   is a common type of symbiosis because all the species involved benefit. For example, a hummingbird drinks ​ (b)   from a flower, gaining food. The flower is ​ (c)   by the bird. Both species help each other.

• Mutualism
• nectar
• pollenated
• Parasitism

Macaws (a large, tropical bird) have strong beaks that can bit through thick shells. They are messy eaters, often opening nuts and droping them on the ground, leaving them behind. Other animals eat the dropped food. What type of relationship is this?

• commensalism

• parasitism

• mutualism

• competition

Answer explanation

Commensalism is when one species benefits (the animals eating the dropped food) while the other is neutral (the Macaw).

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NGSS.MS-LS2-2

In ​ (a)   , one species harms another species to benefit themselves. For example, a flea bites a dog to get ​ (b)   . This leaves the ​ (c)   with itchy bite marks.

• parasitism
• food
• dog
• commensalism
• flea

Match the following types of relationships to their descriptions:

• Mutualism

• 
• Competition

• 
• Parasitism

• 
• Commensalism

• 

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In the temperate forest, there are Autumn Olive bushes that produce berries. Cedar Waxwings eat these berries, as do Woodland Voles. Woodland voles are eaten by snakes. Snakes are eaten by Red-tailed Hawks, which are the apex predator. Identify which 2 species are in competition:

• Woodland vole

• Autumn Olive

• Cedar waxwing

• Red-tailed Hawks

Tags

NGSS.MS-LS2-2

Sloths eat cecropia trees. What kind of relationship is this?

• herbivory

• mutualism

• competition

• commensalism

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Aztec ants live in Cecropia trees. The tree provides a home for the ants and the ants protect the tree from herbivores. What kind of relationship is this?

• parasitism

• mutualism

• competition

• commensalism

Tags

NGSS.MS-LS2-2