Unit 3: Homeostasis

What is homeostasis?

• Living things that shape an ecosystem

• Maintaining balance in an ecosystem, organism or cells

• The impact of a food web falling apart once the keystone species is taken out of an ecosystem

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NGSS.MS-LS1-5

Which food web is drawn correctly?

• A- the arrows are drawn from prey 🠮 predator

• B- the arrows are drawn from prey 🠮 predator

• B- the arrows are drawn from predator 🠮 prey

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What is the relationship between species F and E?

• Species E gives energy to species F

• Species F gives energy to species E

• Species E and F are on the same level of the trophic pyramid

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NGSS.MS-LS2-3

What happens to other species in this diagram if J is removed?

• Species N will increase, species E will decrease

• Species N will decrease, species E will increase

• Both species N and E will decrease

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What is the general trend in kelp population seen between years 20-30?

• Stable

• Increasing

• Decreasing

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In the first 10 years, what did the carrying capacity of kelp appear to be?

• ~ 30,000

• ~ 29,000

• ~ 20,000

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What could be some hypotheses for why the urchin population is increasing? List BIOTIC factors!

• Temperature change, water clarity, carbon dioxide decreasing

• Decrease in predators, increase in prey

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What is a keystone species?

• The most important organism in an ecosystem

• The least important organism in an ecosystem

• Ms. Lehning is the best!!!!!!

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Is this ecosystem maintaining homeostasis?

• Yes, the amount of each organism decreases as you go up the food chain, showing a balanced ecosystem

• Yes, the amount of each organism increases as you go up the food chain, showing a balanced ecosystem

• No, there is not enough of each organism, which shows an unbalanced ecosystem

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Using the pyramid of numbers, which trophic pyramid appears to be in homeostasis?

• Year 0- the number of species decreases as you go up the pyramid allowing for each organism to meet its energy needs

• Year 30- the number of species decreases as you go up the pyramid allowing for each organism to meet its energy needs

• Year 30- the number of species increases as you go up the pyramid allowing for each organism to meet its energy needs

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