Unit 9 Biology

Why are hummingbirds good examples of showing how ecosystems are connected?

• They aren't

• They migrate from one area to another and rely on numerous ecosystems for food and shelter

• They can live in both aquatic and terrestrial ecosystems

• They are found in all gardens

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These species are the most abundant in an ecosystem.

• dominant species

• keystone species

• alien species

• invasive species

This is an ecosystem that is able to withstand any pressures and support all of the organisms within it

• ecosystem

• sustainable ecosystem

• aquatic ecosystem

• terrestrial ecosystem

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The following are the list of steps when carrying out an ecological investigation, using a quadrat: Calculate/estimate the population of the given species using your results. Repeat placing the quadrat in other randomly selected places counting the species number each time. Calculate/estimate the area of land under study. Count the number of a given species in the quadrat. Randomly decide where to place the quadrat. Measure the area of the quadrat. The correct step order is ...

• 1-2-3-4-5-6

• 6-5-4-2-1-3

• 6-5-4-3-2-1

• 6-5-4-2-3-1

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The direction of the arrows in a food web point away from the

• primary consumer to top consumer

• producer to top consumer

• top consumer to primary consumer

• top consumer to producer

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What are decomposers?

• Organisms that get their energy by breaking down dead organism or their waste product

• dead bodies and organic waste

• organisms that use energy to break down dead bodies and organic waste

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Enzymes are necessary in digestion as they ...

• produce larger molecules from smaller molecules

• move food through the digestive system

• break down larger molecules into smaller molecules

• prevent us from bacteria

Select all the apply decomposers

• are organisms that get their food from dead organisms and organic waste

• are organic waste material and dead organisms

• help to recycle substances from dead organisms and waste, so that other living organisms can use them

• include maggots, fungi, worms, fruit flies

Select all that apply: pollution affects food webs

• removing one (or more) links in a food web

• possibly adding a poison into the food web

• always increasing the number of consumers, therefore decreasing the number of producers

• changing the habitat of the ecosystem, therefore affecting food chains

• always increasing the number of producers, and decreasing the number of consumers

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How do algal blooms affect a lake ecosystem by ...

• directly preventing oxygen reaching underwater plants

• adding extra fertilizer to the lake

• producing toxins that could poison fish and other aquatic creatures

• preventing sunlight getting deep into the lake

• increasing the number of decomposers, which use up most of the dissolved oxygen in the water

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