Ecosystems Review

Which of the following diagrams best show how population, community, and ecosystem interrelate?

• 
• 
• 
• 

Answer explanation

Population is all of the organisms of ONE species (TREES)

Community is multiple populations (TREES and DEER)

Ecosystem is LIVING and NONLIVING things (TREES, DEER, and WATER)

Tags

NGSS.MS-LS2-2

Which of these is the best example of different organisms interacting in an ecosystem?

• a cheetah running across the grasslands

• a frog catching a fly

• an elephant drinking water

• a lizard sleeping on a rock

Answer explanation

A frog catching a fly is the only example of two ORGANISMS (living things) interacting with each other.

Tags

NGSS.MS-LS2-2

Draw a line from each vocabulary word to its matching definition.

Answer explanation

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NGSS.MS-LS2-4

NGSS.MS-LS2-5

Which food chain shows one complete pathway in this food web?

• grains -> mice -> foxes

• grasses -> rabbits

  -> birds

• grains -> birds -> owls

• grasses -> grasshoppers -> birds

Answer explanation

grasses -> grasshoppers -> birds is the only path that is connected to one another

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-3

The seals in this food web would be MOST affected by a decrease in what organism

• seagull

• whale

• plankton

• penguin

Answer explanation

If the penguin population decreases, seals can still eat krill and squid. If the plankton population decreases, the penguin, seal, and squid population will all be affected.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which of these populations would be DIRECTLY affected if Acacia trees stop growing?

• giraffe

• grass

• dung beetle

• cheetah

Answer explanation

The giraffe is the next link in the food chain that follows the Acacia tree, so the giraffes would be directly affected.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Check ALL of the statements that answer the question

Which statements describe an organism interacting with a nonliving factor in its habitat?

• a butterfly carries pollen from one flower to another

• a fox drinks from a river

• a mole digs tunnels through soil

• a bear catches a fish for food

• a bird builds a nest in a tree

Answer explanation

The fox is a living thing, water is nonliving.

The mole is a living thing, soil is nonliving.

The other options do not describe nonliving things.

Tags

NGSS.MS-LS2-3

In a garden, a bee's niche is to...

• pollinate flowers

• decompose dead organisms

• eat butterflies

• bury seeds in the soil

Answer explanation

A bee's niche (role/job) is to pollinate flowers.

A hedgehog is an animal that eats both plants and animals. Their niche in an ecosystem is a

• herbivore

• producer

• carnivore

• omnivore

Answer explanation

Omnivores are animals that eat both plants and animals.

Use the dichotomous key to identify Bird W

• Certhidea

• Geospiza

• Camarhynchus

• Platyspiza

Answer explanation

The beak is relatively stout and heavy (step 2)

The bottom surface of the beak is flat and straight (Geospiza)