Biology Keystone

Nitrogen in the atmosphere is not available. Free nitrogen has to be changed into a usable form in a process called ____

• nitrogen fixation

• transpiration

• photosynthesis

• cellular respiration

A species that plays a critical role in the health, maintenance, growth, or definition of an ecosystem.

• keystone

• invasive

• engineer

• predator

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-5

Why are bees considered a keystone species?

• The honey they make supports the bear population

• They pollinate flowers that produce fruit which supports the ecosystem

• They sting when threatened

• They live in hives

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-4

NGSS.MS-LS2-5

Which one of the following keystone examples is a keystone predator found in the tidal pools of northwestern North America and was the species that launched Robert Paine’s keystone species concept?

• starfish

• sea otters

• beavers

• wolves

• elephants

Based on the graph shown, how can you tell sea otters are a keystone species?

• as the sea otter population decreases, biodiversity increases

• as sea otter population increases, biodiversity increases

• changes in the sea otter population have little effect on biodiversity 

• the sea otter population dereases due to the presence of urchins

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

Why are some sharks considered a keystone species?

• Because they are a top predator

• They scare off smaller fish that may overgraze an area of sea grass

• They are tertiary consumers

• They are cartilaginous

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-4

Which one of the following keystone examples play a vital role in the health of coastal kelp forests?

• starfish

• sea otters

• beavers

• wolves

• elephants

Tags

NGSS.MS-LS2-4

What is an advantage of using indicator species as a method of determining pollution?

• Cheap

• Easy to do

• Does not require specialist equipment

• All of the above

What is a disadvantage of using indicator species as a method of determining levels of pollution

• Requires specialist equipment

• Time consuming

• Difficult to do

• Does not tell us how much pollution there is

A life form that is very sensitive to environmental changes in its ecosystem. They can give us early-warning messages that a habitat is suffering.

• Indicator Species

• Flagship Species

• Predators

• Ecosystem Engineers