online quiz unit 6 between the tides

The lower limit of the intertidal zone is the:

• intertidal zone upper limit
• subtidal zone
• lowest low tide

• high tide mark

The particular characteristic most widely used in classifying intertidal communities:

• Level of exposure to air and water
• Number of fish species
• Color of the sand
• Type of substrate.

Regarding the origin of rocky coasts, it is known that this type of shore is present along:

• Geologically young coasts.

• desert shores
• river banks
• oceanic ridges

Which of these organisms inhabits the area at or above the high tide line on a sandy beach?

• Polar bears

• Tropical fish

• Ghost crab

• Desert cacti

In a soft-bottomed intertidal community, oxygen would be most plentiful for meiofauna in which type of bottom?

• Grassy

• Rocky

• Gravel

• Muddy

The number of species in a given community can be increased by:

• Predation

• Competitive exclusion

• Disturbance and Predation only

• Disturbance

• All of the above

What organism would be most likely to be found in the upper intertidal zone of a rocky shoreline?

• Seagulls
• Sea anemones
• Encrusting algae

• Sea urchins

On Atlantic shores, the dog whelk (Nucellalapillus) has two color forms, white-shelled and brown-shelled. Survival of one form over the other form in a region appears to be related to:

• environmental factors
• genetic factors
• geographical location
• Temperature

The main source of food in muddy-bottom intertidal communities:

• organic matter

• Fish

• Detritus

• crustaceans

Fine sediments are characteristic of:

• Volcanic environments
• High energy environments
• Calm, less exposed shores

• Desert environments