Marine Organisms Quiz

What are the main features of crustaceans?

• Notochord, dorsal neural tube, and pharyngeal slits

• Bones and jaw made of cartilage, fins, and gills

• Gills, lateral line, and scales

• Hard exoskeleton, segmented abdomen, and carapace

Which of the following is a key group of marine organisms that includes sea stars, sea urchins, sea cucumbers, and sea lilies?

• Plankton

• Echinoderm

• Cartilaginous fish

• Macroalgae

What is the ecological importance of bony fish?

• They provide nutrients to primary producers

• They are a keystone species

• They are a top predator

• They are used for jewelry and cosmetics

Which of the following is a characteristic of macroalgae?

• They are flowering plants

• They have a thick horizontal root system

• They have a well-developed root system

• They are photoautotrophs

What is the main ecological role of cartilaginous fish in food webs?

• They are a top predator

• They control invasive species

• They provide nutrients to primary producers

• They promote biodiversity

What is the main function of the gas bladders in macroalgae?

• To anchor the algae to the seabed

• To increase photosynthesis by keeping the blades in the top layer of the photic zone

• To prevent breakage of the algae

• To absorb light and minerals

Which of the following is a key group of marine organisms that includes sharks, skates, rays, and chimaeras?

• Echinoderm

• Macroalgae

• Plankton

• Cartilaginous fish

What is the main ecological role of plankton in marine ecosystems?

• They physically modify the habitat

• They provide nutrients to primary producers

• They are important consumers in the food web

• They control other species through grazing, predation, and competition

What is the main ecological role of sea cucumbers in sandy shores?

• They are used for scientific research

• They are a source of income in agriculture and fishing

• They produce nitrogenous waste for coral growth

• They filter seawater

What is the main ecological role of kelp in marine ecosystems?

• They are used for jewelry and cosmetics

• They are important food sources for marine organisms

• They are a keystone species

• They provide nutrients to primary producers