Many octopus species live in shallow waters in coral reefs. They feed on worms, crabs, small fish, shrimp and shellfish. Identify the direct source of the energy that octopuses need to power their body functions.

How do corals gain energy and nutrition? Select ALL correct optionsThey absorb heat from water and convert it into glucose.1They hunt fish by snaring them with a poison dart.2They gain energy from symbiotic algae that photosynthesise.3They filter feed on plankton.

What do corals use their tentacles for? Defending themselves from parrot fish.1Cleaning the hard parts of their structures.2Catching tiny organisms called plankton.3Defending themselves from turtles.4

Consider the marine food chain shown above. Butterflyfish get energy by consuming seaweed and the stored energy it contains.Identify which of the following can happen to the energy obtained by the butterflyfish.It can be used by the butterflyfish through cellular respirationIt can be stored in the body of the butterflyfishIt can be lost as heat or waste to the environmentIt can be passed on to a shark as foodI'm not sure

Coral reefs are home to hundreds of thousands, if not millions, of species. This makes them some of the most biodiverse places on Earth. They also directly support around 500 million people across the world. How do they do this? Select all that apply.They protect people from floods and stormsThey provide income to countries from tourismThey are a source of fuel for many people living on the coast

Which organisms below have a symbiotic relationship and together create living reefs?Multiple choice question.Plants and fungiColonial animals (coral polyps) and photosynthetic algaeFish, eels, and marine planktonEchinoderms and chemosynthetic autotrophs