The Giant clam Challenge

Question 1 · multiple choice

Which landscape is most suitable for a wild Giant clam?

native forest, scrub, and rough farmland in New Zealand seagrass beds, mangroves, reefs, and floating vegetation savannas and woodlands near dependable water sunlit tropical coral reefs

Question 2 · multiple choice

Which description best matches the natural diet of a Giant clam?

sugars from symbiotic algae plus filtered plankton grasses and aquatic plants grass seeds, grain, and insects small insects and other arthropods

Question 3 · multiple choice

A tracking tag records the daily rhythm of a Giant clam. Which pattern is the best match?

often hunts at night but basks by day opens in daylight to expose its mantle to sunlight often hunts in dim water and surfaces frequently hunts mainly by day from vegetation

Question 4 · multiple choice

A motion camera records a Giant clam. Which description should appear in the observation notes?

swims with tail strokes and can travel far through ocean currents undulates a long anal fin to move forward or backward remains attached while slowly adjusting shell opening walks slowly, sways, and strikes suddenly with folded forelegs

Question 5 · multiple choice

Which adaptation would a biologist correctly connect to a Giant clam?

cephalic lobes funnel plankton-rich water into the mouth mound channels regulate airflow, temperature, and gases without mechanical fans semi-retractable claws add grip while the tail helps steer mantle tissues house algae that photosynthesise and share nutrients

Question 6 · multiple choice

What would a researcher most reasonably record during the breeding cycle of a Giant clam?

releases eggs and sperm into the water during synchronised spawning many release eggs and sperm into water where larvae drift a newborn drops safely to the ground during a standing birth kits are born furred and remain with their family for about two years

Question 7 · multiple choice

How is a Giant clam most likely to organise its everyday social life?

pairs defend cliff or building territories adults are stationary but live within busy reef communities basks in groups but males defend display areas during breeding adults meet briefly to mate using scent signals

Question 8 · multiple choice

A habitat manager explains why the Giant clam matters. Which explanation is accurate?

grazes wetland plants and provides prey for large predators eats weed seeds and insects in agricultural landscapes filters water and builds calcium-carbonate habitat transfers energy from flying insects to stream food webs

Question 9 · multiple choice

Which field observation would show a Giant clam defending itself?

runs into cover and kicks with strong legs blends with plants and grips tightly during currents uses size, tusks, group protection, and warning charges closes thick shell valves when disturbed

Question 10 · true false

True or False: A giant clam produces cleaner, more alkaline sand that can locally benefit reef chemistry.

True False