Sensors Under the Snout: teacher key

Hammerhead Sharks, grade 8 edition, written for 8th grade. A hammerhead has electrical sense organs in small pores along the underside of its head. Young scalloped hammerheads spend their first two years inshore, and adults travel with the seasons.

Read the book. Print this page for the key.

Questions and answers

1. Where are a hammerhead's ampullae of Lorenzini?
   • Along the underside of its head (answer)
   • On its tail
   • Inside its eyes
2. How many living species does a 2020 study describe in the hammerhead family?
   • Two
   • Eight (answer)
   • Thirty-one
3. How long is great hammerhead gestation, according to FishBase?
   • About 6 months
   • About 2 years
   • About 11 months (answer)
4. Which hammerhead is described as solitary, rather than as traveling in large schools?
   • The great hammerhead (answer)
   • Young scalloped hammerheads
   • Adult scalloped hammerheads
5. What does nomadic mean in 'solitary, nomadic and migratory'?
   • Staying in one bay
   • Moving from place to place (answer)
   • Swimming in a school

Words

• ampullae: electric-sensing pores
• genera: groups of species
• gestation: carrying pups
• poleward: toward the poles
• nomadic: always moving