Two Kinds of Water: teacher key

Bull Sharks, grade 7 edition, written for 7th grade. A bull shark can swim up rivers and into lakes. Read how its body handles salt, how big it grows and how its pups begin.

Read the book. Print this page for the key.

Questions and answers

1. What does a bull shark do to cope with fresh water?
   • It lowers the urea in its tissues (answer)
   • It stops swimming
   • It grows more teeth
2. Which bull sharks usually grow to about 3.6 metres?
   • Females
   • Males (answer)
   • Pups
3. What is true about the 5,914 newton bite force number?
   • It is the weight of a shark
   • It was measured on a live shark every day
   • It was calculated from a study (answer)
4. Why are bull sharks named for their shape?
   • They have a stocky shape and a broad, flat snout (answer)
   • They live on farms
   • They are the colour of bulls
5. Why can a bull shark pup swim and hunt soon after birth?
   • Pups hatch from eggs
   • Pups are well developed at birth (answer)
   • Pups are born adults
6. What does maturity mean here?
   • Being lost
   • Being born
   • Being grown up (answer)

Words

• urea: a body chemical
• maturity: being grown up
• opportunistic: eats what's there