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Cicada Shells and Lifecycle

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Cicada Shells and Lifecycle

Read the information, then solve the questions. Cicada species differ, so the time spent underground is not the same for every cicada.

A cicada’s life

Adult cicadas lay eggs in small cuts in tree branches. When the eggs hatch, tiny nymphs fall to the ground and burrow into the soil. Underground, nymphs take in nourishment from their surroundings. Depending on the species, a nymph may live underground for several years. When it is ready to become an adult, it climbs up a tree trunk or another sturdy surface. Its outer covering splits along the back, and the adult cicada climbs out. The empty, brown covering left behind is called a shell or exuvia. The adult’s wings expand and harden, and it can then fly and reproduce. Cicada shells are not the same as eggs or dead adult cicadas: they are the shed outer coverings of nymphs.

Investigate the lifecycle

Use the information above to answer each question.

1.Which sequence puts the cicada’s main life stages in the correct order?
  • Egg → nymph → adult
  • Nymph → adult → egg
  • Adult → egg → shell
2.What do cicada nymphs take in for nourishment while they are underground?
3.Complete the lifecycle clues: Adult cicadas lay in tree branches. The young that hatch are called .
4.True or false: Every cicada species spends exactly the same number of years underground.
TrueFalse
5.A nymph has climbed a tree and its outer covering has split. What happens next, and what is left on the tree?
6.The shell is empty and brown. Is it an egg, a dead adult cicada, or a shed covering? Explain your choice using one clue.
7.Put these events in order by writing 1, 2 and 3: ___ The nymph burrows into soil. ___ An egg hatches. ___ The nymph climbs up a tree to shed its covering.
8.A curious person finds a cicada shell on a tree. Give two safe, gentle ways to observe it without harming living cicadas.
9.Explain why a cicada shell is evidence that a nymph has changed as it grew.

2 printable pages

  • Cicada Shells and Lifecycle, page 1 of 2: A cicada’s life, Investigate the lifecycle

    Page 1

  • Cicada Shells and Lifecycle, page 2 of 2: 5. A nymph has climbed a tree and its outer covering has split. What happens next, and…

    Page 2

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