En anglais

Comparing animal life cycles

Science · Ecosystems & Habitats · ages 9-10

Name ______________________ Date ____________

A newborn puppy already has the basic body form of a dog.
Circle one: True False
What is a butterfly's pupa stage called?
- Tadpole
- Chrysalis
- Adult butterfly
Which list puts a chicken's main development stages in order?
- Egg, chick, adult chicken
- Chick, egg, adult chicken
- Egg, adult chicken, chick
How many of these lesson examples have metamorphosis: dog, chicken, butterfly and the pond frog described in the lesson?
Answer: ______________
A tadpole grows legs, loses its tail and develops into a frog. What is this an example of?
- Direct development
- Metamorphosis
- No real change
A grasshopper has egg, nymph and adult stages. Which comparison with a butterfly is accurate?
- Both animals have a pupa after a nymph and before the adult.
- The butterfly has no pupa; the grasshopper has a pupa.
- The grasshopper has no pupa; the butterfly has a pupa.
A newly hatched animal resembles an adult of its species. Which conclusion follows from that clue alone?
- It must be a bird because every egg produces a chick.
- It must be a mammal because only mammals resemble adults.
- The clue does not identify its animal group.
Zara says every young animal has metamorphosis because young animals grow bigger. Which reply checks her idea?
- A puppy grows without metamorphosis.
- Every animal that grows bigger must have a pupa stage.
- Only animals with metamorphosis can grow into adults.

Answer key

For grown-ups. Fold this page away before handing over the rest.

True · A puppy has a dog's basic body form. Its body still grows and matures through direct development.
Chrysalis · The chrysalis is the butterfly's pupa stage. Development continues inside it before the adult emerges.
Egg, chick, adult chicken · A chick hatches from an egg and grows into an adult chicken.
2 · The butterfly and described pond frog have metamorphosis. Dog and chicken have direct development. There are 2 examples with metamorphosis.
Metamorphosis · Growing legs and losing the tadpole tail change the animal's body form. This is metamorphosis.
The grasshopper has no pupa; the butterfly has a pupa. · Grasshoppers have incomplete metamorphosis without a pupa. Butterflies have complete metamorphosis with a pupa called a chrysalis.
The clue does not identify its animal group. · Bird chicks, grasshopper nymphs and some amphibian hatchlings can resemble adults. That resemblance does not identify one animal group.
A puppy grows without metamorphosis. · A puppy grows but has direct development. This counterexample shows that growing bigger alone does not establish metamorphosis.