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Science Grade 2-3 Answer Key

Science: Life Cycles Butterfly Frog and Plant Comparison

Comparing how living things grow and change

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Science: Life Cycles Butterfly Frog and Plant Comparison

Comparing how living things grow and change

Science - Grade 2-3

Instructions: Read each problem carefully. Use complete sentences when you explain your thinking.
  1. 1

    Put the butterfly life cycle stages in order: adult butterfly, egg, chrysalis, caterpillar.

    Start with the stage that is laid on a leaf.

    The correct order is egg, caterpillar, chrysalis, and adult butterfly.
  2. 2

    Put the frog life cycle stages in order: adult frog, tadpole, egg, froglet.

    Start with the stage found in water as a small round egg.

    The correct order is egg, tadpole, froglet, and adult frog.
  3. 3

    Put the plant life cycle stages in order: seedling, adult plant with flower, seed, sprout.

    A plant usually begins as a seed.

    The correct order is seed, sprout, seedling, and adult plant with flower.
  4. 4

    How is a butterfly life cycle similar to a frog life cycle?

    A butterfly life cycle and a frog life cycle are similar because both animals begin as eggs and change as they grow.
  5. 5

    How is a plant life cycle different from a butterfly life cycle?

    Think about what each living thing starts as.

    A plant life cycle is different because a plant grows from a seed, while a butterfly grows from an egg and changes from a caterpillar into an adult butterfly.
  6. 6

    Which life cycle includes a tadpole: butterfly, frog, or plant?

    The frog life cycle includes a tadpole. A tadpole is a young frog that lives in water.
  7. 7

    Which life cycle includes a chrysalis: butterfly, frog, or plant?

    A chrysalis is part of insect growth.

    The butterfly life cycle includes a chrysalis. The caterpillar changes inside the chrysalis before becoming an adult butterfly.
  8. 8

    Look at these stages: egg, caterpillar, chrysalis, adult. Which living thing has this life cycle?

    A butterfly has this life cycle because it grows from an egg into a caterpillar, then forms a chrysalis, and becomes an adult butterfly.
  9. 9

    Look at these stages: seed, sprout, seedling, adult plant. Which living thing has this life cycle?

    A plant has this life cycle because it begins as a seed and grows into an adult plant.
  10. 10

    A student says, "Frogs and butterflies both look exactly like their parents when they first hatch." Is the student correct? Explain.

    Compare the young stage to the adult stage.

    The student is not correct. A tadpole does not look like an adult frog, and a caterpillar does not look like an adult butterfly.
  11. 11

    Name one thing that a seed and an egg have in common in life cycles.

    Think about the first stage of a life cycle.

    A seed and an egg are similar because both can be the beginning stage of a new living thing.
  12. 12

    Complete the comparison: A caterpillar changes into a butterfly. A tadpole changes into a ___.

    A tadpole changes into a frog. It grows legs, loses its tail, and becomes an adult frog.
  13. 13

    Draw or describe one complete life cycle from this worksheet. Include at least four stages in the correct order.

    Choose butterfly, frog, or plant, then list the stages from beginning to adult.

    One correct example is the butterfly life cycle: egg, caterpillar, chrysalis, and adult butterfly. Another correct example is the frog life cycle: egg, tadpole, froglet, and adult frog.
LivePhysics™.com Science - Grade 2-3 - Answer Key