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Grade 2 · lesson 2 of 4

Compare seed movement structures

Compare seed movement structures using supplied evidence and a solved model.

About 12 minutes, plus any extended practice

Download the grade pack

Supplied materials

  • For younger learners, an adult may read each direction aloud; pointing, drawing and spoken explanations count as responses.
  • Paper, drawing space or a browser document.
  • Reference card A: can help wind carry the seed. Reference card B: can attach the seed to animal fur.
  • Assessment case 1: Which scientific label fits the specifically described step or feature? Supplied case: Flat wing catches moving air.
  • Assessment case 2: Which scientific label fits the specifically described step or feature? Supplied case: Burr attaches to fur.
  • Assessment case 3: Which scientific label fits the specifically described step or feature? Supplied case: Animal eats fruit containing seeds.
  • Assessment case 4: Which scientific label fits the specifically described step or feature? Supplied case: Seed remains on water surface.
  • Assessment case 5: Which scientific label fits the specifically described step or feature? Supplied case: Tiny hook catches a coat.
  • Assessment case 6: Which scientific label fits the specifically described step or feature? Supplied case: Winged seed travels with wind.

Learn the idea

Seed structures can help movement. Use the supplied function cards; not every seed uses the same method. A model can show movement without putting seeds outdoors.

Wing means can help wind carry the seed. Hook means can attach the seed to animal fur. Fleshy fruit means can encourage animal eating and seed movement. Floating coat means can support movement on water.

For wing, look for the clue “can help wind carry the seed.” For hook, look for “can attach the seed to animal fur.” More than one process can happen in a real situation. Answer about the one described in this question.

  1. Read or listen to the four science words and what each means. Say how the first two differ.
  2. Choose two of the short cases. Point to the clue that helps you choose a science word for each one. You may draw or say your answer.
  3. Answer each practice question. Say which clue helped you, then check the explanation.
  4. Use the extra task to make two examples that show different science words. Draw or say what makes each one fit.
Worked example

See the method in action

Worked reference-card problem: a card states “can help wind carry the seed”; a second states “can attach the seed to animal fur.” The first fits wing and the second fits hook. The reason is the described function or change, not the order of the cards or a favorite name. If their descriptions exchange places, their category labels exchange too. Keep the supplied descriptions attached to the correct case.

Your turn

Check your reasoning

Your answer is temporary and is not saved to an account. Download your current answer before leaving or reloading. Written work on paper or in another app stays in your own file.

Helpful tips
  • Use the feature “can help wind carry the seed” to justify wing; do not sort by the name alone.
  • Distinguish hook (can attach the seed to animal fur) from a different process occurring in the same situation.
Which scientific label fits the specifically described step or feature? Supplied case: Flat wing catches moving air.

Feedback appears here after you check. This is practice, not a graded school assessment.

See the answer and explanation

wing

The answer is wing. In the notes, it means “can help wind carry the seed.” Seed structures can help movement. Use the supplied function cards; not every seed uses the same method. A model can show movement without putting seeds outdoors.

Take it further

Create one new case showing wing and one showing hook. Expected: the first explicitly shows “can help wind carry the seed”; the second explicitly shows “can attach the seed to animal fur.” Explain the distinction by drawing, speaking or writing. A label without a matching feature is incomplete.

Nothing here is saved to an account or sent to a teacher. The answer download includes your current choice and any checked feedback. It does not include choices from the separate More practice section. Download that section separately.

More practice: try new cases

Choose an answer for each problem. Explain your method on paper, then use the feedback to decide what to revisit.

More practice: try new cases
1. Which scientific label fits the specifically described step or feature? Supplied case: Burr attaches to fur.
Need a hint?
  • Look for the described feature: can attach the seed to animal fur.
  • Compare the clue with each science word. Use only what the case tells you; do not add a new event.
2. Which scientific label fits the specifically described step or feature? Supplied case: Animal eats fruit containing seeds.
Need a hint?
  • Look for the described feature: can encourage animal eating and seed movement.
  • Compare the clue with each science word. Use only what the case tells you; do not add a new event.
3. Which scientific label fits the specifically described step or feature? Supplied case: Seed remains on water surface.
Need a hint?
  • Look for the described feature: can support movement on water.
  • Compare the clue with each science word. Use only what the case tells you; do not add a new event.

Your choices are temporary. Feedback appears after you check all the answers.

Nothing here is saved to an account or sent to a teacher. Keep your own notes or download them before leaving. The score describes these questions; it does not certify subject mastery.

Check the subject sources

These LifeStarter passages, scenarios and exercises are authored for this Academy with AI assistance and review. External resources keep their publishers’ terms. A grade label suggests a starting level; it does not establish alignment with your school’s complete requirements.