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Science lesson plan · 5th grade (Year 6 in England) · 45 minutes

Decomposers and recycling nutrients

Ecosystems and food chains

CCSS NGSS.5-LS2-1CCSS NGSS.MS-LS2-3England: KS3 Biology: Interactions and interdependencies

Objective and success criteria

Students will: Decomposers and recycling nutrients.

  • I can answer questions on today's skill on my own, without help.
  • I can explain each step and say why it works.
  • I can check my answer and spot a mistake.

Before and after

Needs first: Producers, consumers, predators and prey

Leads to: The carbon cycle; The greenhouse effect and climate change; Microorganisms: helpful and harmful

Materials: Food web cards, Arrows to build chains, Mini whiteboards, A diagram or short video clip of the idea, Printed student sheet (below).

Warm-up · 5 min

  • Quick retrieval from earlier learning (Producers, consumers, predators and prey). Students answer on mini whiteboards.
  • Show answers together and note who needs support in the main task.
  1. grass → rabbit → fox What is the rabbit in this food chain? (primary consumer / secondary consumer / tertiary consumer / producer) → primary consumerPrompt: Start at the plant and count the arrows.
  2. grass → zebra → lion Which animal is the predator of the zebra? (lion / zebra / grass) → lionPrompt: A predator hunts and eats other animals; its prey is the animal it eats.
  3. Food chains: which statement is true? (Producers eat consumers. / Plants are producers because they make their own food. / Herbivores are predators. / A food chain can start with a lion.) → Plants are producers because they make their own food.Prompt: Producers make food; consumers eat.

Hook · 5 min

  • Show a food web and ask what would happen if one animal disappeared.
  • Share the objective: Decomposers and recycling nutrients. Read the success criteria together.

I do: model it · 10 min

  • Work through the example out loud, saying why you do each step, not just what you do.
  • Example: Which of these is a decomposer?
  • Step 1: Fungi and bacteria are the main decomposers.
  • Step 2: So the answer is: mushroom (fungus)
  • Answer: mushroom (fungus)
  • Pause after each step and ask a student to say what comes next.

We do: guided practice · 10 min

  • Do these together. Students try each step on whiteboards before you reveal it.
  • Use the hints as prompts rather than giving the answer.
  1. What do decomposers do? (hunt living animals / pollinate flowers / make food from sunlight / break down dead plants and animals) → break down dead plants and animalsPrompt: What happens to a fallen leaf over a few months?
  2. Is a caterpillar a producer, a consumer or a decomposer? (producer / consumer / decomposer) → consumerPrompt: Does it make food, eat living things, or break down dead things?

You do: independent practice · 10 min

  • Students work on the student sheet. Circulate and check the first two answers of every student early.
  • Students who finish: write a question of their own for a partner, with the answer.

The 8 questions are on the student sheet below, with answers in the key.

Exit ticket · 5 min

  • Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.
  1. Decomposers: which statement is NOT true? (Dead leaves just disappear on their own. / Decomposition is faster when it is warm and moist. / Matter is recycled in an ecosystem. / Decomposers return nutrients to the soil.) → Dead leaves just disappear on their own.Prompt: Why do we keep food in the fridge or freezer?
  2. Why are decomposers important for plants? (They release nutrients (minerals) back into the soil / They give plants sunlight / They make plants grow faster in the dark / They eat plant pests only) → They release nutrients (minerals) back into the soilPrompt: Where do plants get minerals from?

Watch out for

  • Everyday meanings of words getting in the way of the science meaning: define key words explicitly.
  • Remembering facts without the reason: ask "why?" and "what is the evidence?"

Support and stretch

Support

  • Review first: Producers, consumers, predators and prey.
  • Use concrete materials: food web cards.
  • Give the first step of each question, or a partly worked example to finish.
  • Pair with a confident partner for the guided practice.

Stretch

  • Move on to: The carbon cycle; The greenhouse effect and climate change; Microorganisms: helpful and harmful.
  • Explain a common mistake in writing and how to fix it.
  • Write a word problem that uses today's skill, then solve a partner's.

Homework and more practice

Free online practice with hints and printable worksheets for this skill: eurekami.com/science/grade-5.

Free lesson plan from eurekami.com/lesson-plan-builder

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Decomposers and recycling nutrients

Name

Date

Score/ 8

  1. Question 1

    Decomposers: which statement is NOT true?

    • A. Decomposition is faster when it is warm and moist.
    • B. Fungi are plants.
    • C. Decomposers return nutrients to the soil.
    • D. Matter is recycled in an ecosystem.
  2. Question 2

    Is a oak tree a producer, a consumer or a decomposer?

    • A. producer
    • B. consumer
    • C. decomposer
  3. Question 3

    Compost heaps rot faster when they are…

    • A. warm, moist and have air
    • B. completely dry
    • C. sealed in plastic with no air
    • D. frozen
  4. Question 4

    Is a soil bacteria a producer, a consumer or a decomposer?

    • A. producer
    • B. consumer
    • C. decomposer
  5. Question 5

    Which of these is a decomposer?

    • A. rabbit
    • B. mushroom (fungus)
    • C. oak tree
    • D. hawk
  6. Question 6

    Is a shark a producer, a consumer or a decomposer?

    • A. producer
    • B. consumer
    • C. decomposer
  7. Question 7

    Why are decomposers important for plants?

    • A. They eat plant pests only
    • B. They give plants sunlight
    • C. They make plants grow faster in the dark
    • D. They release nutrients (minerals) back into the soil
  8. Question 8

    Is a grass a producer, a consumer or a decomposer?

    • A. producer
    • B. consumer
    • C. decomposer

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Answer key: Decomposers and recycling nutrients

  1. 1. B. Fungi are plants.

  2. 2. A. producer

  3. 3. A. warm, moist and have air

  4. 4. C. decomposer

  5. 5. B. mushroom (fungus)

  6. 6. B. consumer

  7. 7. D. They release nutrients (minerals) back into the soil

  8. 8. A. producer