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Science lesson plan · 7th grade (Year 8 in England) · 30 minutes

Specialised cells

Cells, genetics and evolution

CCSS NGSS.MS-LS1-2CCSS NGSS.HS-LS1-2England: KS3 Biology: Cells and organisationEngland: KS4 Combined Science: Cell biology

Objective and success criteria

Students will: Specialised cells.

  • 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: Plant and animal cells

Leads to: Stem cells and their medical uses

Materials: Microscope images or slides, Cell diagrams, Mini whiteboards, A diagram or short video clip of the idea, Printed student sheet (below).

Warm-up · 4 min

  • Quick retrieval from earlier learning (Plant and animal cells). Students answer on mini whiteboards.
  • Show answers together and note who needs support in the main task.
  1. Which part of a cell is where aerobic respiration happens? (cell wall / mitochondria / chloroplasts / nucleus) → mitochondriaPrompt: Think about which parts are only in plant cells.
  2. Cells: which statement is NOT true? (Only animal cells have mitochondria. / Both plant and animal cells have a nucleus, cytoplasm and a cell membrane. / Chloroplasts are found in plant cells, not animal cells. / Most plant cells have a large permanent vacuole.) → Only animal cells have mitochondria.Prompt: Do plant cells respire?
  3. Which part of a cell is made of cellulose? (nucleus / mitochondria / cell wall / chloroplasts) → cell wallPrompt: Think about which parts are only in plant cells.

Hook · 3 min

  • Show a microscope image of cells and ask what students think they are looking at.
  • Share the objective: Specialised cells. Read the success criteria together.

I do: model it · 7 min

  • Work through the example out loud, saying why you do each step, not just what you do.
  • Example: Which specialised cell has no nucleus, leaving more room for haemoglobin (hemoglobin)?
  • Step 1: Red blood cells have no nucleus and are full of haemoglobin (hemoglobin) to carry oxygen.
  • Step 2: So the answer is: red blood cell
  • Answer: red blood cell
  • Pause after each step and ask a student to say what comes next.

We do: guided practice · 6 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. Which specialised cell is a biconcave disc to carry oxygen? (nerve cell (neurone) / palisade cell / sperm cell / red blood cell) → red blood cellPrompt: What job would need this feature?
  2. What does it mean when a cell differentiates? (It becomes specialised for a particular job. / It dies. / It divides into four cells. / It loses all its DNA.) → It becomes specialised for a particular job.Prompt: Stem cells can do this.

You do: independent practice · 7 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 6 questions are on the student sheet below, with answers in the key.

Exit ticket · 3 min

  • Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.
  1. Specialised cells: which statement is true? (All cells in the body look the same. / Root hair cells contain lots of chloroplasts. / Stem cells can develop into many different types of cell. / Sperm cells have no mitochondria.) → Stem cells can develop into many different types of cell.Prompt: Match each cell's features to its job.
  2. Which specialised cell is a biconcave disc to carry oxygen? (sperm cell / nerve cell (neurone) / red blood cell / palisade cell) → red blood cellPrompt: What job would need this feature?

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: Plant and animal cells.
  • Use concrete materials: microscope images or slides.
  • 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: Stem cells and their medical uses.
  • 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-7.

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

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Specialised cells

Name

Date

Score/ 6

  1. Question 1

    Which specialised cell is very long to carry impulses around the body?

    • A. sperm cell
    • B. red blood cell
    • C. nerve cell (neurone)
    • D. root hair cell

  2. Question 2

    Specialised cells: which statement is true?

    • A. Sperm cells have no mitochondria.
    • B. Stem cells can develop into many different types of cell.
    • C. Root hair cells contain lots of chloroplasts.
    • D. All cells in the body look the same.

  3. Question 3

    What does it mean when a cell differentiates?

    • A. It becomes specialised for a particular job.
    • B. It loses all its DNA.
    • C. It divides into four cells.
    • D. It dies.

  4. Question 4

    Which specialised cell has no nucleus, leaving more room for haemoglobin (hemoglobin)?

    • A. root hair cell
    • B. nerve cell (neurone)
    • C. red blood cell
    • D. palisade cell

  5. Question 5

    Why do muscle cells contain many mitochondria?

    • A. to make chlorophyll
    • B. to store water
    • C. to release lots of energy for contraction
    • D. to carry oxygen

  6. Question 6

    What do ciliated cells in the airways do?

    • A. make sperm
    • B. move mucus and trapped dirt away from the lungs
    • C. carry oxygen in the blood
    • D. absorb food

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Answer key: Specialised cells

  1. 1. C. nerve cell (neurone)

  2. 2. B. Stem cells can develop into many different types of cell.

  3. 3. A. It becomes specialised for a particular job.

  4. 4. C. red blood cell

  5. 5. C. to release lots of energy for contraction

  6. 6. B. move mucus and trapped dirt away from the lungs