Seventh Grade · Science · week 2

Organelles at work

Identify the main organelles in plant and animal cells and explain the specific job each one performs.

A cell is not an empty bag -- it is closer to a tiny factory, packed with specialized parts called organelles, each doing one job that keeps the cell alive. The nucleus is the control center, holding the cell's DNA instructions. Mitochondria are the power plants, breaking down food to release usable energy. Ribosomes are the workers building proteins from those DNA instructions. The cell membrane is the security gate, controlling exactly what enters and leaves the cell.

Plant cells have every one of those parts, plus three more that animal cells lack: a rigid cell wall outside the membrane for support and protection, chloroplasts that capture sunlight to make food (photosynthesis), and one large central vacuole that stores water and helps the cell stay firm. Animal cells have small vacuoles at most. Knowing which organelles a cell has is often enough to tell you, at a glance, whether you are looking at a plant or an animal.

📋 For the teacher
Teach it (10–15 min):
  • Draw a large circle together and label organelles as you read about each one, rather than only reading the list -- drawing forces a second pass through the meaning.
  • Use household stand-ins if it helps: a phone (nucleus, holds the key info), a battery pack (mitochondria), a front door with a lock (cell membrane).
  • Quiz plant-versus-animal by asking "which THREE organelles tell you it is a plant cell," not just "name the organelles," since that distinction is the useful takeaway.
  • Resist over-memorizing every organelle that exists; focus on the ones listed this week and what each one DOES, not just its name.
Talk about it:
  • Which organelle would a plant cell need that an animal cell does not, and why?
  • If the cell membrane let absolutely everything in and out, what problem would that cause?
  • Which organelle do you think is most like a smartphone, and why?

Mastery looks like: They can name each listed organelle's job and correctly identify a cell as plant or animal based on which organelles are present.

Common stumbles: Confusing the cell wall (rigid, plants only, outside the membrane) with the cell membrane (present in every cell); assuming every cell has chloroplasts.

Homework for this lessonType it, write it with a stylus, or print it for pencil & paper.open →
Records attendance + 15 min of Science for this learner.
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