Cell Organelles Labeling worksheet - Free Printable

Let's solve this step-by-step by identifying each labeled part of the animal cell in the diagram and matching it with the correct organelle name from the provided list.

Step 1: Understand the Diagram

This is a diagram of an animal cell, as indicated by the presence of:
- Centrioles (not found in plant cells)
- Lysosomes (common in animal cells)
- No cell wall or chloroplasts

We are given a list of organelles to choose from:
- lysosome
- rough ER
- ribosomes
- centrioles
- nucleolus
- cytoplasm
- mitochondrion
- smooth ER
- cell membrane
- Golgi Body
- nucleus
- vacuole

Now, let’s identify each labeled structure based on its appearance and location.

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Step 2: Match Each Label to the Correct Organelle

We’ll go clockwise or follow the arrows from top to bottom:

#### Top left:
- Arrow pointing to the outer boundary of the cell → This is the cell membrane.
- Small dots near the cell membrane → These are ribosomes. They are often seen free-floating or attached to the ER.
- Large purple structure in the center → This is the nucleus.
- Inside the nucleus, there's a dark spot → That’s the nucleolus.
- Stacked membranes outside the nucleus → This is the Golgi body (also called Golgi apparatus).
- Network of membranes with dots on them → The rough endoplasmic reticulum (rough ER) — because it has ribosomes attached.
- Network of membranes without dots → The smooth endoplasmic reticulum (smooth ER).
- Bean-shaped structures with inner folds → These are mitochondria.
- Large blue sac-like structure → This is the vacuole (smaller than in plant cells).
- Small round structures with spots inside → These are lysosomes.
- Tiny star-like structure near the nucleus → This is the centriole.
- The fluid-filled area surrounding the organelles → This is the cytoplasm.

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Step 3: Fill in the Labels

Now, assign the correct labels to each blank box:

1. Top arrow pointing to the outer edge → Cell membrane
2. Arrow pointing to small dots near membrane → Ribosomes
3. Arrow pointing to large central structure → Nucleus
4. Arrow pointing to dark spot inside nucleus → Nucleolus
5. Arrow pointing to stacked sacs → Golgi Body
6. Arrow pointing to folded network with dots → Rough ER
7. Arrow pointing to folded network without dots → Smooth ER
8. Arrow pointing to bean-shaped organelle → Mitochondrion
9. Arrow pointing to large blue sac → Vacuole
10. Arrow pointing to small round structure → Lysosome
11. Arrow pointing to star-like structure → Centrioles
12. Arrow pointing to background fluid → Cytoplasm

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Final Answer (Labeling):

From top to bottom, left to right:

1. Cell membrane
2. Ribosomes
3. Nucleus
4. Nucleolus
5. Golgi Body
6. Rough ER
7. Smooth ER
8. Mitochondrion
9. Vacuole
10. Lysosome
11. Centrioles
12. Cytoplasm

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Summary:

This diagram shows the major organelles in an animal cell. Each organelle has a specific function:
- Nucleus: Controls cell activities; contains DNA.
- Nucleolus: Produces ribosomes.
- Mitochondrion: Site of cellular respiration (energy production).
- Rough ER: Protein synthesis (with ribosomes).
- Smooth ER: Lipid synthesis, detoxification.
- Golgi Body: Modifies, sorts, and packages proteins.
- Lysosome: Digests waste materials.
- Vacuole: Stores water, ions, and waste (smaller in animal cells).
- Centrioles: Involved in cell division.
- Ribosomes: Synthesize proteins.
- Cell membrane: Regulates what enters and exits the cell.
- Cytoplasm: Gel-like substance where organelles float.

✔ All labels are now correctly matched!