This worksheet features a detailed 3D diagram of an animal cell where students can identify organelles by matching numbers to their biological functions.

To solve this worksheet, we need to match each numbered part of the animal cell diagram with its correct name based on the function described. Let’s go step by step.

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Step 1: Understand what each number points to in the diagram (based on standard animal cell structure):

- ① → Nucleolus (inside nucleus, makes ribosomes)
- ② → Nucleus (holds DNA)
- ③ → Ribosomes (make proteins)
- → Cytoplasm (jelly-like substance holding organelles)
- ⑤ → Rough Endoplasmic Reticulum (has ribosomes, folds proteins)
- ⑥ → Golgi Apparatus (packages and ships proteins)
- ⑦ → Cytoskeleton (gives shape and support)
- ⑧ → Smooth Endoplasmic Reticulum (makes lipids, detoxifies)
- ⑨ → Mitochondria (powerhouse — makes energy from food)
- ⑩ → Lysosome (digests waste)
- ⑪ → Vesicle or sometimes Peroxisome? But looking at function #11: “involved in signal transduction between membrane and nucleus” → that’s often Vesicles or Endosomes, but more accurately, Signal Transduction Pathways involve many parts — however, in basic biology, #11 is likely referring to Vesicles carrying signals. Wait — let’s check common labeling.

Actually, let’s use standard textbook labels for animal cells:

Commonly:
- 1 = Nucleolus
- 2 = Nucleus
- 3 = Ribosome
- 4 = Cytoplasm
- 5 = Rough ER
- 6 = Golgi Body
- 7 = Cytoskeleton (microfilaments/microtubules)
- 8 = Smooth ER
- 9 = Mitochondrion
- 10 = Lysosome
- 11 = Vesicle (or sometimes Peroxisome — but function says “signal transduction” — actually, vesicles transport signaling molecules)
Wait — function #11: “involved in signal transduction between the cell membrane and the nucleus and organelles.” That’s typically done by vesicles or signaling proteins, but in cell diagrams, #11 is often a vesicle.

But let’s look again — some sources label:

- 10 = Lysosome
- 11 = Peroxisome? No — peroxisomes break down fatty acids and detoxify.

Wait — function #12: “Rids cells of waste products and scavenge metabolic building blocks.” → That’s Peroxisome or Lysosome? Actually, lysosomes digest macromolecules; peroxisomes handle toxins and fatty acids.

Standard matching:

Let’s assign based on functions given:

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Function Matching:

1. Facilitates ribosome biogenesis → Nucleolus → matches ①

2. Contains majority of cell’s DNA → Nucleus → matches ②

3. Site of protein synthesis → Ribosomes → matches ③

4. Organizes intracellular substances → Cytoplasm → matches ④

5. Production, folding, quality control, despatch of proteins → Rough Endoplasmic Reticulum → matches ⑤

6. Packages and secretes proteins → Golgi Apparatus → matches ⑥

7. Helps cells maintain shape and internal organization → Cytoskeleton → matches ⑦

8. Synthesizes lipids, plasma membranes, steroids → Smooth Endoplasmic Reticulum → matches

9. Turns energy from food into energy → Mitochondria → matches ⑨

10. Handles and gets rid of waste products → Lysosome → matches ⑩

11. Involved in signal transduction between membrane and nucleus/organelles → This is tricky. In many diagrams, #11 is a vesicle — vesicles carry signals. Sometimes it's labeled as "transport vesicle". So → Vesicle

12. Rids cells of waste and scavenges metabolic building blocks → This sounds like Peroxisome (breaks down fatty acids, detoxifies). But wait — lysosomes also do waste removal. However, function #10 already said “handles and gets rid of waste”, so #12 might be Peroxisome. Looking at diagram: #12 is small red dot near top — often peroxisomes are shown as small dots. So → Peroxisome

13. Organizes microtubules that serve as skeletal system → Centrosome / Centrioles → In diagram, #13 is yellow star-shaped structure → that’s Centrosome (contains centrioles) → organizes microtubules.

So final assignments:

1. Nucleolus
2. Nucleus
3. Ribosome
4. Cytoplasm
5. Rough Endoplasmic Reticulum
6. Golgi Apparatus
7. Cytoskeleton
8. Smooth Endoplasmic Reticulum
9. Mitochondrion
10. Lysosome
11. Vesicle
12. Peroxisome
13. Centrosome

Wait — let’s double-check #11 and #12.

In many school worksheets:

- #10 = Lysosome (waste disposal via digestion)
- #12 = Peroxisome (detoxification, breaks down hydrogen peroxide, scavenges metabolites)
- #11 = Vesicle (transports materials including signaling molecules)

Yes, that fits.

Also, #13: The centrosome organizes microtubules — yes.

Now write answers clearly.

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Final Answer:

1. Nucleolus
2. Nucleus
3. Ribosome
4. Cytoplasm
5. Rough Endoplasmic Reticulum
6. Golgi Apparatus
7. Cytoskeleton
8. Smooth Endoplasmic Reticulum
9. Mitochondrion
10. Lysosome
11. Vesicle
12. Peroxisome
13. Centrosome