Plant cell diagram with numbered parts for students to identify.

Let's solve the worksheet step by step.

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A. Define the term "cell".

Answer:
A cell is the smallest unit of structure and function in living organisms. It is the basic building block of all living things. Cells carry out essential life processes such as growth, reproduction, response to stimuli, and metabolism.

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B. Name the parts of the plant cell below:

We are given a labeled diagram of a plant cell with numbers 1 to 15. Let's identify each part based on standard plant cell anatomy.

Here’s the identification:

1. Chloroplast – Green organelles that carry out photosynthesis.
2. Nuclear envelope (or nuclear membrane) – The double membrane surrounding the nucleus.
3. Nucleus – Contains genetic material (DNA) and controls cell activities.
4. Cell wall – Rigid outer layer that provides support and protection.
5. Vacuole – Large central sac that stores water, ions, and waste; helps maintain turgor pressure.
6. Cytoplasm – Gel-like substance where organelles are suspended.
7. Mitochondrion – Organelle responsible for cellular respiration (produces energy).
8. Golgi apparatus – Modifies, sorts, and packages proteins and lipids.
9. Ribosome – Site of protein synthesis (small dots or granules).
10. Endoplasmic reticulum (ER) – Network of membranes involved in protein and lipid synthesis.
11. Lysosome – Contains digestive enzymes (less common in plants but present).
12. Plasma membrane (cell membrane) – Semi-permeable membrane regulating movement in and out of the cell.
13. Centriole – Involved in cell division (note: not always present in plant cells; more common in animal cells).
14. Chromatin – DNA and proteins inside the nucleus (visible during interphase).
15. Microtubule – Part of the cytoskeleton; helps maintain shape and assist in cell division.

> ⚠️ Note: Some labels may vary slightly depending on the diagram style, but this is consistent with typical plant cell diagrams.

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✔ Final Answer Key:

| Number | Part Name |
|--------|-------------------------------|
| 1 | Chloroplast |
| 2 | Nuclear envelope |
| 3 | Nucleus |
| 4 | Cell wall |
| 5 | Vacuole |
| 6 | Cytoplasm |
| 7 | Mitochondrion |
| 8 | Golgi apparatus |
| 9 | Ribosome |
| 10 | Endoplasmic reticulum (ER) |
| 11 | Lysosome |
| 12 | Plasma membrane |
| 13 | Centriole |
| 14 | Chromatin |
| 15 | Microtubule |

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✔ Explanation Summary:
- Plant cells have unique features like cell wall, chloroplasts, and a large central vacuole.
- The nucleus controls cell activity.
- Mitochondria produce energy.
- Chloroplasts perform photosynthesis.
- The cytoplasm holds all organelles.
- The plasma membrane regulates transport.
- Ribosomes make proteins.
- The Golgi apparatus modifies and packages molecules.
- ER helps in protein and lipid synthesis.
- Vacuoles store substances and maintain pressure.
- Lysosomes digest waste.
- Centrioles (though rare in plants) help in cell division.
- Microtubules aid in cell structure and movement.

This completes the worksheet! Let me know if you'd like a printable version or diagram annotations.