Levels of Organization Practice - Free Printable

Let's solve the problem step by step using Figure 1 and Table 1 provided in the worksheet.

---

Question 1: Identify two terms that describe components that are smaller than cells and four that are larger than cells.

We refer to Table 1 and Figure 1 to determine the levels of organization:

#### Levels from smallest to largest:
- Atom
- Molecule
- Cell
- Tissue
- Organ
- Organ system
- Organism

So:

#### Smaller than a cell:
a. Atom
b. Molecule

> These are subcellular components. Atoms combine to form molecules, which are building blocks for cells.

#### Larger than a cell:
a. Tissue
b. Organ
c. Organ system
d. Organism

> Cells group together to form tissues; tissues form organs; organs work together in organ systems; and all organ systems make up an organism.

---

✔ Answer to Question 1:

| Smaller than a cell | Larger than a cell |
|---------------------|--------------------|
| a. Atom | a. Tissue |
| b. Molecule | b. Organ |
| | c. Organ system |
| | d. Organism |

---

Question 2: Classify and label the following images with the correct level of organization.

Now, let’s analyze each image from left to right:

1. Skeleton (skull and bones)
→ This is a skeletal system, which is part of an organ system.
✔ Level: Organ system

2. Single cell with nucleus and organelles
→ This is a typical animal cell (e.g., human cell).
✔ Level: Cell

3. Heart with chambers and valves
→ The heart is an organ made of muscle tissue, connective tissue, etc.
✔ Level: Organ

4. Human body (full figure)
→ This represents the entire living person.
✔ Level: Organism

5. Layer of cells with nuclei (epithelial-like)
→ This shows a group of similar cells forming a structure — this is tissue.
✔ Level: Tissue

6. Glucose molecule (chemical structure shown)
→ Glucose is a molecule made of atoms (C, H, O).
✔ Level: Molecule

---

✔ Answer to Question 2:

| Image 1 (Skeleton) | Image 2 (Cell) | Image 3 (Heart) | Image 4 (Human body) | Image 5 (Tissue) | Image 6 (Glucose) |
|--------------------|----------------|------------------|-----------------------|-------------------|--------------------|
| Organ system | Cell | Organ | Organism | Tissue | Molecule |

---

✔ Final Answers:

#### Question 1:
| Smaller than a cell | Larger than a cell |
|---------------------|--------------------|
| a. Atom | a. Tissue |
| b. Molecule | b. Organ |
| | c. Organ system |
| | d. Organism |

#### Question 2:
From left to right:
1. Organ system
2. Cell
3. Organ
4. Organism
5. Tissue
6. Molecule

---

This completes the worksheet! Let me know if you'd like a printable version or explanation for any part.