Activity 8 Examine micrographs of plant 1. $$ \begin{array}{l} ext { Figure } 15 ext { shows plant cells from a leaf. } \ ext { These particular cells are specialised for } \ ext { photosynthesis. } \ ext { a) State Two reasons why you know } \ ext { this micrograph shows plant cells. } \ ext { hat cover } \ ext { gans and } \ ext { b) } \ ext { Draw two whole cells of leaf tissue. } \ ext { Provide your diagram with labels } \ ext { and a heading. }\end{array} $$ c) A leaf is a collection of tissues that perform a specific function. State whether a leaf is a system or an organ. Explain your answer.

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Activity 8 Examine micrographs of plant 1. $$ \begin{array}{l}	ext { Figure } 15 	ext { shows plant cells from a leaf. } \ 	ext { These particular cells are specialised for } \ 	ext { photosynthesis. } \ 	ext { a) State Two reasons why you know } \ 	ext { this micrograph shows plant cells. } \ 	ext { hat cover } \ 	ext { gans and } \ 	ext { b) } \ 	ext { Draw two whole cells of leaf tissue. } \ 	ext { Provide your diagram with labels } \ 	ext { and a heading. }\end{array} $$ c) A leaf is a collection of tissues that perform a specific function. State whether a leaf is a system or an organ. Explain your answer.

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### Activity 8: Examine Micrographs of a Plant

#### 1. Figure 15 shows plant cells from a leaf. These particular cells are specialized for photosynthesis.

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**a) State two reasons why you know this micrograph shows plant cells.**

1. **Presence of Cell Walls:**
   - Plant cells have rigid cell walls made of cellulose, which provide structural support. In the micrograph, the distinct outlines of the cells indicate the presence of cell walls, distinguishing them from animal cells that lack such structures.

2. **Presence of Chloroplasts:**
   - Chloroplasts are specialized organelles responsible for photosynthesis and contain the green pigment chlorophyll. The micrograph likely shows green, oval-shaped structures within the cells, indicating the presence of chloroplasts, which are characteristic of plant cells.

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**b) Draw two whole cells of leaf tissue. Provide your diagram with labels and a heading.**

*Since I cannot provide a visual diagram, I will describe how to draw and label two typical plant leaf cells below.*

**Heading:** Diagram of Leaf Plant Cells

**Diagram Description:**

1. **Cell Shape:**
   - Draw two rectangular or polygonal shapes to represent the rigid structure of plant cells due to the cell wall.

2. **Cell Wall:**
   - Outline the exterior of each cell with a thick line to depict the cellulose-based cell wall.

3. **Cell Membrane:**
   - Inside the cell wall, draw a thin line representing the cell membrane.

4. **Nucleus:**
   - Draw a smaller circle or oval near the center of each cell and label it "Nucleus."

5. **Chloroplasts:**
   - Inside each cell, draw oval-shaped structures containing stacked discs (thylakoids) and label them "Chloroplasts."

6. **Central Vacuole:**
   - Indicate a large, empty space within each cell, labeled "Central Vacuole," which stores water and maintains cell rigidity.

7. **Other Organelles (Optional):**
   - You may include other organelles such as mitochondria or the endoplasmic reticulum for added detail.

**Labels:**
- Cell Wall
- Cell Membrane
- Nucleus
- Chloroplasts
- Central Vacuole

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**c) A leaf is a collection of tissues that perform a specific function. State whether a leaf is a system or an organ. Explain your answer.**

A **leaf is an organ**.

**Explanation:**
An organ is a structure composed of different types of tissues working together to perform specific functions. In the case of a leaf, it consists of various tissues such as epidermal tissue, vascular tissue (xylem and phloem), mesophyll tissue (containing chloroplasts for photosynthesis), and supportive tissues. These tissues collaborate to carry out the primary function of the leaf, which is photosynthesis—converting sunlight into chemical energy. Therefore, because it is made up of multiple tissues working in unison to perform a specific task, a leaf is classified as an organ.
**a) Two reasons the micrograph shows plant cells:** 1. Presence of cell walls. 2. Presence of chloroplasts. **b) Diagram of leaf plant cells:** - Draw two rectangular cells with cell walls, cell membranes, nuclei, chloroplasts, and central vacuoles labeled accordingly. **c) A leaf is an organ because it consists of multiple tissues (like epidermal, vascular, and mesophyll) that work together to perform specific functions, such as photosynthesis.

Activity 8 Examine micrographs of plant

c) A leaf is a collection of tissues that
perform a specific function. State
whether a leaf is a system or an
organ. Explain your answer.

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Activity 8 Examine micrographs of plant c) A leaf is a collection of tissues that perform a specific function. State whether a leaf is a system or an organ. Explain your answer.