Year 7 Cells Test Unit 1b worksheet - Free Printable

Problem Analysis:

The task involves labeling parts of an animal cell and a plant cell, as well as identifying the functions of specific cellular components. Let's break it down step by step.

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Part (a): Labeling the Diagrams

#### Animal Cell
1. Nucleus: The large, dark circle in the center of the animal cell.
2. Cell Membrane: The outer boundary of the cell.
3. Cytoplasm: The area inside the cell membrane but outside the nucleus.

#### Plant Cell
1. Cell Wall: The rigid outer layer surrounding the plant cell.
2. Chloroplast: The green, oval structures within the plant cell.
3. Nucleus: The large, dark circle in the center of the plant cell.
4. Cell Membrane: The inner boundary just inside the cell wall.
5. Cytoplasm: The area inside the cell membrane but outside the nucleus.

#### Labeling Summary:
- Animal Cell:
- Top: Cell Membrane
- Middle: Cytoplasm
- Bottom: Nucleus
- Plant Cell:
- Top: Cell Wall
- Middle: Chloroplast
- Bottom: Nucleus
- Inner boundary: Cell Membrane
- Cytoplasm is the area inside the cell membrane but outside the nucleus.

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Part (b): Indicating the Functions of Cellular Parts

#### i. Function of the Mitochondrion
- Mitochondrion: Known as the "powerhouse of the cell," it is responsible for producing energy in the form of ATP (adenosine triphosphate) through cellular respiration.

#### ii. Function of the Vacuole
- Vacuole: In plant cells, the vacuole stores water, nutrients, waste products, and helps maintain turgor pressure to keep the cell rigid.

#### iii. Function of the Chloroplast
- Chloroplast: Contains chlorophyll and is responsible for photosynthesis, where light energy is converted into chemical energy (glucose).

#### iv. Function of the Nucleus
- Nucleus: Contains the cell's genetic material (DNA) and controls all cellular activities, including growth, metabolism, and reproduction.

#### v. Function of the Cell Membrane
- Cell Membrane: Regulates the movement of substances in and out of the cell, maintaining the internal environment and providing structural support.

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Final Answers:

#### Part (a): Labeling the Diagrams
- Animal Cell:
- Top: Cell Membrane
- Middle: Cytoplasm
- Bottom: Nucleus
- Plant Cell:
- Top: Cell Wall
- Middle: Chloroplast
- Bottom: Nucleus
- Inner boundary: Cell Membrane
- Cytoplasm is the area inside the cell membrane but outside the nucleus.

#### Part (b): Functions of Cellular Parts
i. The function of the mitochondrion is to produce energy (ATP) through cellular respiration.
ii. The function of the vacuole is to store water, nutrients, waste products, and maintain turgor pressure.
iii. The function of the chloroplast is to perform photosynthesis and convert light energy into chemical energy (glucose).
iv. The function of the nucleus is to store genetic material (DNA) and control cellular activities.
v. The function of the cell membrane is to regulate the movement of substances in and out of the cell.

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Final Answer Box:

\[
\boxed{
\text{
i. to produce energy (ATP) through cellular respiration \\
ii. to store water, nutrients, waste products, and maintain turgor pressure \\
iii. to perform photosynthesis and convert light energy into chemical energy (glucose) \\
iv. to store genetic material (DNA) and control cellular activities \\
v. to regulate the movement of substances in and out of the cell
}}
\]