The Class 9 Science Chapter 2 Cell Worksheet with Answers PDF is designed to help students practice and revise the important concepts of the chapter Cell: The Building Block of Life. This worksheet includes different types of written questions that improve understanding of cell structure, functions of cell organelles, and important biological processes.
These Worksheets are useful for students who want extra practice after completing the NCERT chapter. By solving these questions, students can improve their answer-writing skills and prepare better for school tests and examinations.
Our Class 9 Worksheets are created according to the latest syllabus followed by the CBSE Board. This chapter-wise practice resource contains short answer questions, long answer questions, difference-based questions, and competency-based questions.
Students can also explore more Class 9 Science Worksheets for other chapters to strengthen their Science concepts through regular practice. Download the worksheet PDF, solve the questions carefully, and use the provided answers for self-assessment.
Download Class 9 Cell Worksheet PDF with Answers
Students can download the Class 9 Science Chapter 2 Cell Worksheet PDF and practice questions anytime for revision. The worksheet is based on NCERT concepts and helps students check their understanding of the chapter.
Download Class 9 Science Chapter 2 Cell Worksheet with Answers PDF
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Class 9 Cell Worksheet Questions
Solve the following Class 9 Science Chapter 2 Cell worksheet questions to revise important concepts such as cell organelles, cell structure, osmosis, diffusion, and functions of different parts of a cell.
Section A: Very Short Answer Questions
Answer the following questions in brief.
1. Who discovered the cell?
2. What is known as the basic structural and functional unit of life?
3. Name the cell organelle known as the powerhouse of the cell.
4. Which part of the cell controls all cellular activities?
5. What is the outermost covering of an animal cell called?
6. Name the process by which water molecules move through a selectively permeable membrane.
7. Which cell organelle helps in protein synthesis?
8. What is the jelly-like substance present inside the cell called?
9. Name one organism having a prokaryotic cell.
10. Which cell organelle contains chlorophyll in plants?
Section B: Short Answer Questions
Write answers in 2-4 sentences.
11. Why is the cell called the Building Block of life?
12. Explain the main function of the plasma membrane.
13. What is the role of the nucleus inside a cell?
14. Why are mitochondria important for living cells?
15. What are lysosomes? Why are they called suicidal bags of the cell?
16. Explain the function of the endoplasmic reticulum.
17. What happens when a cell is placed in a concentrated salt solution?
18. Write two functions of the cell wall in plant cells.
19. How do substances move inside and outside the cell?
20. Explain the role of vacuoles in plant cells.
Section C: Difference-Based Questions
Write important differences between the following.
21. Differentiate between plant cells and animal cells.
22. Write differences between prokaryotic and eukaryotic cells.
23. Differentiate between diffusion and osmosis.
24. Write the differences between cell wall and plasma membrane.
25. Differentiate between rough endoplasmic reticulum and smooth endoplasmic reticulum.
Section D: Long Answer Questions
Answer the following questions in detail.
26. Explain the structure and functions of the nucleus.
27. Describe different cell organelles and their functions.
28. Explain how plasma membrane controls the movement of substances.
29. Write the functions of Golgi apparatus, ribosomes, and mitochondria.
30. Compare unicellular and multicellular organisms with examples.
Section E: Competency-Based Questions
Apply your understanding and answer the questions.
31. A student placed dry raisins in a bowl of water overnight. The next morning the raisins became swollen.
a) Which process caused this change?
b) Why did water enter the raisins?
c) Which property of the cell membrane is involved?
32. A cell contains a large number of mitochondria. What does this tell about the energy requirement of that cell? Explain.
33. A plant cell does not burst even after absorbing water. Which structure prevents it from bursting and how?
34. A scientist observes a cell without a well-defined nucleus. What type of cell is it? Give a reason.
35. If the plasma membrane of a cell gets damaged, how will it affect the cell?
Class 9 Cell Worksheet Answer Key with Solutions
Students can check the answers after completing the worksheet. These solutions will help students understand the correct way to write answers and improve their Science preparation.
Section A: Very Short Answer Questions
| Q.No. | Answer |
|---|---|
| 1 | Robert Hooke discovered the cell in 1665. |
| 2 | Cell is known as the basic structural and Building Block of life. |
| 3 | Mitochondria is called the powerhouse of the cell. |
| 4 | The nucleus controls all cellular activities of the cell. |
| 5 | The plasma membrane is the outermost covering of an animal cell. |
| 6 | Osmosis is the movement of water molecules through a selectively permeable membrane. |
| 7 | Ribosomes help in protein synthesis. |
| 8 | Cytoplasm is the jelly-like substance present inside the cell. |
| 9 | Bacteria is an example of an organism having a prokaryotic cell. |
| 10 | Chloroplast contains chlorophyll in plant cells. |
Section B: Short Answer Solutions
11. Cell is called the Building Block of life because all living organisms are made up of cells. All important life activities such as respiration, growth, nutrition, and reproduction take place inside cells.
12. The plasma membrane controls the movement of substances entering and leaving the cell. It allows only selected materials to pass through it, so it is known as a selectively permeable membrane.
13. The nucleus controls all the activities of the cell. It contains genetic material called DNA, which transfers characteristics from one generation to another.
14. Mitochondria are important because they produce energy required for different activities of the cell. This energy is produced in the form of ATP molecules.
15. Lysosomes are cell organelles that contain digestive enzymes. They are called suicidal bags of the cell because they can digest damaged cell parts and may even digest the entire cell under certain conditions.
16. The endoplasmic reticulum helps in the transport of materials inside the cell. Rough endoplasmic reticulum helps in protein transport, while smooth endoplasmic reticulum helps in the formation of fats.
17. When a cell is placed in a concentrated salt solution, water moves out of the cell due to osmosis. As a result, the cell shrinks. This process is known as plasmolysis in plant cells.
18. The cell wall provides strength and protection to plant cells. It also helps the cell maintain its shape and prevents bursting when excess water enters the cell.
19. Substances move inside and outside the cell through processes like diffusion and osmosis. The plasma membrane regulates this movement because it is selectively permeable.
20. Vacuoles store water, food, and other substances inside the cell. In plant cells, large vacuoles help maintain shape and provide support.
Section C: Difference-Based Questions Solutions
21.
| Plant Cell | Animal Cell |
|---|---|
| Plant cells have a cell wall. | Animal cells do not have a cell wall. |
| They contain chloroplasts for photosynthesis. | They do not contain chloroplasts. |
| A large central vacuole is present. | Small or temporary vacuoles may be present. |
| Plant cells usually have a fixed shape. | Animal cells usually have an irregular shape. |
22.
| Prokaryotic Cell | Eukaryotic Cell |
|---|---|
| It does not have a well-defined nucleus. | It has a well-defined nucleus. |
| Genetic material is not enclosed inside a nuclear membrane. | Genetic material is enclosed inside a nuclear membrane. |
| Membrane-bound organelles are absent. | Membrane-bound organelles are present. |
| Example: Bacteria | Example: Plant and animal cells |
23.
| Diffusion | Osmosis |
|---|---|
| Movement of molecules from higher concentration to lower concentration. | Movement of water molecules through a selectively permeable membrane. |
| It can occur in gases and liquids. | It occurs only in liquids. |
| A selectively permeable membrane is not required. | A selectively permeable membrane is required. |
24.
| Cell Wall | Plasma Membrane |
|---|---|
| It is the outer rigid covering of plant cells. | It is the outer covering of animal cells and present inside the cell wall of plant cells. |
| It is mainly made up of cellulose. | It is mainly made up of lipids and proteins. |
| It provides shape and protection. | It controls entry and exit of substances. |
| It is freely permeable. | It is selectively permeable. |
25.
| Rough Endoplasmic Reticulum | Smooth Endoplasmic Reticulum |
|---|---|
| It has ribosomes attached to its surface. | It does not have ribosomes on its surface. |
| It appears rough in structure. | It appears smooth in structure. |
| It helps in protein synthesis and transport. | It helps in the formation of fats and lipids. |
Section D: Long Answer Solutions
26. The nucleus is one of the most important parts of a cell. It acts as the control centre because it regulates all cellular activities.
The nucleus is surrounded by a nuclear membrane that separates it from the cytoplasm. It contains genetic material called DNA, which carries information from parents to offspring.
Important functions of the nucleus are:
It controls different activities of the cell.
It helps in cell division.
It stores genetic information.
It controls growth and reproduction of cells.
Due to these important functions, the nucleus is also called the brain of the cell.
27. A cell contains many small structures called cell organelles. Each organelle performs a specific function necessary for the survival of the cell.
Important cell organelles and their functions are:
| Cell Organelle | Function |
|---|---|
| Nucleus | Controls cell activities and stores genetic information. |
| Mitochondria | Produces energy for the cell in the form of ATP. |
| Ribosomes | Helps in protein synthesis. |
| Endoplasmic Reticulum | Transports materials inside the cell. |
| Golgi Apparatus | Stores, modifies, and packages substances. |
| Lysosomes | Digest waste materials and damaged cell parts. |
| Vacuoles | Store water, food, and other substances. |
| Plastids | Help in photosynthesis and storage in plant cells. |
All these organelles work together to keep the cell alive and functional.
28. The plasma membrane is a thin outer covering of the cell that separates the internal parts of the cell from the outside environment.
It controls the movement of substances because it allows only selected materials to enter and leave the cell. Therefore, it is called a selectively permeable membrane.
The plasma membrane helps in:
Taking useful substances inside the cell
Removing waste materials from the cell
Maintaining the internal environment of the cell
Protecting cell contents
Processes like diffusion and osmosis help substances move through the plasma membrane.
29. Golgi apparatus, ribosomes, and mitochondria are important cell organelles that perform different functions.
The Golgi apparatus helps in storing, modifying, and packaging materials produced inside the cell. It also helps in the formation of lysosomes.
Ribosomes are responsible for making proteins required by the cell. They may be found freely in the cytoplasm or attached to the endoplasmic reticulum.
Mitochondria produce energy required for various cellular activities. They release energy in the form of ATP and are known as the powerhouse of the cell.
Together, these organelles help the cell perform important life processes.
30. Living organisms can be unicellular or multicellular depending on the number of cells present in their body.
Unicellular organisms are made up of only one cell. A single cell performs all necessary life activities such as respiration, digestion, and reproduction. Examples include Amoeba and bacteria.
Multicellular organisms are made up of many cells. Different groups of cells perform different functions in these organisms. Examples include humans, animals, and plants.
In multicellular organisms, division of work among different cells helps the organism function more efficiently.
Section E: Competency-Based Questions Solutions
31. a) Process involved:
The process responsible for swelling of raisins is osmosis.
b) Reason:
Water enters the raisins because the concentration of water is higher outside than inside the raisins. Water molecules move through the selectively permeable membrane into the raisins.
c) Cell structure involved:
The plasma membrane controls the movement of water molecules.
32. A cell having a large number of mitochondria requires more energy to perform its activities.
Mitochondria produce ATP, which provides energy for cellular functions. Cells that perform more work, such as muscle cells, need more mitochondria to meet their high energy requirements.
33. A plant cell does not burst after absorbing water because it has a strong cell wall.
The cell wall provides support and protection. When water enters the plant cell, the cell wall creates pressure that prevents the cell from bursting and helps maintain its shape.
34. The cell without a well-defined nucleus is a prokaryotic cell.
In prokaryotic cells, genetic material is not surrounded by a nuclear membrane. These cells also lack membrane-bound organelles. Bacteria are common examples of prokaryotic cells.
35. If the plasma membrane gets damaged, the cell will not be able to control the movement of substances.
Useful materials may move out, and harmful substances may enter the cell. This can disturb normal cell activities and may finally lead to the death of the cell.
Concepts Covered in Cell Worksheet
This Class 9 Science Chapter 2 Cell Worksheet with Answers covers the following important topics:
✓ Discovery of cell
✓ Cell as the basic unit of life
✓ Structure and functions of cells
✓ Plasma membrane
✓ Cell wall
✓ Cytoplasm
✓ Nucleus
✓ Prokaryotic and eukaryotic cells
✓ Cell organelles and their functions
✓ Endoplasmic reticulum
✓ Golgi apparatus
✓ Lysosomes
✓ Mitochondria
✓ Plastids
✓ Vacuoles
✓ Diffusion and osmosis
✓ Plant and animal cell comparison
Learning Outcomes After Solving this Worksheet
After completing this Class 9 Science Cell worksheet, students will be able to:
- Understand the structure and functions of a cell
- Explain the importance of different cell organelles
- Identify differences between different types of cells
- Understand processes like diffusion and osmosis
- Improve Science answer-writing skills
- Practice CBSE-style competency-based questions
- Prepare effectively for classroom assessments
