Cell: The Building Block of Life-Assignments - What Have You Learned? Science Exploration Class 9 In English-CBSE Notes
Explore NCERT Solutions for Class 9 science exploration Chapter Cell: The Building Block of Life Topic Assignments - What Have You Learned? with simple explanations and free ncert solution in English.
Class 9 Science Exploration Exploration Chapter 2 Cell: The Building Block of Life Assignments - What Have You Learned?
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All Topics Chapter Cell: The Building Block of Life
- 1. Chapter Review and Key Points
- 2. Discovery of the Cell
- 3. Structure of a Cell
- 4. Cytoplasm And Cell Organelles
- 5. The Functions of Cell Organelles
- 6. Cell Theory
- 7. Assignments - What Have You Learned?
Notes
Cell: The Building Block of Life-Assignments - What Have You Learned? Science Exploration Class 9 In English-CBSE Notes
Cell: The Building Block of Life
Assignments - What Have You Learned?
Chapter 2. Cell: The Building Block of Life
This assignment is designed according to the latest CBSE competency-based pattern. It covers the complete chapter and helps students strengthen conceptual understanding, application skills and analytical thinking.
Chapter Assignment
1. One Word Answer
- The basic structural and functional unit of life.
- The scientist who first observed cork cells.
- The instrument used to observe microscopic cells.
- The living outer covering of the cell.
- The rigid outer covering present in plant cells.
- The jelly-like substance inside the cell.
- The control centre of the cell.
- The powerhouse of the cell.
- The protein factory of the cell.
- The hereditary material present in the nucleus.
2. Fill in the Blanks
- Every living organism is made up of one or more __________.
- The term "Cell" was given by __________.
- The plasma membrane is __________ permeable.
- Plant cells possess a __________.
- Movement of water through a selectively permeable membrane is called __________.
- ATP is mainly produced in the __________.
- Ribosomes help in __________ synthesis.
- Genes are present on __________.
- The Golgi apparatus modifies and __________ proteins.
- New cells arise from __________ cells.
3. True or False
- All living organisms are made up of cells.
- Animal cells possess a cell wall.
- The nucleus controls all activities of the cell.
- Diffusion and osmosis are the same process.
- Mitochondria are called the powerhouse of the cell.
- Ribosomes are membrane-bound organelles.
- Chloroplasts are present in animal cells.
- Lysosomes contain digestive enzymes.
- DNA carries hereditary information.
- Cell division helps in growth and repair.
4. Match the Following
| Column A | Column B |
|---|---|
| Cell Membrane | Selectively permeable membrane |
| Cell Wall | Provides rigidity |
| Mitochondria | Energy production |
| Golgi Apparatus | Packaging and secretion |
| Ribosomes | Protein synthesis |
| Lysosomes | Intracellular digestion |
| Chloroplast | Photosynthesis |
| Nucleus | Control centre |
| DNA | Genetic material |
| Vacuole | Storage of cell sap |
5. Very Short Answer Questions
- Define a cell.
- Who discovered the cell?
- What is a microscope?
- What is the function of the plasma membrane?
- What is osmosis?
- Name any two membrane-bound organelles.
- What is the function of the nucleus?
- Why are mitochondria called the powerhouse of the cell?
- What is a chromosome?
- State one difference between plant and animal cells.
6. Short Answer Questions
- Explain the importance of the discovery of the cell.
- Describe the structure and functions of the plasma membrane.
- Differentiate between diffusion and osmosis.
- Explain the functions of the cell wall.
- Compare prokaryotic and eukaryotic cells.
- Describe the structure and functions of the nucleus.
- Write the functions of mitochondria and ribosomes.
- Explain the role of the Golgi apparatus and lysosomes.
- Describe the different types of plastids.
- Why is cell division important in living organisms?
7. Long Answer Questions
- Explain the structure of a cell with the help of labelled components.
- Describe the discovery of the cell and the development of microscopes.
- Explain the structure and functions of different cell organelles.
- Differentiate between plant cells and animal cells with suitable diagrams.
- Compare prokaryotic and eukaryotic cells with examples.
- Explain the structure and functions of the nucleus, chromosomes, DNA and genes.
- Describe the movement of substances across the plasma membrane through diffusion and osmosis.
- Explain Cell Theory and discuss its importance.
- Describe how different cell organelles work together to keep the cell alive.
- Explain the importance of cells in the organisation of living organisms.
8. Case Study Questions
Case Study – 1
A student observed onion peel under a microscope and noticed many rectangular structures with a distinct boundary and nucleus.
- Which type of cell did the student observe?
- Name the rigid outer covering present in these cells.
- Why do these cells appear rectangular?
- Which organelle controls all activities of the cell?
Case Study – 2
A potato strip placed in pure water became swollen, while another strip placed in concentrated salt solution became soft and shrank.
- Which process is demonstrated in this activity?
- Why did the potato strip swell in water?
- Why did the strip shrink in salt solution?
- Name the membrane involved in this process.
Case Study – 3
A scientist observed bacteria under a microscope and found that they lacked a membrane-bound nucleus.
- Which type of cells are bacteria?
- Why are they called prokaryotic cells?
- Name one organism with eukaryotic cells.
- State one major difference between the two cell types.
Case Study – 4
A muscle cell requires a large amount of energy to perform continuous work.
- Which organelle supplies this energy?
- What form of energy is produced?
- Why are these organelles numerous in muscle cells?
- What is the common name of this organelle?
Case Study – 5
A plant leaf appears green and prepares food in the presence of sunlight.
- Which organelle performs this function?
- Which pigment is responsible for the green colour?
- Name the process involved.
- Why is this organelle absent in animal cells?
9. Competency-Based Questions
- Why are cells called the basic structural and functional units of life?
- How did the invention of microscopes change the study of biology?
- Why is the plasma membrane called selectively permeable?
- Explain why osmosis is important for plant cells.
- How does the cell wall protect plant cells?
- Why do multicellular organisms require specialised cells?
- How do mitochondria and ribosomes work together to keep a cell alive?
- Why is the nucleus considered the control centre of the cell?
- How do genes influence inherited characteristics?
- Explain how different cell organelles coordinate to perform life processes.
10. HOTS Questions
- What problems would living organisms face if cells had no plasma membrane?
- Why are mitochondria more numerous in actively working cells than in inactive cells?
- If plant cells did not have a cell wall, how would their structure and function change?
- How would the absence of ribosomes affect the survival of a cell?
- Why are lysosomes called the "suicidal bags" of the cell? Do you think this name is justified?
- How does the structure of a cell support its function?
- Can a multicellular organism survive if its cells stop dividing? Give reasons.
- Why is the study of cells considered the foundation of modern biology?
- How do specialised organelles make a eukaryotic cell more efficient than a prokaryotic cell?
- Imagine a cell without a nucleus. Which important life processes would be affected? Explain.
All Topics Chapter Cell: The Building Block of Life
Cell: The Building Block of Life-Assignments - What Have You Learned? Science Exploration Class 9 In English-CBSE Notes
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CBSE Notes for Class 9 science exploration Chapter Cell: The Building Block of Life – Assignments - What Have You Learned?
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