CBSE Class 11 Biology Chapter 8 Important Questions - FREE PDF Download
FAQs on Important Questions for CBSE Class 11 Biology Chapter 8 - Cell The Unit of Life 2024-25
1. Why is practising important questions for Class 11 Biology Chapter 8 essential for exams?
Practising important questions helps you focus on the most critical topics as per the CBSE syllabus. It allows you to understand the types of questions asked, manage your time better in the exam, and gain confidence in complex areas like organelle functions, leading to higher scores.
2. What is the marks weightage for the unit 'Cell: Structure and Functions' in the CBSE Class 11 Biology exam 2025-26?
According to the latest CBSE syllabus for the 2025-26 session, the unit 'Cell: Structure and Functions,' which includes Chapter 8 (Cell: The Unit of Life), Chapter 9, and Chapter 10, carries a total weightage of 15 marks. This makes it a very important unit for your exams.
3. What are the most important topics in Chapter 8 that I should focus on for my exams?
For the Class 11 Biology exam, you should prioritise these topics from 'Cell: The Unit of Life':
- The structure of prokaryotic and eukaryotic cells.
- Functions of key organelles like the mitochondria, chloroplasts, and nucleus.
- The components and function of the endomembrane system (endoplasmic reticulum, Golgi apparatus, lysosomes, vacuoles).
- The structure of the plasma membrane (fluid mosaic model).
4. Are there any important diagrams I should practise from 'Cell: The Unit of Life'?
Yes, diagram-based questions are frequently asked from this chapter. You should be prepared to draw and label the following:
- A typical eukaryotic cell (plant or animal).
- The ultrastructure of a mitochondrion and a chloroplast.
- The fluid mosaic model of the plasma membrane.
- The structure of a nucleus.
Being able to draw these accurately can fetch you full marks in 3-mark or 5-mark questions.
5. How can I write a high-scoring answer for a 5-mark question from this chapter?
To score full marks in a 5-mark question, you must provide a detailed and well-structured answer. For example, if asked about the nucleus, you should:
- Start with a clear, one-sentence definition.
- Draw a neat, well-labelled diagram.
- Describe its structure point-wise (e.g., nuclear envelope, nucleoplasm, chromatin, nucleolus).
- List its key functions clearly.
- Ensure your answer is neat and uses correct biological terms.
6. What is a common mistake to avoid when answering questions about the endomembrane system?
A common mistake is to describe each organelle of the endomembrane system (ER, Golgi, lysosomes, vacuoles) in isolation. To score well, you must explain how their functions are coordinated. For instance, explain how proteins synthesised by the ER are modified by the Golgi complex and then transported via vesicles. Emphasising this coordinated workflow is key.
7. Why is understanding the difference between prokaryotic and eukaryotic cells so important for exams?
This is a fundamental concept that forms the basis for many other questions. Examiners often ask direct comparison questions (worth 3 or 5 marks) or frame application-based questions around it. A clear understanding helps you correctly identify cell types in diagrams and accurately describe features like the presence or absence of a nucleus and other membrane-bound organelles.
8. What types of questions can I expect from the topic of cell organelles in my exam?
From the topic of cell organelles, you can expect a variety of questions, including:
- MCQs: Asking to identify the 'powerhouse' or 'protein factory' of the cell.
- 2-mark questions: Asking for the specific functions of two organelles.
- 3-mark questions: Differentiating between two organelles (e.g., mitochondria and chloroplasts).
- 5-mark questions: Requiring a detailed description of an organelle with a diagram.











