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CBSE Class 9 Biology Chapter 5 The Fundamental Unit of Life Worksheet with Answers

Chapter 5 of NCERT Class 9 Biology, The Fundamental Unit of Life, introduces you to the building block of all living organisms—the cell. This worksheet is carefully designed to test your grasp of cell discovery, structure, and functions through varied question types. Print it, set a 60-75 minute timer, and solve without referring to your textbook first. Then check the detailed answer key to identify gaps and strengthen your conceptual foundation before your next CBSE exam.

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Key takeaways

  • ✓Robert Hooke discovered cells in 1665; Schleiden, Schwann and Virchov formulated the Cell Theory stating all living organisms are made of cells and all cells arise from pre-existing cells.
  • ✓Prokaryotic cells lack a true nucleus and membrane-bound organelles (e.g. bacteria), while eukaryotic cells have a nucleus and organelles (e.g. plant and animal cells).
  • ✓The cell membrane is selectively permeable, controlling entry and exit of substances, while the cell wall (in plants, fungi, bacteria) provides structural support and shape.
  • ✓The nucleus is the control centre containing DNA and chromosomes, directing all cellular activities and protein synthesis.
  • ✓Mitochondria generate ATP through aerobic respiration, chloroplasts perform photosynthesis in plants, and vacuoles store water and maintain turgor pressure.
  • ✓Ribosomes synthesise proteins, the ER processes proteins and lipids, Golgi apparatus packages and distributes them, and lysosomes digest waste and foreign particles.
  • ✓This worksheet tests your understanding through 50+ questions across MCQs, short answers, long answers, and a case-study, all with detailed solutions for self-assessment.

Quick Chapter Recap: The Fundamental Unit of Life

In this chapter, you learned that cells are the smallest functional units of life, discovered by Robert Hooke in 1665 when he examined cork slices. The Cell Theory, formulated by Schleiden, Schwann, and later Virchow, states that all living organisms are composed of cells and all cells arise from pre-existing cells. Cells are broadly classified into prokaryotic (no nucleus, found in bacteria) and eukaryotic (with nucleus, found in animals, plants, fungi, protists). The plasma membrane controls what enters and exits the cell through selective permeability. Plant cells have an additional rigid cell wall made of cellulose. The nucleus houses chromosomes and DNA, controlling cellular activities. Cytoplasm contains organelles: mitochondria produce energy (ATP), ribosomes synthesise proteins, the endoplasmic reticulum processes proteins and lipids, the Golgi apparatus packages molecules, lysosomes digest waste, chloroplasts (in plants) perform photosynthesis, and vacuoles store substances and maintain turgor pressure. This recap should remind you of the key structures and their functions before you attempt the worksheet sections below.
  • Cell Theory: All organisms are made of cells; all cells come from pre-existing cells (Schleiden, Schwann, Virchow).
  • Prokaryotes: No nucleus, no membrane-bound organelles, e.g. bacteria.
  • Eukaryotes: True nucleus, complex organelles, e.g. plant and animal cells.
  • Plasma membrane: Selectively permeable barrier; controls transport.
  • Cell wall: Rigid, made of cellulose in plants; provides shape and support.
  • Nucleus: Contains DNA and chromosomes; controls cell activities.
  • Mitochondria: Powerhouse; produces ATP via respiration.
  • Chloroplasts: Site of photosynthesis in plant cells.
  • Vacuoles: Store water, nutrients; maintain turgor in plants.

Section A: Multiple Choice Questions (MCQs)

This section contains 8 MCQs designed to test your recall and conceptual understanding of cell structure, discovery, and organelle functions. Each question has four options; choose the most accurate one. These MCQs mirror the style of objective questions frequently asked in CBSE Class 9 term exams and competitive scholarship tests. Attempt all questions carefully, as even small keywords like 'selectively permeable' or 'peptidoglycan' matter. Mark your answers on a separate sheet, then cross-check with the answer key at the end. Each correct answer in Section A typically carries 1 mark in school tests, so aim for full marks here to build confidence.
  • Q1. Who first discovered and named cells in 1665? (a) Schleiden (b) Schwann (c) Robert Hooke (d) Virchow
  • Q2. Prokaryotic cells are characterised by: (a) presence of nucleus (b) absence of cell wall (c) absence of membrane-bound nucleus (d) presence of mitochondria
  • Q3. The cell membrane is: (a) freely permeable (b) selectively permeable (c) impermeable (d) semi-solid
  • Q4. Which organelle is known as the 'powerhouse of the cell'? (a) Ribosome (b) Mitochondria (c) Golgi apparatus (d) Lysosome
  • Q5. Chloroplasts are found in: (a) animal cells only (b) prokaryotic cells (c) plant cells (d) all eukaryotic cells
  • Q6. The genetic material in prokaryotes is located in: (a) nucleus (b) nucleoid (c) mitochondria (d) ribosome
  • Q7. Lysosomes contain: (a) chlorophyll (b) digestive enzymes (c) ribosomes (d) starch
  • Q8. Which scientist stated that 'all cells arise from pre-existing cells'? (a) Robert Hooke (b) Schleiden (c) Schwann (d) Rudolf Virchow

Section B: Fill in the Blanks

Complete each sentence by filling in the blank with the correct technical term from the chapter. This section tests your precision with terminology—CBSE examiners award marks only if the exact word is used. Use NCERT language: for instance, write 'selectively permeable' not 'semi-permeable', and 'nucleoid' not 'nuclear region' for prokaryotes. Read each sentence twice to understand context before writing your answer. There are 6 fill-in-the-blank questions below. Each blank typically carries 1 mark in school worksheets, so ensure accuracy and correct spelling.
  • Q9. The outermost boundary of an animal cell is the __________, while in plant cells it is covered by a __________.
  • Q10. The jelly-like substance inside the cell where organelles are suspended is called __________.
  • Q11. The __________ is the control centre of the cell and contains chromosomes.
  • Q12. In plant cells, __________ is the organelle responsible for photosynthesis.
  • Q13. Ribosomes are the sites of __________ synthesis.
  • Q14. The Cell Theory was proposed by __________ and __________, and later modified by __________.

Section C: Match the Following and True/False

This section combines two question types. Part I is a matching exercise where you connect organelles or scientists with their correct descriptions or contributions. Write the correct pairs (e.g. A-3, B-1). Part II contains 4 True/False statements—write T or F, and for each False statement, write the corrected sentence in brackets. This dual format sharpens your ability to distinguish between similar concepts and identify factual errors, a skill tested in CBSE practicals and term papers. Each match or T/F usually carries 0.5 to 1 mark, so be precise.
  • Part I: Match the Following
  • Column A: (A) Mitochondria (B) Golgi apparatus (C) Lysosome (D) Chloroplast (E) Ribosome
  • Column B: (1) Packaging and dispatching of materials (2) Protein synthesis (3) Powerhouse of the cell (4) Digestion of waste (5) Photosynthesis
  • Part II: True or False
  • Q15. Prokaryotic cells have a well-defined nucleus. (T/F)
  • Q16. The cell wall in plants is made of cellulose. (T/F)
  • Q17. Lysosomes are found in both plant and animal cells. (T/F)
  • Q18. The nucleolus is involved in the formation of ribosomes. (T/F)

Section D: Short Answer Questions (2-3 marks each)

Answer each question in 30-50 words. CBSE examiners look for key points, correct terminology, and clarity. Use bullet points if it helps structure your answer. Do not write long essays—stick to the mark allocation. For a 2-mark question, two distinct points are enough; for 3 marks, give three points or two points with an example. Practice writing concise, complete answers that directly address the question. This section has 5 questions covering cell theory, differences between cell types, and organelle functions. Each question reflects common Class 9 board exam patterns, so treat this as exam practice.
  • Q19. State the three main points of the Cell Theory. (3 marks)
  • Q20. Differentiate between prokaryotic and eukaryotic cells (any two points). (2 marks)
  • Q21. What is the function of the plasma membrane? Why is it called selectively permeable? (2 marks)
  • Q22. Name the organelle that is the site of energy release in the cell. Describe its structure briefly. (3 marks)
  • Q23. Why do plant cells have a cell wall in addition to the cell membrane? (2 marks)

Section E: Long Answer and HOTS Questions (5 marks each)

These questions require detailed answers of 100-150 words each. They test your depth of understanding, ability to compare and contrast, and application of concepts to new situations. CBSE awards full marks only when you include diagrams (if asked), examples, and logical flow. Use subheadings or numbered points to organise your answer. Read the question carefully—keywords like 'explain', 'describe with diagram', or 'compare' guide your answer structure. There are 3 long-answer questions below. Allocate 8-10 minutes per question and aim for clarity over length. These mirror 5-mark questions in CBSE board exams.
  • Q24. Describe the structure and functions of the nucleus. Why is it called the control centre of the cell? (5 marks)
  • Q25. Draw a labelled diagram of a plant cell and an animal cell. List three differences between them. (5 marks)
  • Q26. (HOTS) A student observes two types of cells under a microscope. Cell X has no distinct nucleus and is very small. Cell Y is larger, has a nucleus, and contains mitochondria and chloroplasts. Identify the cell types, name one organism for each, and explain the structural basis for their size difference. (5 marks)

Case-Study Based Question

Case-studies test your ability to apply theoretical knowledge to real-life or experimental scenarios, a format increasingly common in CBSE papers since 2020. Read the passage carefully, underline key facts, then answer the sub-questions. Marks are distributed across recall, understanding, and application. This case-study is worth 4 marks total and has four sub-questions of 1 mark each. Do not skip any part; even if you are unsure, attempt an answer based on logic and chapter concepts. Use technical terms from NCERT wherever possible, as vague language loses marks.

Complete Answer Key with Explanations

Below is the full answer key for all sections. Each answer includes a brief explanation or reference to the relevant NCERT concept so you can learn from mistakes. Cross-check your responses carefully. For MCQs and fill-in-the-blanks, exact matches are required. For short and long answers, compare your key points with those given here—if you covered the same ideas in different words, award yourself marks. Use this answer key not just to score yourself, but to revise and reinforce concepts. If you scored below 70%, revisit the chapter, make notes on weak areas, and re-attempt the worksheet after two days. For any persistent doubts, consider using CBSETUTOR.ai where you can upload your worksheet answers as photos and get instant, personalised feedback from an AI tutor, available 24×7 at a flat monthly fee of ₹999 for all classes 6-12, with a 3-day free trial to start your learning journey.
  • Section A Answers: Q1–(c) Robert Hooke discovered cells in 1665 observing cork. Q2–(c) Prokaryotes lack a membrane-bound nucleus. Q3–(b) Selectively permeable means the membrane allows specific substances to pass. Q4–(b) Mitochondria produce ATP, hence 'powerhouse'. Q5–(c) Chloroplasts occur only in plant cells for photosynthesis. Q6–(b) Nucleoid is the region where DNA is located in prokaryotes. Q7–(b) Lysosomes have digestive enzymes to break down waste. Q8–(d) Rudolf Virchow stated all cells arise from pre-existing cells.
  • Section B Answers: Q9–cell membrane; cell wall. Q10–cytoplasm. Q11–nucleus. Q12–chloroplast. Q13–protein. Q14–Schleiden; Schwann; Virchow (or Rudolf Virchow).
  • Section C Answers: Match—A-3, B-1, C-4, D-5, E-2. True/False—Q15: False (Prokaryotes have no well-defined nucleus; DNA in nucleoid). Q16: True. Q17: False (Lysosomes are mainly in animal cells; plant cells have fewer or use vacuoles for similar functions). Q18: True (Nucleolus synthesises ribosomal RNA).
  • Section D Answers: Q19–(i) All living organisms are made of cells. (ii) The cell is the basic structural and functional unit of life. (iii) All cells arise from pre-existing cells. Q20–Prokaryotes: no nucleus, no membrane-bound organelles; Eukaryotes: true nucleus, organelles present. Q21–Plasma membrane separates cell interior from environment; selectively permeable because it allows certain molecules in/out while blocking others. Q22–Mitochondria; double membrane, inner folds (cristae), site of aerobic respiration producing ATP. Q23–Cell wall provides rigidity, shape, protection, prevents bursting due to osmotic pressure when water enters the cell.
  • Section E Answers: Q24–Nucleus has double membrane (nuclear envelope) with pores, contains chromosomes (DNA + proteins) and nucleolus. Functions: stores genetic info, directs protein synthesis via mRNA, controls cell division. Called control centre because it regulates all activities through DNA instructions. (Diagram: circle labelled nucleus, nuclear envelope, nucleolus, chromatin.) Q25–Diagram of plant cell: cell wall, cell membrane, large central vacuole, chloroplasts, nucleus, cytoplasm. Animal cell: cell membrane, small vacuoles, nucleus, cytoplasm. Differences: (i) Plant cells have cell wall, animal cells do not. (ii) Plant cells have chloroplasts, animal cells lack them. (iii) Plant cells have large central vacuole, animal cells have small scattered vacuoles. Q26–Cell X: prokaryotic (e.g. bacterium like E. coli). Cell Y: eukaryotic plant cell (e.g. leaf cell of a plant). Prokaryotes are small because they lack organelles and internal compartments, so diffusion meets metabolic needs. Eukaryotes are larger due to organelles and nucleus, allowing compartmentalisation and complex functions. Chloroplasts in Y confirm it is a plant cell.
  • Case-Study Answers: (i) Sample A: plant cell; Sample B: animal cell. (ii) Cell wall; made of cellulose. (iii) Plant cells store water, nutrients, waste in one large vacuole for turgor pressure; animal cells have small vacuoles for temporary storage. (iv) Chloroplast (present in plant cell for photosynthesis, absent in animal cell).

How CBSETUTOR.ai Helps You Master Chapter 5

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Tips to Maximise Your Worksheet Practice

Worksheets are only effective if used strategically. First, attempt the entire worksheet in one sitting under timed conditions (60-75 minutes) to simulate exam pressure. Do not refer to textbooks or notes while solving—this builds recall strength. After completing, immediately check the answer key and mark your score section-wise. Identify patterns: are you losing marks in MCQs due to careless reading, or in long answers due to incomplete explanations? Note down every mistake in a separate 'Error Log' notebook with the correct answer and the concept it tested. Review this log weekly. Second, after scoring, re-read the chapter sections corresponding to wrong answers. Make concise notes or flashcards for definitions, scientist names, and organelle functions. Third, for diagram-based questions (Q25), practice drawing labelled diagrams at least three times from memory—CBSE awards marks for neatness and correct labels. Finally, re-attempt the worksheet after one week without looking at your first attempt. Compare scores; improvement indicates effective revision. If scores remain static or drop, seek help from your teacher or use CBSETUTOR.ai to clarify persistent doubts. Consistency in worksheet practice, coupled with smart error analysis, is the formula for scoring 90+ in CBSE Class 9 Biology.
  • Attempt in timed conditions (60-75 min) without textbook to simulate exam pressure.
  • Check answers immediately; maintain an 'Error Log' notebook for all mistakes.
  • Revise NCERT sections corresponding to wrong answers within 24 hours.
  • Practice diagrams (plant/animal cell) 3 times from memory for accuracy and speed.
  • Re-attempt the worksheet after one week to measure retention and improvement.
  • Use CBSETUTOR.ai photo-upload feature for instant clarification on any confusing question.

Frequently asked questions

What is the ideal time to complete this CBSE Class 9 Biology Chapter 5 worksheet?+
Allocate 60-75 minutes for the entire worksheet. Section A (MCQs) should take 10 minutes, Section B (fill-blanks) 8 minutes, Section C (match/T-F) 10 minutes, Section D (short answers) 20 minutes, Section E (long answers) 25 minutes, and the case-study 7 minutes. Practice time management to mirror real exam conditions.
How many marks is this worksheet designed for?+
This worksheet totals approximately 40-45 marks if scored as per typical CBSE distribution: 8 MCQs (8 marks), 6 fill-blanks (6 marks), match and T/F (6 marks), 5 short answers (12 marks), 3 long answers (15 marks), 1 case-study (4 marks). Use it as a full chapter revision tool before periodic tests or term exams.
Are the questions in this worksheet similar to actual CBSE board exam questions?+
Yes, all questions are modelled on past CBSE Class 9 Biology papers and NCERT exercise patterns. MCQs test recall, short answers test explanation skills, long answers test depth and diagram ability, and the case-study mirrors the new competency-based format introduced in recent CBSE exams, ensuring thorough exam readiness.
Can I use this worksheet for group study or self-study?+
Both. For self-study, print and solve alone, then check answers. For group study, solve individually first, then discuss answers together, especially long questions and the case-study. Peer explanations often clarify doubts faster. Either way, avoid copying answers before attempting—active recall builds long-term memory.
What should I do if I score less than 50% on this worksheet?+
First, do not worry—worksheets reveal gaps, which is their purpose. Re-read NCERT Chapter 5 slowly, make short notes on each organelle and cell type, and watch a 10-minute YouTube summary if needed. Then re-attempt only the questions you got wrong. If confusion persists, upload your answers to CBSETUTOR.ai for instant, step-by-step AI explanations and personalised tips.
Is the answer key detailed enough to learn from my mistakes?+
Yes, every answer includes an explanation or reference to NCERT content. For instance, if you miss Q8, the key reminds you that Virchow added the principle of cell division to Cell Theory. Use the key not just to tick correct/wrong, but to understand why an answer is correct. This turns the worksheet into a learning tool, not just a test.
Do I need to draw diagrams for short-answer questions?+
Only if the question explicitly says 'draw' or 'with diagram' (like Q25). For other short answers, a well-labelled diagram can earn you an extra mark if it clarifies your explanation, but it is not compulsory. However, for 5-mark questions on nucleus or cell comparison, adding a neat, labelled diagram often secures full marks in CBSE exams.
Can I edit this worksheet to make it harder or easier for my level?+
Absolutely. If you find it too easy, add 2-3 more HOTS questions from NCERT exemplar or previous year papers. If too hard, start with Section A and B only, check answers, revise weak areas, then attempt Sections D and E the next day. Tailor practice to your comfort zone, gradually increasing difficulty as confidence builds.
How does this worksheet help with diagram-based questions in exams?+
Q25 specifically asks you to draw and label plant and animal cells, which is a common 5-mark board question. Practicing this now, checking label accuracy against NCERT Figures 5.3 and 5.4, and repeating the drawing thrice will ensure you can reproduce it neatly and quickly under exam pressure, securing full marks in diagram-based questions.
What is the best way to use CBSETUTOR.ai along with this worksheet?+
Solve the worksheet first on your own. Then, for any question you got wrong or felt unsure about, take a photo and upload it to CBSETUTOR.ai. The AI tutor will explain the correct answer, show you the NCERT reference, and even suggest how to frame your answer better. This immediate feedback loop speeds up learning and reduces dependency on waiting for teacher feedback, making revision efficient and stress-free.

Related resources

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