Enquire Now

News Feed

Earth as a System: Energy, Matter,

29 October 2026

Class 9 Science Chapter 1 Notes

29 October 2026

Class 9 Science Cell Worksheet with

28 October 2026

exploration-entering-the-world-of-secondary-science-worksheet

26 October 2026

Class 9 Science Cell Worksheet with Answers | NCERT-Based Questions

9 Views0 Comment

Class 9 Science Worksheet

Chapter 2: Cell — The Building Block of Life

NCERT-Based Practice | Conceptual Questions | Exam Preparation

Read the chapter notes before attempting this worksheet.

Revise cell structures, cell organelles, osmosis, cell theory and cell division here:

Class 9 Science — Cell: The Building Block of Life Notes →
SubjectScience — Biology
Suggested time60 minutes
Maximum marks40 marks
General Instructions
  • Attempt all sections unless an internal choice is given.
  • Read each question carefully before writing your answer.
  • Use correct scientific terms and give reasons wherever asked.
  • Draw neat, labelled diagrams where required.
  • Answers and hints are provided at the end. Try the questions independently before checking them.

Section A — Multiple-Choice Questions (8 × 1 = 8 marks)

1. Who first observed cells in a thin slice of cork in 1665?
  1. Rudolf Virchow
  2. Robert Hooke
  3. Theodor Schwann
  4. Matthias Schleiden
2. Which structure controls the movement of substances into and out of a cell?
  1. Cell wall
  2. Nucleolus
  3. Cell membrane
  4. Ribosome
3. The genetic material of a typical prokaryotic cell is found in the:
  1. Nucleoid region
  2. Golgi apparatus
  3. Vacuole
  4. Mitochondrion
4. Which organelle is mainly associated with ATP production during aerobic cellular respiration?
  1. Lysosome
  2. Golgi apparatus
  3. Vacuole
  4. Mitochondrion
5. Which organelle contains chlorophyll and carries out photosynthesis?
  1. Chloroplast
  2. Ribosome
  3. Lysosome
  4. Nucleus
6. A plant cell placed in a concentrated salt solution loses water and its cell membrane pulls away from the cell wall. This is called:
  1. Diffusion
  2. Plasmolysis
  3. Photosynthesis
  4. Cell division
7. Which organelle modifies, sorts and packages proteins and lipids?
  1. Ribosome
  2. Nucleolus
  3. Golgi apparatus
  4. Cell wall
8. Which statement about meiosis is correct?
  1. It always produces two identical diploid cells.
  2. It involves no change in chromosome number.
  3. It occurs only for growth and repair.
  4. It involves two successive divisions and reduces the chromosome number by half.

Section B — Assertion and Reason (3 × 1 = 3 marks)

For Questions 9–11, select the correct option:

  • A. Both Assertion and Reason are true, and Reason correctly explains Assertion.
  • B. Both Assertion and Reason are true, but Reason does not correctly explain Assertion.
  • C. Assertion is true, but Reason is false.
  • D. Assertion is false, but Reason is true.
9. Assertion: Plant cells usually have a large central vacuole.
Reason: The vacuole stores cell sap and helps maintain the firmness of the cell.
10. Assertion: Ribosomes are the sites of protein synthesis.
Reason: Ribosomes are present only inside the nucleus.
11. Assertion: Meiosis contributes to genetic variation.
Reason: Meiosis can produce genetically different haploid cells.

Section C — Very Short Answer Questions (5 × 2 = 10 marks)

12. Define a cell. Why is it called the basic structural and functional unit of life?
13. Write two differences between prokaryotic and eukaryotic cells.
See also  Class 9 – Natural Vegetation and Wildlife | SST Practice Paper
14. What is osmosis? State the direction in which water moves during osmosis.
15. Name any two cell organelles that contain their own DNA. What is one feature they have in common?
16. Differentiate between rough endoplasmic reticulum and smooth endoplasmic reticulum.

Section D — Short Answer Questions (3 × 3 = 9 marks)

17. Explain what happens to a plant cell when it is placed in:
  1. Plain water.
  2. A concentrated salt solution.
  3. An isotonic solution.
18. Explain the functions of the following organelles:
  1. Golgi apparatus.
  2. Lysosomes.
  3. Mitochondria.
19. State the three main statements of classical cell theory. Name the scientists associated with its development.

Section E — Long Answer Questions (2 × 3 = 6 marks)

20. Compare mitosis and meiosis on the basis of:
  1. Number of successive divisions.
  2. Number of daughter cells usually produced.
  3. Chromosome number in the daughter cells compared with the parent cell.
21. Describe the structure and functions of the nucleus. Include the nuclear envelope, nuclear pores, nucleolus and chromosomes in your answer.

Section F — Competency-Based Questions (2 × 2 = 4 marks)

Case Study 1: The Potato Experiment

A student places two similar potato pieces in separate beakers. Beaker A contains plain water, while Beaker B contains a concentrated salt solution. After some time, the potato piece in Beaker A becomes firmer, whereas the piece in Beaker B becomes softer and smaller.

22.
  1. Which process explains the movement of water in this experiment? (1 mark)
  2. Why does the potato piece in Beaker B shrink? (1 mark)
Case Study 2: Preserving Food

A family prepares a fruit preserve by adding a large quantity of sugar. The high concentration of sugar creates an environment in which many spoilage-causing microorganisms struggle to survive and multiply.

23.
  1. Which process involving water movement helps explain this effect? (1 mark)
  2. How does the concentrated sugar solution affect water movement in microbial cells? (1 mark)

Section G — Diagram-Based Practice

24. Draw a neat, labelled diagram of a plant cell. Label any six structures and write the function of any two.
25. Draw a labelled mitochondrion and identify the outer membrane, inner membrane, cristae and matrix.
26. Draw a simple flow diagram showing how one diploid parent cell can produce four haploid cells through meiosis. Indicate where the chromosome number is reduced.

Prepare Better Before Your Exams

Practise more Class 9 sample papers and revision papers to strengthen your concepts and improve exam readiness.

Attempt More Class 9 Practice Papers →

Answers and Hints

Complete the worksheet first. Open the answer key only when you are ready to check your work. For descriptive answers, use the hints to frame a complete response in your own words.

View Answers and Hints

Section A — Multiple-Choice Questions

1. B — Robert Hooke. He observed cork under a microscope in 1665 and used the term “cells”.
2. C — Cell membrane. It is selectively permeable and regulates the movement of substances.
3. A — Nucleoid region. Prokaryotes do not have a membrane-bound nucleus.
4. D — Mitochondrion. It is a major site of ATP production during aerobic cellular respiration.
5. A — Chloroplast. Chlorophyll in chloroplasts absorbs light energy for photosynthesis.
6. B — Plasmolysis. Water loss causes the cell contents to shrink away from the cell wall.
7. C — Golgi apparatus. It modifies, sorts and packages proteins and lipids.
8. D. Meiosis involves two successive divisions and reduces the chromosome number by half.

Section B — Assertion and Reason

9. A. Both statements are true, and the reason explains the importance of the large central vacuole.
10. C. The assertion is true, but the reason is false. Ribosomes may be free in the cytoplasm or attached to rough ER; they are not present only inside the nucleus.
11. A. Meiosis produces haploid cells that can differ genetically, contributing to variation.

Section C — Very Short Answers

12. A cell is the basic unit of life. It forms the structure of organisms and carries out essential life processes such as nutrition, respiration, waste removal and reproduction.
13. Any two differences:
See also  Class 9 Tissues Worksheet | NCERT Biology Practice Paper
  • Prokaryotes lack a well-defined, membrane-bound nucleus; eukaryotes have one.
  • Prokaryotes lack membrane-bound organelles; eukaryotes contain organelles such as mitochondria and the Golgi apparatus.
14. Osmosis is the movement of water through a selectively permeable membrane from higher water concentration to lower water concentration.
15. Mitochondria and chloroplasts. Both have their own DNA and ribosomes and can make some of their own proteins.
16. Rough ER has ribosomes attached and is involved in protein synthesis and processing. Smooth ER lacks attached ribosomes and helps in lipid synthesis.

Section D — Short Answers

17.
  • Plain water: Water enters the cell by osmosis; the vacuole expands and the cell becomes turgid.
  • Concentrated salt solution: Water leaves the cell; the contents shrink and plasmolysis may occur.
  • Isotonic solution: Water moves in both directions at approximately the same rate, so there is no net movement of water.
18.
  • Golgi apparatus: Modifies, sorts and packages proteins and lipids for transport or secretion.
  • Lysosomes: Contain enzymes that break down unwanted materials and damaged cell components.
  • Mitochondria: Carry out important stages of cellular respiration and produce ATP.
19. Classical cell theory states:
  1. All living organisms consist of one or more cells.
  2. The cell is the basic unit of structure and function in living organisms.
  3. All cells arise from pre-existing cells.
Schleiden studied plant cells, Schwann established that animals are also made of cells, and Virchow stated that new cells arise from pre-existing cells.

Section E — Long Answers

20. Mitosis and meiosis:
FeatureMitosisMeiosis
DivisionsOneTwo successive divisions
Daughter cellsUsually twoUsually four
Chromosome numberUsually the same as the parent cellHalf that of the diploid parent cell
See also  The Rise of Hitler and Nazism Questions with Answers - Class 9 Worksheet
Mitosis supports growth, repair and cell replacement. Meiosis produces haploid cells for sexual reproduction and contributes to genetic variation.
21. Nucleus:
  • Nuclear envelope: Surrounds the nucleus and separates it from the cytoplasm.
  • Nuclear pores: Regulate the movement of selected substances between the nucleus and cytoplasm.
  • Nucleolus: Involved in the formation of ribosomal components.
  • Chromosomes: Contain DNA and associated proteins; genes are segments of DNA that carry genetic information.
The nucleus contains most of the cell's genetic material and helps regulate cellular activities.

Section F — Competency-Based Questions

22.
  1. Osmosis. Water moves across selectively permeable cell membranes.
  2. The concentrated salt solution has a lower water concentration than the cell contents, so water moves out of the potato cells. The cells lose turgidity and the piece may shrink.
23.
  1. Osmosis.
  2. The concentrated sugar solution draws water out of many microbial cells through their membranes. Water loss interferes with their normal activities and can limit their growth. The effect depends on the microorganism and storage conditions.

Section G — Diagram-Based Practice

24. Plant cell: Your diagram may include the cell wall, cell membrane, cytoplasm, nucleus, large central vacuole, chloroplasts, mitochondria, Golgi apparatus and ribosomes. Possible functions: the nucleus contains genetic material; chloroplasts carry out photosynthesis; the cell wall provides support; the vacuole stores cell sap and helps maintain firmness.
25. Mitochondrion: Label the smooth outer membrane, folded inner membrane, cristae and matrix. The folds of the inner membrane increase the surface area available for reactions involved in ATP production.
26. Meiosis: Draw one diploid parent cell (2n), followed by the first division producing two cells and the second division producing four haploid cells (n). The chromosome number is reduced during meiosis I, when homologous chromosomes separate.
Self-check tip: For full marks, include the correct scientific term, explain the process clearly and add a labelled diagram wherever the question asks for one. Acceptable wording may vary as long as the scientific meaning is correct.

For a clean printout, expand the answer key first if you want to print the solutions as well.

Leave A Comment

Your email address will not be published. Required fields are marked *

error: Content is protected !!