Are these practice questions for Cell: The Building Block of Life based on the CBSE pattern?

Yes. Every practice question is modeled on the CBSE Class 9 Science exam pattern — including MCQs, assertion-reason questions, and short-answer formats that frequently appear in CBSE papers.

Are the practice questions for Cell: The Building Block of Life free?

Yes. Every chapter includes free practice questions for Class 9 students to get you started.

What types of questions are included?

The practice set for Cell: The Building Block of Life mainly includes MCQs and CBSE-style short-answer questions, with instant feedback on each answer. For full-length textbook practice, use the NCERT Solutions page.

Are the practice questions suitable for board exam preparation?

Yes. The questions test the same concepts and depth that CBSE asks in board exams. After finishing, also solve the NCERT and NCERT Exemplar exercises for Cell: The Building Block of Life for full coverage.

How many practice questions are there for Cell: The Building Block of Life?

The number scales with chapter length and concept density. Each chapter typically has 15-50 practice questions across MCQ and short-answer formats.

Cell: The Building Block of Life Class 9 Science Practice Questions with Answers

easy

Justify why the inner membrane of a mitochondrion is highly folded into cristae.

Try solving it in your notebook first, then check the solution.

easy

Name the organelle responsible for generating most of the cell's supply of adenosine triphosphate (ATP).

Try solving it in your notebook first, then check the solution.

easy

Justify the presence of numerous ribosomes in cells that specialize in secreting proteins, such as pancreatic cells.

Try solving it in your notebook first, then check the solution.

easy

Define the term 'cell' as the basic unit of life.

Try solving it in your notebook first, then check the solution.

easy

Name the tiny organelles, found freely in the cytoplasm or attached to the endoplasmic reticulum, that are responsible for protein synthesis.

Try solving it in your notebook first, then check the solution.

easy

Apply your understanding of cell division to explain how a minor cut on your skin heals over a few days.

Try solving it in your notebook first, then check the solution.

easy

Calculate the total magnification of a light microscope if the eyepiece has a power of

15\text{X}

and the objective lens being used has a power of

40\text{X}

.

Try solving it in your notebook first, then check the solution.

easy

Analyze the immediate consequence for a mature plant cell if its large central vacuole were to rupture and release its contents into the cytoplasm.

Try solving it in your notebook first, then check the solution.

medium

List three key structural differences between a typical plant cell and a typical animal cell.

Try solving it in your notebook first, then check the solution.

medium

Describe the structural difference between Rough Endoplasmic Reticulum (RER) and Smooth Endoplasmic Reticulum (SER) and state one primary function for each.

Try solving it in your notebook first, then check the solution.

medium

Identify the main structural carbohydrate that makes up the cell wall in plants.

Try solving it in your notebook first, then check the solution.

medium

Evaluate the statement: "The Endoplasmic Reticulum, Golgi apparatus, and lysosomes work as a coordinated system for protein processing and cellular maintenance." Justify your evaluation by describing the specific roles of each organelle and how their functions are interconnected.

Try solving it in your notebook first, then check the solution.

medium

A student observes an onion peel under a microscope. The diameter of the field of view is measured to be

4 \text{ mm}

. If the student counts approximately 20 cells arranged in a line across the diameter, calculate the estimated size of a single onion cell in micrometres ($\mu\text{m}).

Try solving it in your notebook first, then check the solution.

medium

Summarize what happens to a plant cell when it is placed in a hypertonic (concentrated salt) solution. Explain the role of the cell wall in this process.

Try solving it in your notebook first, then check the solution.

medium

Compare and contrast the outermost boundary of a typical plant cell and an animal cell. Analyze how this structural difference affects their response when placed in pure water.

Try solving it in your notebook first, then check the solution.

medium

Create a simplified model of a cell membrane using common household items. List the items you would use, what each item represents, and justify why your model accurately represents the 'fluid' and 'mosaic' nature of the membrane.

Try solving it in your notebook first, then check the solution.

medium

Based on the main principles of the Cell Theory, analyze why viruses are generally not considered living organisms.

Try solving it in your notebook first, then check the solution.

medium

Mature human red blood cells are enucleated (lack a nucleus). Analyze how this structural adaptation is both an advantage for its primary function and a disadvantage for its longevity.

Try solving it in your notebook first, then check the solution.

medium

Compare the primary functions of mitochondria and chloroplasts in a plant cell. How are they both similar in their role as energy converters?

Try solving it in your notebook first, then check the solution.

medium

Define the process of mitosis.

Try solving it in your notebook first, then check the solution.

medium

Analyze the potential consequences for a cell if its lysosomes fail to function correctly. Provide two specific examples of problems that would arise.

Try solving it in your notebook first, then check the solution.

medium

Propose one major consequence for a plant if its cell walls were suddenly made flexible and selectively permeable like a cell membrane.

Try solving it in your notebook first, then check the solution.

medium

Formulate an argument to support the endosymbiotic theory, based on the unique characteristics of mitochondria and chloroplasts within a eukaryotic cell.

Try solving it in your notebook first, then check the solution.

medium

Contrast a bacterial cell (prokaryote) with an animal cell (eukaryote) based on the organization of their genetic material and the presence of subcellular compartments.

Try solving it in your notebook first, then check the solution.

medium

A student claims that since plant roots are non-photosynthetic, they do not contain any plastids. Evaluate this claim. Justify your conclusion with examples.

Try solving it in your notebook first, then check the solution.

medium

A freshwater amoeba is placed in a marine (saltwater) environment. Analyze the immediate effect on the amoeba's cell due to osmosis and explain the underlying process.

Try solving it in your notebook first, then check the solution.

medium

Design an experiment to demonstrate that the cell membrane of a plant cell (e.g., Rhoeo leaf) is selectively permeable, while its cell wall is fully permeable. Propose the expected observations and justify your reasoning.

Try solving it in your notebook first, then check the solution.

medium

List the three main postulates of the classical Cell Theory.

Try solving it in your notebook first, then check the solution.

medium

Describe the primary function of the cell membrane and explain the meaning of it being 'selectively permeable'.

Try solving it in your notebook first, then check the solution.

medium

Design a hypothetical experiment using cell culture to test the concept of 'contact inhibition' in normal cells versus cancer cells. Propose the expected results for both cell types.

Try solving it in your notebook first, then check the solution.

medium

Describe the structure and function of the nucleus in a eukaryotic cell. Include the roles of the nuclear envelope, chromatin, and nucleolus in your description.

Try solving it in your notebook first, then check the solution.

medium

Explain why mitochondria are called the 'powerhouses of the cell' and name the energy currency molecule they produce.

Try solving it in your notebook first, then check the solution.

medium

Analyze the functional relationship between the Rough Endoplasmic Reticulum (RER) and the Golgi apparatus in a cell that secretes digestive enzymes, such as a pancreatic cell.

Try solving it in your notebook first, then check the solution.

medium

Critique the classical Cell Theory by identifying a biological entity that does not fully conform to its three principles. Justify why this entity challenges the theory.

Try solving it in your notebook first, then check the solution.

medium

Explain two key differences between prokaryotic and eukaryotic cells.

Try solving it in your notebook first, then check the solution.

hard

Propose a hypothesis for what would happen to an organism if the process of meiosis produced diploid gametes instead of haploid gametes. Justify the potential consequences for the offspring.

Try solving it in your notebook first, then check the solution.

hard

Explain the functions of the three main types of plastids found in plant cells.

Try solving it in your notebook first, then check the solution.

hard

Examine the behavior of a Rhoeo leaf cell placed in a concentrated sugar solution. Contrast this with what would happen to a human cheek cell under the same conditions, focusing on the role of the cell wall.

Try solving it in your notebook first, then check the solution.

hard

Justify why prokaryotic cells can be metabolically diverse despite their simple structure.

Try solving it in your notebook first, then check the solution.

hard

Evaluate the biological significance of mitosis and meiosis in a multicellular organism like a human. Justify why both processes are essential for the life cycle, contrasting their outcomes.

Try solving it in your notebook first, then check the solution.

hard

A student observes an onion peel under a microscope with a 10X eyepiece and a 40X objective lens. The diameter of the field of view is measured to be

0.45 \text{ mm}

. She counts approximately 9 cells across the diameter. Formulate a method to calculate the estimated size of a single onion cell in micrometres (

\mu m

) and evaluate the total magnification used.

Try solving it in your notebook first, then check the solution.

hard

Compare mitosis and meiosis by examining four key differences, including the type of cells involved, the number of daughter cells produced, the chromosome number in daughter cells, and the primary biological purpose of each process.

Try solving it in your notebook first, then check the solution.

hard

The principle of osmosis is used in preserving foods like pickles and jams. Create a flowchart to explain how adding a high concentration of salt (for pickles) or sugar (for jams) prevents the growth of spoilage-causing microbes. Justify each step based on water movement.

Try solving it in your notebook first, then check the solution.

hard

Examine the fluid-mosaic model of the plasma membrane. Explain how the 'fluid' and 'mosaic' aspects of this model contribute to the membrane's primary function of selective permeability.

Try solving it in your notebook first, then check the solution.

hard

A student is using a microscope with a field of view diameter of

4000 \text{ } \mu m

. If they count approximately 20 onion cells lined up across the diameter, what is the estimated size of a single onion cell?

Try solving it in your notebook first, then check the solution.

Cell: The Building Block of LifeClass 9 Science Practice Questions