SEBA Class 9 Science Chapter 5 The Fundamental Unit of Life MCQs (2026–27) – Assam Eduverse
Strengthen your understanding of cell structure with SEBA Class 9 Science Chapter 5 The Fundamental Unit of Life MCQs (2026–27), prepared as per the latest ASSEB syllabus and current board exam pattern. These SEBA Class 9 Science Chapter 5 The Fundamental Unit of Life MCQs include important objective questions, diagram-based MCQs, and concept-driven practice sets to support effective exam preparation.
Developed by Assam Eduverse subject experts, these SEBA Class 9 Science Chapter 5 MCQs cover essential topics like cell theory, plant and animal cells, cell organelles, nucleus, mitochondria, plastids, endoplasmic reticulum, Golgi apparatus, lysosomes, and cell division. Practicing these The Fundamental Unit of Life MCQs Class 9 SEBA and Assam Board Class 9 Science objective questions helps improve conceptual clarity and accuracy. You can also explore more questions from Class 9 Science chapterwise MCQs and SEBA Class 9 MCQs.
Consistent practice of these ASSEB Class 9 Science Important MCQs will enhance your preparation and boost exam performance. For detailed explanations, visit SEBA Class 9 Science Chapter 5 The Fundamental Unit of Life Solutions, or explore additional resources like SEBA Class 9 & 10 study materials and SEBA Class 9 syllabus.
SEBA Class 9 Science Chapter 5 The Fundamental Unit of Life MCQs – ASSEB 2026–27 Board Exam Practice
Table of Contents
Before You Start
Test your knowledge with the SEBA Class 9 Science MCQs Quiz. Read each question carefully and select the correct answer. Your answer is checked instantly after you choose an option, and a detailed explanation appears immediately to help you learn every concept and improve your exam preparation.
Assertion (A): The plasma membrane is widely referred to as a selectively permeable membrane.
Reason (R): It acts as a gatekeeper that allows only certain specific substances to enter and exit the cell while blocking others.
✅ Correct Answer
Concept Explanation
The plasma membrane does not allow every molecule to wander through freely. Because it selectively permits the intake and exit of essential nutrients and wastes while blocking harmful materials, it is described as selectively permeable, making the reason a perfect explanation for the assertion.
Who discovered cells for the first time in history by looking at a sample under a primitive microscope?
✅ Correct Answer
Concept Explanation
In 1665, English scientist Robert Hooke examined a thin slice of dead bark tissue under his self-designed microscopic lens. He noticed a honeycomb pattern of tiny boxes that reminded him of small rooms, prompting him to name them cells.
The spontaneous movement of particles from a region of higher concentration to a region of lower concentration is known as:
✅ Correct Answer
Concept Explanation
Diffusion is a passive transport phenomenon where gas or liquid particles spread out naturally from areas where they are crowded to areas where they are less crowded until they distribute evenly. Osmosis is a specific type of diffusion that refers only to water movement.
Assertion (A): Lysosomes are frequently referred to as the "suicide bags" of a cell.
Reason (R): They contain highly powerful digestive enzymes capable of breaking down cellular components if the cell gets badly damaged or infected.
✅ Correct Answer
Concept Explanation
Lysosomes function as waste disposal units packed with strong hydrolytic enzymes. If a cell malfunctions or suffers severe structural damage, the lysosomes rupture, releasing these enzymes to digest the entire host cell from the inside out. This makes the reason statement a direct explanation for its dark nickname.
The first historic cells observed by science under a lens were found in a very thin slice of:
✅ Correct Answer
Concept Explanation
Robert Hooke used a thin slice of cork (derived from the bark of a Spanish oak tree) to make his discovery. Since cork consists of dead plant tissue, he was actually viewing the rigid empty cell walls left behind.
What is fundamentally classified as the basic structural and functional unit of all living organisms?
✅ Correct Answer
Concept Explanation
Every living organism on Earth is built out of one or more **cells**, and all biological activities required for survival happen inside these microscopic units. This makes the cell the building block of life.
Why is the cellular plasma membrane described as a selectively permeable barrier?
✅ Correct Answer
Concept Explanation
The plasma membrane controls the internal cellular environment. By allowing helpful molecules (like water, oxygen, and glucose) to pass through while keeping out harmful materials or preventing vital cytoplasm from escaping, it functions as a selectively permeable filter.
The specific passive movement of water molecules through a selectively permeable membrane is termed:
✅ Correct Answer
Concept Explanation
Osmosis is a special class of diffusion that describes the movement of water molecules. Water travels across a selectively permeable membrane from a high water concentration area (dilute solution) toward a low water concentration area (concentrated solution) until equilibrium is reached.
If the surrounding medium has a higher concentration of water molecules than the cell interior, the surrounding fluid is a:
✅ Correct Answer
Concept Explanation
A hypotonic solution is a dilute fluid containing a high concentration of water and very few dissolved solutes. When a cell sits in a hypotonic medium, water rushes inward across the membrane via osmosis, causing the cell to swell up.
The cellular shrinkage phenomenon known as plasmolysis happens when a living plant cell is placed in:
✅ Correct Answer
Concept Explanation
When a plant cell loses water through osmosis into a highly concentrated hypertonic solution, the living protoplasm contracts and pulls away from the rigid, outer structural cell wall. This specific shrinkage process is called **plasmolysis**.
The protective, external cell wall found in plant structures is composed primarily of:
✅ Correct Answer
Concept Explanation
Unlike animal cells, plant cells possess a tough cell wall outside their membrane. This wall is built out of **cellulose**, a complex structural carbohydrate that provides mechanical support, rigidity, and shape to the plant body.
The prominent central cell organelle known as the nucleus was discovered by:
✅ Correct Answer
Concept Explanation
In 1831, Scottish botanist Robert Brown identified and described the nucleus inside orchid plant cells, discovering the core control center that houses hereditary genetic data.
The small, functional segments mapped along hereditary DNA molecules are termed:
✅ Correct Answer
Concept Explanation
DNA stores the master blueprints for building proteins. The specific operational units or segments along a DNA strand that contain the code for individual traits are called **genes**.
Which of the following structural characteristics sets prokaryotic cells apart from eukaryotic cells?
✅ Correct Answer
Concept Explanation
Prokaryotes (like bacteria) are simple, primitive cells. Their genetic material floats freely in an open cytoplasmic zone called a nucleoid because they lack a protective, internal nuclear membrane, unlike more advanced eukaryotic cells.
Which internal microscopic organelle acts as the primary site for protein synthesis inside the cell?
✅ Correct Answer
Concept Explanation
Ribosomes are tiny, granular structures found floating in the cytoplasm or attached to the endoplasmic reticulum. They gather amino acids and assemble them into proteins based on instructions from the cell's genetic code.
Under an electron microscope, the Rough Endoplasmic Reticulum (RER) features a granular, rough texture due to the attachment of:
✅ Correct Answer
Concept Explanation
The Endoplasmic Reticulum is divided into two distinct regions. The rough variant (RER) has its outer surface studded with small, granular **ribosomes**, which manufacture proteins. Smooth endoplasmic reticulum (SER) lacks these particles and manufactures lipids instead.
The membrane-bound sacs of the Golgi apparatus perform which primary operational role within the cell?
✅ Correct Answer
Concept Explanation
The Golgi apparatus serves as the shipping department of the cell. It intercepts proteins and lipids synthesized by the endoplasmic reticulum, modifies them chemically, packages them neatly into vesicles, and dispatches them to their final destinations inside or outside the cell.
Which cellular organelle is universally nicknamed the "powerhouse of the cell" due to its role in energy production?
✅ Correct Answer
Concept Explanation
Mitochondria contain specialized respiratory enzymes folded along their inner membranes. They break down carbohydrates and lipids to generate cellular energy, earning them their classic powerhouse moniker.
The molecule known as Adenosine Triphosphate (ATP) is commonly referred to as the:
✅ Correct Answer
Concept Explanation
Just as human economies use money to carry out transactions, the cell uses **ATP** molecules to power metabolic work like active transport, chemical synthesis, and mechanical movement. This makes ATP the chemical energy currency of life.
Double-membraned plastid organelles are found exclusively inside:
✅ Correct Answer
Concept Explanation
Plastids (such as green chloroplasts or pigment-storing chromoplasts) are unique plant structures that animal cells completely lack. They are responsible for solar energy capture, manufacturing food, and pigment storage.
Which precise form of cellular division is responsible for tissue growth and bodily repair?
✅ Correct Answer
Concept Explanation
Mitosis is the standard division mechanism where a parent cell splits to form two identical daughter cells with the exact same chromosome count. Multicellular organisms rely on this pathway for growth, tissue repair, and everyday cell replacement. Meiosis is used exclusively for generating reproductive gametes.
Assertion (A): Mitochondria are widely designated as the functional powerhouses of the cell.
Reason (R): They conduct aerobic metabolic pathways to release usable chemical energy trapped inside ATP molecules.
✅ Correct Answer
Concept Explanation
Mitochondria function as cellular energy generators. Because they synthesize the ATP molecules that supply energy for all metabolic processes, the reason directly justifies why they are nicknamed the cell's powerhouses.
Assertion (A): Primitive prokaryotic cells contain a distinct, well-defined central nucleus.
Reason (R): Prokaryotic genetic material is safely bound and wrapped inside a nuclear membrane.
✅ Correct Answer
Concept Explanation
The assertion is false because prokaryotes do not possess a well-defined nucleus. Instead, their DNA floats openly in a cytoplasmic zone called a nucleoid. The reason statement itself is also false because prokaryotes lack an internal nuclear membrane wrapper completely.
Assertion (A): Green chromoplast organelles that contain chlorophyll pigments are called chloroplasts.
Reason (R): Chloroplasts trap solar energy to conduct photosynthesis, creating organic sugars for the plant.
✅ Correct Answer
Concept Explanation
Plastids containing colored pigments are known as chromoplasts. When these structures pack high amounts of the green pigment chlorophyll, they are specifically called chloroplasts. They serve as the sites for photosynthesis, which matches the explanation provided in the reason statement.
Which biological term describes the specialized movement of water molecules through a selectively permeable membrane when a plant cell loses water?
✅ Correct Answer
Concept Explanation
When a living plant cell loses internal moisture via outbound osmosis (exosmosis), its fluid content shrinks, causing the protoplasm to contract away from the outer cell wall. This specific process is defined as plasmolysis.
Assertion (A): The presence of a cell wall helps plant cells to withstand highly hypotonic surrounding solutions without bursting.
Reason (R): The cell wall exerts an equal counter-pressure against the swollen cell, preventing it from rupturing when excess water enters via osmosis.
✅ Correct Answer
Concept Explanation
When a plant cell takes up water by osmosis in a hypotonic environment, it swells up and builds turgor pressure against its outer boundary. Because the rigid cellulose cell wall is tough, it pushes back with an equal and opposite force. This mechanical support keeps the plant cell intact, allowing it to withstand extreme internal pressures that would cause an animal cell to burst.
Match the distinct cell division parameters in Column A with their appropriate biological functions in Column B:
| Column A | Column B |
|---|---|
| (a) Mitosis division | (1) Generates four unidentical daughter gametes |
| (b) Meiosis division | (2) Powers organismal growth and tissue repair |
| (c) Mother cell | (3) Represents the original cell prior to division |
| (d) Biological gametes | (4) Reproductive cells formed via meiotic pathways |
✅ Correct Answer
Concept Explanation
Mitosis is a vegetative process that generates duplicate daughter cells for growth and tissue replacement. Meiosis is a specialized reduction division that creates four distinct haploid reproductive gametes from a single parent cell. The starting cell before any division begins is referred to as the mother cell.
Assertion (A): Large vacuoles are a prominent and permanent structural feature of mature plant cells.
Reason (R): Vacuoles store cell sap to maintain internal turgidity and rigidity within the plant cell framework.
✅ Correct Answer
Concept Explanation
In many mature plant cells, the central vacuole is massive and can occupy up to 90% of the cell's total volume. Because it remains packed with fluid cell sap, it pushes out against the cytoplasm, maintaining the turgidity and mechanical strength required to hold plant structures upright.
Which of the following cellular structures are actively involved in the pathways of protein synthesis and distribution? - (i) Ribosomes
- (ii) Rough Endoplasmic Reticulum
- (iii) Smooth Endoplasmic Reticulum
- (iv) Mitochondria
✅ Correct Answer
Concept Explanation
Ribosomes are the molecular machines that link amino acids together to manufacture proteins. The Rough Endoplasmic Reticulum (RER) has its membranes studded with these ribosomes, allowing it to collect, fold, and process the newly built protein chains. The Smooth Endoplasmic Reticulum functions in lipid production, while mitochondria generate energy.
Which of the following cellular subsystems are features commonly found across advanced eukaryotic cells? - (i) A lipid-bound nuclear membrane
- (ii) Complex membrane-bound organelles
- (iii) An open, naked nucleoid chromosome region
- (iv) A well-defined, organized nucleus
✅ Correct Answer
Concept Explanation
Eukaryotic cells are defined by their internal organization. They house their genetic data inside a well-defined nucleus wrapped in a protective nuclear membrane, and they contain specialized membrane-bound organelles like mitochondria and Golgi bodies. An undefined nucleoid region (iii) is a characteristic feature unique to simpler prokaryotic cells.
Which of the following groups contain unicellular organisms that carry out all life functions within a single cell? - (i) Amoeba
- (ii) Chlamydomonas
- (iii) Paramecium
- (iv) Human beings
✅ Correct Answer
Concept Explanation
Amoeba, Chlamydomonas, and Paramecium are unicellular organisms whose entire bodies consist of a single independent cell capable of performing all essential life activities. Humans are complex multicellular organisms made up of billions of specialized cells coordinated into tissues and organs.
Assertion (A): Chromosomes can be clearly seen as well-defined, rod-like structures at all times during a cell's life cycle.
Reason (R): The diffuse, thread-like chromatin material condenses and coils into distinct chromosomes only when the cell is preparing to divide.
✅ Correct Answer
Concept Explanation
The assertion is false because chromosomes are not always visible as distinct rods. When a cell is conducting everyday metabolic activities and not dividing, its DNA exists as an uncoiled, mass of tangled threads called chromatin. The reason statement is true: this chromatin material condenses into neat, separate chromosomes only during cell division (mitosis or meiosis).
Which of the following processes involve the actual physical movement or transport of matter across the cell's plasma membrane? - (i) Molecular diffusion
- (ii) Solvent osmosis
- (iii) Active endocytosis
- (iv) Nuclear meiosis
✅ Correct Answer
Concept Explanation
Diffusion (passive transport of solutes), osmosis (passive flow of water), and endocytosis (active engulfing of external materials) are all processes that move substances across the plasma membrane. Meiosis is an internal nuclear division process concerned with generating gametes, not membrane transport.
Match the solutions in Column A with their immediate physiological effects on an open animal cell in Column B:
| Column A | Column B |
|---|---|
| (a) Hypotonic solution | (1) Net loss of water occurs, causing the cell to shrink |
| (b) Isotonic solution | (2) Dynamic equilibrium with no net movement of water |
| (c) Hypertonic solution | (3) Net intake of water occurs, causing the cell to swell |
| (d) Plasmolysis event | (4) Contraction of plant protoplasm away from its cell wall |
✅ Correct Answer
Concept Explanation
Hypotonic solutions are dilute, causing cells to absorb water and swell. Isotonic environments match the cell's concentration, resulting in zero net water movement. Hypertonic solutions draw water out, causing shrinkage. If a plant cell undergoes substantial water loss in a hypertonic environment, its plasma membrane collapses away from the cell wall, which is known as plasmolysis.
Which of the following internal organelle pairs are unique because they contain their own independent DNA loops and ribosomes? - (i) Mitochondria
- (ii) Plastids
- (iii) Lysosomes
- (iv) Ribosomes
✅ Correct Answer
Concept Explanation
Mitochondria and Plastids (like chloroplasts) are classified as semi-autonomous organelles. They contain their own loops of DNA and their own functional ribosomes, which allows them to synthesize some of their own proteins independently of the cell's nucleus. Lysosomes and individual ribosomes do not possess their own DNA.
Which of the following option choices accurately describe the functional and anatomical attributes of plant cell vacuoles? - (i) They function as storage units for amino acids, sugars, and proteins
- (ii) They actively help maintain cell turgidity by generating internal fluid pressure
- (iii) They are directly involved in generating large quantities of metabolic ATP
- (iv) They are bound sacs completely filled with fluid cell sap
✅ Correct Answer
Concept Explanation
Plant vacuoles are large, membrane-bound storage sacs filled with liquid cell sap that holds vital nutrients, pigments, and organic acids. They provide turgidity and structural support to plant tissue. ATP production (iii) is carried out by mitochondria, not vacuoles.
Assertion (A): The Smooth Endoplasmic Reticulum (SER) is a critical site for lipid and steroid synthesis within the cell.
Reason (R): The outer surface of the Smooth Endoplasmic Reticulum is densely studded with protein-building ribosomes.
✅ Correct Answer
Concept Explanation
The assertion is true: the Smooth Endoplasmic Reticulum (SER) is responsible for manufacturing fats, phospholipids, and steroid hormones. However, the reason statement is false because the SER is called "smooth" precisely because it lacks attached ribosomes. Ribosomes are found on the Rough Endoplasmic Reticulum (RER).
Match the genetic structures in Column A with their foundational definitions in Column B:
| Column A | Column B |
|---|---|
| (a) Chromatin | (1) The functional hereditary segment mapped along a DNA molecule |
| (b) Chromosome | (2) Complex macro-molecule that carries hereditary master blueprints |
| (c) DNA strand | (3) Untangled, thread-like mass of DNA seen in non-dividing cells |
| (d) Individual Gene | (4) Condensed, rod-like genetic package visible during division |
✅ Correct Answer
Concept Explanation
Chromatin is the relaxed, thread-like state of DNA found inside a cell during its normal operational phase. When a cell prepares to divide, this material condenses into tight, rod-like structures called chromosomes. DNA is the chemical compound that carries genetic code, and genes are the individual, functional units along a DNA strand.
Match the fundamental structures of an generalized cell in Column A with their descriptions in Column B:
| Column A | Column B |
|---|---|
| (a) Plasma membrane | (1) The internal fluid content that fills out the cell volume |
| (b) Cell wall | (2) A selectively permeable lipid envelope enclosing the cell |
| (c) Nucleus | (3) The main control center that coordinates cellular activities |
| (d) Cytoplasm | (4) A rigid, external layer providing mechanical support to plants |
✅ Correct Answer
Concept Explanation
The plasma membrane is a selectively permeable lipid bilayer common to all cells. The cell wall is a rigid external wrapper layer found in plants, fungi, and bacteria. The nucleus is the command center that houses DNA, and the cytoplasm is the gel-like fluid filling the inner cell space where organelles float.
Which of the following options outline legitimate physiological functions carried out by the Golgi apparatus? - (i) Intracellular storage of manufactured components
- (ii) Macromolecular packaging inside transport vesicles
- (iii) Chemical modification of complex substances
- (iv) Large-scale metabolic ATP production
✅ Correct Answer
Concept Explanation
The Golgi apparatus functions as a biochemical processing and packaging hub. It accepts proteins and lipids from the endoplasmic reticulum, modifies them chemically, packages them into membrane-bound vesicles, and stores or dispatches them. ATP generation (iv) is an energetic role performed exclusively by mitochondria.
Which of the following selections outline true structural characteristics of primitive prokaryotic cells? - (i) They completely lack an internal nuclear membrane wrapper
- (ii) They do not contain any membrane-bound organelles
- (iii) Their genetic material is packed into a single circular chromosome
- (iv) They maintain a large cell size typically ranging between 5 and 100 micrometres
✅ Correct Answer
Concept Explanation
Prokaryotes are small, simple single-celled systems that lack a nuclear membrane and complex membrane-bound organelles (like mitochondria). Their genetic material consists of a single circular DNA strand. Statement (iv) is incorrect because prokaryotes are exceptionally small, typically measuring only 1 to 10 micrometres in size; large dimensions of 5 to 100 micrometres are a hallmark feature of eukaryotic cells.
Assertion (A): Meiosis division pathways result in the production of four separate daughter cells.
Reason (R): During the multi-stage cycles of meiosis, the baseline chromosome number is reduced to exactly half.
✅ Correct Answer
Concept Explanation
Both statements are biologically accurate: a single parent cell undergoes two sequential nuclear divisions during meiosis to produce four daughter gametes, and the chromosome count is halved (reduction division). However, the halving of the chromosome count does not explain why four cells are formed (the four cells form because one replication cycle is followed by two rounds of division). Thus, the reason statement is not the correct explanation for the assertion.
Match the historical pioneers in Column A with their specific contribution to cell biology listed in Column B:
| Column A | Column B |
|---|---|
| (a) Robert Hooke | (1) Discovered the nucleus within plant cells |
| (b) Robert Brown | (2) Stated that all new cells arise from pre-existing cells |
| (c) Schleiden & Schwann | (3) Discovered and named cells using a cork slice |
| (d) Rudolf Virchow | (4) Formulated the foundational tenets of cell theory |
✅ Correct Answer
Concept Explanation
Robert Hooke discovered and named cells in 1665. Robert Brown discovered the nucleus in 1831. Schleiden and Schwann combined their work to propose the Cell Theory, stating that plants and animals are built of cells. Rudolf Virchow later expanded this theory by adding that all cells develop from pre-existing cells via division (*omnis cellula e cellula*).
Match the cellular organelle in Column A with its primary functional trait listed in Column B:
| Column A | Column B |
|---|---|
| (a) Mitochondrion | (1) Captures solar light to conduct photosynthesis |
| (b) Lysosome | (2) Serves as the powerhouse that manufactures ATP |
| (c) Chloroplast | (3) Suicide bag that houses destructive hydrolytic enzymes |
| (d) Vacuole organelle | (4) Storage sac that holds fluids, nutrients, or wastes |
✅ Correct Answer
Concept Explanation
Mitochondria generate metabolic energy in the form of ATP. Lysosomes contain powerful enzymes used to break down cellular wastes or old organelles. Chloroplasts are specialized green plastids that carry out photosynthesis in plants, and vacuoles function as massive storage sacs.
Match the plant organelle features in Column A with their property descriptions in Column B:
| Column A | Column B |
|---|---|
| (a) Chromoplast | (1) Contains green chlorophyll pigments for solar capture |
| (b) Leucoplast | (2) Colored plastid structure that stores non-green pigments |
| (c) Chlorophyll | (3) Nutrient solution stored inside the plant cell vacuole |
| (d) Cell sap | (4) Colorless plastid structure used to store starches and oils |
✅ Correct Answer
Concept Explanation
Chromoplasts are plastids that store bright pigments responsible for giving colors to flowers and fruits. Leucoplasts are unpigmented plastids that serve as storage depots for starches, oils, and proteins. Chlorophyll is the vital light-absorbing pigment found inside chloroplasts, and cell sap is the nutrient fluid that packs out plant vacuoles.
Which of the following groups represent legitimate functional classifications of plastid organelles found in plant cells? - (i) Chromoplasts
- (ii) Leucoplasts
- (iii) Chloroplasts
- (iv) Lysoplasts
✅ Correct Answer
Concept Explanation
Plastids are classified into distinct types based on their contents: chromoplasts contain non-green pigments, leucoplasts function as colorless storage compartments for starches and lipids, and chloroplasts are packed with green chlorophyll for photosynthesis. There is no such cellular organelle called a lysoplast (iv).
Match the biological transport mechanism in Column A with its definition listed in Column B:
| Column A | Column B |
|---|---|
| (a) Endocytosis | (1) Hepatic enzyme pathways that break down drugs or poisons |
| (b) Diffusion | (2) Intake of large external food masses by folding the membrane |
| (c) Osmosis | (3) Net passive transport of water across a selective filter |
| (d) Detoxification | (4) Passive dispersion of solute particles from high to low areas |
✅ Correct Answer
Concept Explanation
Endocytosis is an active process where flexible membranes fold inward to engulf large food particles (like an Amoeba eating). Diffusion describes the general passive spreading out of solute particles down a concentration gradient, while osmosis refers specifically to the passive movement of water. Detoxification is a chemical processing role carried out by the Smooth Endoplasmic Reticulum (SER) to neutralize toxins.
Match the structural regions of the Endoplasmic Reticulum in Column A with their correct functional descriptions in Column B:
| Column A | Column B |
|---|---|
| (a) Rough ER | (1) Serves as a major operational site for lipid synthesis |
| (b) Smooth ER | (2) Synthesizes protein strands using attached components |
| (c) Ribosomes | (3) Synthesized products are modified here and packed away |
| (d) Golgi apparatus | (4) Studded layer covered with many attached ribosomes |
✅ Correct Answer
Concept Explanation
The Rough Endoplasmic Reticulum (RER) is structurally defined by having its outer surface studded with ribosomes, which function as the sites of protein synthesis. The Smooth Endoplasmic Reticulum lacks these particles and manufactures lipid molecules instead. The Golgi apparatus works downstream to sort, modify, and package these materials into transport vesicles.
Match the structural nuclear descriptions in Column A with their correct cellular systems in Column B:
| Column A | Column B |
|---|---|
| (a) Prokaryotic cells | (1) Contain a well-defined nucleus wrapped in a membrane |
| (b) Eukaryotic cells | (2) Poorly defined nuclear zone lacking an outer boundary |
| (c) Nucleoid zone | (3) Organisms with primitive cells lacking a nuclear membrane |
| (d) Nuclear membrane | (4) A double-layered envelope surrounding the nucleus |
✅ Correct Answer
Concept Explanation
Prokaryotes are unicellular organisms that lack a distinct nuclear membrane wrapper, meaning their genetic material clusters inside a poorly defined open zone called a nucleoid. Eukaryotic cells represent more complex, advanced lineages that house their genetic blueprints inside an organized nucleus bound by a double-layered nuclear membrane envelope.
Which of the following listed structures and components represent fundamental parts found inside any typical biological cell? - (i) A outer plasma membrane envelope
- (ii) An internal fluid cytoplasm volume
- (iii) A core nuclear control center containing DNA
- (iv) An organized structural system of tissues
✅ Correct Answer
Concept Explanation
Every independent single cell contains three foundational architectural zones: an outer plasma membrane to enclose it, an internal liquid cytoplasm where metabolic tasks proceed, and a nucleus (or nucleoid area) containing genetic DNA instructions. A tissue (iv) is not a part of a cell; rather, a tissue is a macro-scale organization of many similar cells working together to perform a collective function.
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SEBA Class 9 Science Chapter 5 The Fundamental Unit of Life MCQs – Important Objective Questions
A clear understanding of The Fundamental Unit of Life is essential for building a strong base in Biology. Regular practice of well-structured MCQs based on the latest SEBA (ASSEB) syllabus helps students strengthen their concepts and become familiar with the types of objective questions asked in examinations.
These SEBA Class 9 Science Chapter 5 MCQs focus on important topics such as cell structure, differences between plant and animal cells, and the functions of key cell organelles like nucleus, mitochondria, plastids, vacuoles, endoplasmic reticulum, Golgi apparatus, and lysosomes. Understanding these concepts is crucial, as they form the foundation for many advanced topics in Biology.
By solving these important objective questions for Class 9 Science, students can improve their ability to identify diagrams, understand organelle functions, and avoid confusion between similar concepts. It also helps in strengthening memory and applying concepts correctly in different types of questions.
Consistent practice of MCQs enhances accuracy, speed, and confidence. Students become more comfortable with exam patterns, manage time effectively, and can revise the entire chapter in a structured and efficient way before exams.
To perform well in school assessments and board-level examinations, students should make these MCQs a regular part of their study routine. With strong conceptual understanding and continuous revision, scoring high in this chapter becomes much easier and more achievable.
FAQs – SEBA Class 9 Science Chapter 5 The Fundamental Unit of Life MCQs
1. How many MCQs come from The Fundamental Unit of Life in SEBA Class 9 exam?
Usually 4–6 MCQs come from this chapter. Since 45 MCQs are asked overall, focus on cell structure, organelles, and functions for scoring marks.
2. What are the most important MCQs from Chapter 5 The Fundamental Unit of Life?
Important MCQs focus on nucleus, mitochondria, cell membrane, and diffusion. Practice repeated questions from Assam Eduverse to understand exam patterns easily.
3. Is The Fundamental Unit of Life chapter difficult for Class 9 SEBA students?
No, it’s easy if concepts are clear. Diagrams and functions of organelles are key—revise them daily to avoid confusion during MCQs.
4. Where can I download SEBA Class 9 Science Chapter 5 MCQs with answers PDF?
You can download chapter-wise MCQs PDFs from Assam Eduverse and similar sites. Always practice solved papers to improve speed and accuracy.
5. Are there any numericals in The Fundamental Unit of Life chapter for SEBA exam?
No major numericals are asked here. Focus more on concept-based MCQs like osmosis, diffusion, and cell structure differences.
6. How to prepare Chapter 5 MCQs quickly before exam?
Revise definitions, diagrams, and previous MCQs. Practice 20–30 questions daily and focus on weak areas like cell organelle functions.
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