Cell
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Differentiate plant, animal, prokaryotic, and eukaryotic cells and explain their structural roles
SubtopicDifferentiate plant, animal, prokaryotic, and eukaryotic cells and explain their structural roles under Cell for Grade 9 CBSE.
Preview questions (no answers)
- 1.
Cells which can change their shape like Amoeba are also found in the human body. Name them.
A.Nerve cells
B.Red blood cells
C.White blood cells
D.Muscle cells
- 2.
Which part of the microscope is used to get a sharp focus of the image?
A.Fine adjustment knob
B.Coarse adjustment knob
C.Stage clips
D.Mirror
- 3.
The size of a cell is mostly limited by:
A.The size of the organism
B.The amount of food available
C.Surface area to volume ratio
D.The number of nuclei
- 4.
In 1839, which of the following pairs of scientists together established the 'Cell Theory'?
A.Hooke and Brown
B.Schleiden and Schwann
C.Watson and Crick
D.Leeuwenhoek and Purkinje
- 5.
The cell theory unified which two branches of biology in the 19th century?
A.Botany and Zoology
B.Physics and Chemistry
C.Genetics and Ecology
D.Microbiology and Astronomy
- 6.
If we say 'a tissue is a group of similar cells', which part of the cell theory are we emphasizing?
A.The cell as a structural unit.
B.The cell as a reproductive unit.
C.The cell as an evolutionary unit.
D.The cell as a dead unit.
- 7.
Which of these is a characteristic of all living cells, as per the cell theory?
A.They must have a cell wall.
B.They must have the ability to perform basic life functions.
C.They must be large enough to see with the naked eye.
D.They must be part of a multicellular organism.
- 8.
If you were to observe a cell undergoing 'cytokinesis', which specific tenet of the Cell Theory are you witnessing in action?
A.All organisms are made of cells.
B.The cell is the basic structural unit.
C.All cells arise from pre-existing cells.
D.Cells contain hereditary information.
- 9.
How does the 'Surface Area to Volume ratio' relate to the cell being the 'Unit of Function'?
A.Larger cells function better because they store more food.
B.Smaller cells have a higher ratio, allowing faster exchange of materials to maintain metabolism.
C.The ratio doesn't matter as long as the cell has a wall.
D.A low ratio is preferred for high metabolic activity.
- 10.
Which level of resolution is typically required to validate the 'Modern' additions to Cell Theory, such as the internal structure of a ribosome?
A.(Human Eye)
B.(Light Microscope)
C.(Electron Microscope)
D.(Magnifying Glass)
Download the worksheet for Cell - Differentiate plant, animal, prokaryotic, and eukaryotic cells and explain their structural roles to practice offline. It includes additional chapter-level practice questions.
Describe functions of nucleus, mitochondria, chloroplast, ER, vacuoles, plasma membrane, and cell wall
SubtopicDescribe functions of nucleus, mitochondria, chloroplast, ER, vacuoles, plasma membrane, and cell wall under Cell for Grade 9 CBSE.
Preview questions (no answers)
- 1.
In plants, the cell wall is primarily made of:
A.Proteins
B.Lipids
C.Cellulose
D.Chitin
- 2.
Which of these would happen if a cell's plasma membrane ruptures?
A.The cell will grow faster
B.The cell will be able to transport more food
C.The cell will die as it cannot maintain its internal environment
D.The cell wall will take over its function
- 3.
The cell wall is ______ to most substances.
A.Selectively permeable
B.Semi-permeable
C.Freely permeable
D.Impermeable
- 4.
Which process is responsible for the movement of from the air into the cell?
A.Diffusion
B.Osmosis
C.Plasmolysis
D.Exocytosis
- 5.
What prevents the cell wall from being selectively permeable?
A.Its lipid composition
B.Its big porous structure made of cellulose
C.The presence of proteins
D.The absence of water
- 6.
A cell is described as 'flaccid' when:
A.It is placed in distilled water
B.It is in a hypotonic solution and swollen
C.It is in an isotonic solution and not turgid
D.It is completely dried out
- 7.
The movement of and across the cell membrane is a type of:
A.Active transport
B.Passive transport
C.Bulk transport
D.Osmotic transport
- 8.
In the absence of a plasma membrane, which function would be impossible for the cell?
A.Providing mechanical strength through a rigid wall
B.Maintaining a distinct internal chemical environment relative to the outside
C.Synthesizing proteins on ribosomes
D.Storing genetic information in DNA
- 9.
The cell wall of diatoms is unique because it is heavily impregnated with:
A.Silica
B.Calcium carbonate
C.Lignin
D.Chitin
- 10.
Which type of molecular transport requires the use of energy (ATP)?
A.Movement of oxygen into the cell
B.Movement of water from high to low concentration
C.Movement of glucose into a cell where the glucose concentration is already very high
D.Movement of carbon dioxide out of the cell
Download the worksheet for Cell - Describe functions of nucleus, mitochondria, chloroplast, ER, vacuoles, plasma membrane, and cell wall to practice offline. It includes additional chapter-level practice questions.
Demonstrate and explain osmosis, diffusion, and membrane permeability in cells
SubtopicDemonstrate and explain osmosis, diffusion, and membrane permeability in cells under Cell for Grade 9 CBSE.
Preview questions (no answers)
- 1.
Which process explains the spread of copper sulphate color in a beaker of water?
A.Osmosis
B.Endosmosis
C.Diffusion
D.Exosmosis
- 2.
In which solution will the cell size remain the same?
A.Hypotonic
B.Hypertonic
C.Isotonic
D.Very acidic
- 3.
When a cell is placed in an isotonic solution, the net movement of water is:
A.Into the cell
B.Out of the cell
C.Zero
D.Depends on the size
- 4.
Which component of the cell allows it to take in food by changing its shape?
A.Rigid cell wall
B.Flexible plasma membrane
C.Hard nucleus
D.Fixed vacuoles
- 5.
Two different types of animal cells, Cell A and Cell B, are placed in the same container of salt solution. After ten minutes, Cell A is observed to have swollen significantly, while Cell B shows no change in its volume. What can be inferred about the initial internal water concentration of these cells relative to each other?
A.Cell A had a higher concentration of water than Cell B initially.
B.Cell A had a lower concentration of water than Cell B initially.
C.Both cells had an equal concentration of water and solutes initially.
D.Cell B is more permeable to salt than Cell A, preventing it from swelling.
- 6.
A dialysis bag containing a mixture of starch and glucose is placed in a beaker of pure water. After some time, a student tests the water in the beaker and finds that glucose is present, but starch is not. What does this observation reveal about the membrane of the bag?
A.The membrane is freely permeable to all types of solute molecules regardless of size.
B.The membrane is selectively permeable, allowing smaller glucose molecules to pass while blocking larger starch molecules.
C.The membrane is completely impermeable to solutes and only allows the movement of water.
D.The membrane uses active transport to move glucose molecules into the beaker while consuming energy.
- 7.
A cell with salt concentration is placed in a salt solution. The solution is:
A.Hypertonic
B.Hypotonic
C.Isotonic
D.Saturated
- 8.
The process by which an Amoeba engulfs its food is known as:
A.Exocytosis.
B.Plasmolysis.
C.Endocytosis.
D.Osmosis.
- 9.
Which component of the cell membrane is primarily responsible for its 'selective' nature regarding large polar molecules?
A.Phospholipid heads.
B.Phospholipid tails.
C.Integral proteins.
D.Cholesterol molecules.
- 10.
Which process is responsible for the exchange of gases ( and ) in the alveoli of the lungs?
A.Active transport.
B.Osmosis.
C.Diffusion.
D.Endocytosis.
Download the worksheet for Cell - Demonstrate and explain osmosis, diffusion, and membrane permeability in cells to practice offline. It includes additional chapter-level practice questions.
Explain role of mitosis and meiosis in growth, repair, and variation
SubtopicExplain role of mitosis and meiosis in growth, repair, and variation under Cell for Grade 9 CBSE.
Preview questions (no answers)
- 1.
In the context of cell division, what does '2n' represent?
A.Number of daughter cells
B.Diploid number of chromosomes
C.Haploid number of chromosomes
D.Number of nuclei
- 2.
Which of the following cells would have half the number of chromosomes compared to a skin cell?
A.Liver cell
B.Brain cell
C.Egg cell
D.Muscle cell
- 3.
If mitosis stopped in a human body, what would be the immediate consequence?
A.No gametes would be produced
B.Wounds would not heal
C.Genetic variation would increase
D.Height would increase rapidly
- 4.
Which process maintains the genetic identity of a species in somatic cells?
A.Mitosis
B.Meiosis
C.Mutation
D.Crossing over
- 5.
Cancer is often defined as a disease of:
A.Uncontrolled meiosis
B.Uncontrolled mitosis
C.Reduced cell division
D.Loss of DNA
- 6.
Which of the following is a characteristic of meiosis but NOT mitosis?
A.Production of diploid cells
B.Occurrence in somatic cells
C.Reduction of chromosome number by half
D.Healing of wounds
- 7.
In the context of the cell cycle, what is the significance of the 'S phase' (Synthesis phase)?
A.The cell rests.
B.The cell divides into two.
C.DNA is replicated so that each daughter cell gets a copy.
D.The cell membrane disappears.
- 8.
Which of the following is the most significant reason why mitosis cannot produce gametes for sexual reproduction?
A.Mitosis is too slow
B.Mitosis doesn't allow for cytoplasm division
C.Mitosis maintains the chromosome number, which would lead to doubling of chromosomes in every generation upon fertilization
D.Mitosis only happens in plants
- 9.
How many nuclear divisions occur during mitosis and meiosis respectively?
A.One, One
B.Two, Two
C.One, Two
D.Two, One
- 10.
If a cell's DNA is represented as , what is the state of the cell after Meiosis I and before Meiosis II starts?
A.with replicated chromatids
B.with single chromatids
C.with single chromatids
D.with replicated chromatids
Download the worksheet for Cell - Explain role of mitosis and meiosis in growth, repair, and variation to practice offline. It includes additional chapter-level practice questions.
Preview questions (no answers)
- 1.
Which of the following is NOT an organism made of many cells?
A.Human
B.Tree
C.Bacteria
D.Fish
- 2.
Why do we use a brush to transfer the onion peel to the water?
A.To wash the peel
B.To avoid folding of the peel
C.To paint the peel
D.To dry the peel
- 3.
If a cell is described as 'omnis cellula e cellula', it means:
A.Cells are small
B.Cells come from non-living matter
C.Cells arise from pre-existing cells
D.All cells are square
- 4.
Which tool is used to pick up the thin onion peel?
A.Knife
B.Forceps
C.Spoon
D.Brush
- 5.
What is the 'working distance' in microscopy?
A.The distance between the objective lens and the slide
B.The distance between the eyepiece and the observer's eye
C.The length of the microscope tube
D.The distance light travels from the mirror to the stage
- 6.
Which organelle is usually not visible under a standard light microscope in a classroom setting?
A.Nucleus
B.Cell wall
C.Ribosome
D.Chloroplast
- 7.
A student accidentally uses concentrated salt solution instead of water to prepare an onion peel slide. What will likely happen to the cells?
A.The cells will swell and burst
B.The cells will shrink due to loss of water
C.The cells will divide rapidly
D.The salt will have no effect on the cells
- 8.
Which instrument is used to cut extremely thin sections (in nanometers) of tissues for electron microscopy?
A.Ultramicrotome
B.Hand razor
C.Centrifuge
D.Spectrophotometer
- 9.
Which of these is a 'vital stain' that can be used to stain living cells without killing them?
A.Janus Green B
B.Safranin
C.Hematoxylin
D.Eosin
- 10.
What is the 'parfocal' property of a microscope?
A.The ability to stay nearly in focus when switching from one objective lens to another
B.The ability to see two different slides at the same time
C.The ability to adjust the distance between the eyes
D.The ability to use the microscope in complete darkness
Download the worksheet for Cell - How to Study Cells? to practice offline. It includes additional chapter-level practice questions.
Preview questions (no answers)
- 1.
The primary component of the cell membrane is a bilayer of:
A.Proteins
B.Lipids
C.Carbohydrates
D.Cellulose
- 2.
What happens to a cell placed in a hypertonic solution?
A.It swells
B.It stays the same
C.It shrinks
D.It bursts
- 3.
Chromatin material is visible as entangled mass of thread-like structures when the cell is:
A.Dividing
B.Not dividing
C.Dead
D.Growing
- 4.
Organelles are found in:
A.Nucleoplasm
B.Cytoplasm
C.Cell wall
D.Nuclear membrane
- 5.
Which of the following is common to both mitochondria and plastids?
A.Both are found in animal cells
B.Both have their own and ribosomes
C.Both are involved in photosynthesis
D.Both are single-membrane bound organelles
- 6.
When an animal cell like a Red Blood Cell is placed in a hypotonic solution, what is the likely outcome?
A.The cell will shrink
B.The cell will gain water and likely burst
C.The cell will lose water and die
D.There will be no net movement of water
- 7.
Oxygen and Carbon dioxide move across the cell membrane by the process of:
A.Osmosis
B.Active Transport
C.Diffusion
D.Facilitated Diffusion
- 8.
Which of the following statements about the nucleus is incorrect?
A.It contains the genetic information of the cell.
B.It is the control center of cellular activities.
C.It is surrounded by a single membrane called the nuclear envelope.
D.It contains the nucleolus which produces ribosomes.
- 9.
Which of these is the correct difference between a plant cell and an animal cell regarding vacuoles?
A.Plant cells have many small vacuoles, animal cells have one large vacuole.
B.Plant cells have a large central vacuole, animal cells have small temporary vacuoles.
C.Animal cells have vacuoles for storage, plant cells do not have vacuoles.
D.Plant vacuoles store air, while animal vacuoles store food.
- 10.
The primary role of the Golgi apparatus in a cell is:
A.Packaging and dispatching materials synthesized near the ER.
B.Providing structural support to the cell.
C.Replicating the DNA for cell division.
D.Synthesizing enzymes for photosynthesis.
Download the worksheet for Cell - Structure of a Cell to practice offline. It includes additional chapter-level practice questions.
The Cell Interior - A Coordinated W orking System
SubtopicThe Cell Interior - A Coordinated W orking System under Cell for Grade 9 CBSE.
Preview questions (no answers)
- 1.
The membrane-bound structure that contains the cell's hereditary information is the:
A.Cytoplasm
B.Nucleus
C.Ribosome
D.Centrosome
- 2.
Unicellular organisms like Amoeba use their vacuoles for:
A.Photosynthesis
B.Structural rigidity
C.Expelling excess water
D.Making proteins
- 3.
Which organelle is responsible for breaking down large food particles into smaller ones?
A.Golgi apparatus
B.Ribosome
C.Lysosome
D.Mitochondria
- 4.
The site of production of ribosomes is the:
A.Cytoplasm
B.Nucleolus
C.Golgi Body
D.SER
- 5.
When energy is required for various chemical activities, releases energy by breaking into:
A.and Phosphate
B.and Glucose
C.Sugar and
D.and Water
- 6.
Which of these processes describes the engulfing of food and other material from the external environment by the cell membrane?
A.Exocytosis
B.Endocytosis
C.Diffusion
D.Plasmolysis
- 7.
The specific chemical nature of the enzymes found in lysosomes is:
A.Oxidative
B.Hydrolytic
C.Reductive
D.Synthetic
- 8.
If the 'tonoplast' of a plant cell vacuole fails to function, which of the following is most likely to happen?
A.The cell will immediately undergo photosynthesis faster
B.The cell will be unable to maintain its internal and osmotic balance
C.The cell will start producing oxygen in the dark
D.The nucleus will disappear
- 9.
The term 'Lumen' usually refers to:
A.The external surface of an organelle
B.The internal space or cavity within a tubular organelle like the ER
C.The pigment found in chloroplasts
D.The energy unit produced by mitochondria
- 10.
Why is the inner membrane of the chloroplast called the 'Thylakoid membrane' different from the outer membrane?
A.It is permeable to all ions
B.It contains the light-harvesting complexes and electron transport chain components
C.It is involved in the synthesis of lipids
D.It is the only membrane that contains DNA
Download the worksheet for Cell - The Cell Interior - A Coordinated W orking System to practice offline. It includes additional chapter-level practice questions.
How do Normal Cells Grow and Divide?
SubtopicHow do Normal Cells Grow and Divide? under Cell for Grade 9 CBSE.
Preview questions (no answers)
- 1.
At the end of telophase, the cell looks like it has:
A.One nucleus
B.Two nuclei
C.No nucleus
D.Four nuclei
- 2.
If a cell has 10 chromosomes, how many chromatids will be present during Metaphase?
A.5
B.10
C.20
D.40
- 3.
What is the small constricted region of a chromosome that holds sister chromatids together?
A.Centromere
B.Centriole
C.Centrosome
D.Cytomere
- 4.
The phase of the cell cycle where the cell increases in size and prepares for DNA replication is:
A.phase
B.phase
C.M phase
D.S phase
- 5.
The provided diagram shows the sequential stages of mitosis in a normal animal cell. If a metabolic error prevents the centromeres from splitting during the transition from Stage 2 to Stage 3, what would be the most direct consequence?
A.The cell will return to the phase to restart the cycle.
B.The will undergo another round of replication to compensate.
C.The sister chromatids will fail to separate, preventing equal distribution of to daughter cells.
D.The nuclear envelope will reform prematurely around the aligned chromosomes.
- 6.
A student is analyzing the amount of genetic material () within a cell as it moves through the cell cycle. If the initial amount of in the phase is represented as '', which option correctly identifies the content during the phase and the reason for this change?
A.; because the cell is in a resting period and no synthesis has occurred.
B.; because the genetic material has been duplicated during the intervening phase.
C.; because the cell has already divided the genetic material into two halves.
D.; because the cell has absorbed extra nucleotides from the surrounding cytoplasm to increase its size.
- 7.
Which structure is NOT involved in the division of an animal cell?
A.Spindle fibers
B.Centrioles
C.Cell plate
D.Centromere
- 8.
During Prophase, which of the following organelles usually disappears?
A.Mitochondria
B.Endoplasmic Reticulum and Golgi Complex
C.Ribosomes
D.Lysosomes
- 9.
Which of the following is the primary purpose of meiosis in animals?
A.Tissue repair
B.Asexual reproduction
C.Production of gametes
D.Body growth
- 10.
Mitosis is often referred to as 'equational division' because:
A.It divides the cytoplasm equally.
B.The number of chromosomes in the daughter cells is equal to the parent cell.
C.It occurs at an equal rate in all tissues.
D.It happens only in organisms with an equal number of chromosomes.
Download the worksheet for Cell - How do Normal Cells Grow and Divide? to practice offline. It includes additional chapter-level practice questions.
Cell Theory - The Unifying Principle of Biology
SubtopicCell Theory - The Unifying Principle of Biology under Cell for Grade 9 CBSE.
Preview questions (no answers)
- 1.
Which statement best summarizes the unifying principle of biology?
A.Cells are found only in animals
B.All life shares a cellular basis
C.Nucleus is found in all living things
D.Cells are always rectangular
- 2.
What is the structural unit of a mango tree?
A.Branch
B.Leaf
C.Root
D.Cell
- 3.
The cell theory is valid for all living organisms except:
A.Fungi
B.Algae
C.Viruses
D.Protozoa
- 4.
Before the discovery of cells, people believed life appeared from nowhere. This was called:
A.Cell theory
B.Spontaneous generation
C.Evolution
D.Heredity
- 5.
What is the main difference between the cell theory proposed by Schleiden and Schwann and the modern cell theory?
A.Modern theory excludes plants
B.Schleiden and Schwann's theory did not explain how new cells were formed
C.Schleiden and Schwann's theory stated that cells were non-living
D.There is no difference between the two
- 6.
The significance of the cell theory is that it:
A.Disproved the existence of atoms
B.Unified the study of botany and zoology
C.Confirmed that all cells are square in shape
D.Proved that only animals are living
- 7.
Bacteria are microscopic organisms. According to cell theory, which statement is true about them?
A.They are not made of cells
B.They are unicellular organisms
C.They arise from non-living dirt
D.They do not perform metabolic activities
- 8.
The cell theory provides a framework for understanding that all life is connected. This concept is most closely related to which branch of biology?
A.Ecology
B.Genetics
C.Evolutionary Biology
D.Anatomy
- 9.
Which breakthrough in the century allowed scientists to understand that 'hereditary information is passed from cell to cell'?
A.The discovery of the light microscope
B.The discovery of the structure of DNA by Watson and Crick
C.The discovery of the cell wall by Hooke
D.The discovery of the nucleus by Brown
- 10.
Which of the following statements about the modern cell theory is FALSE?
A.All known living things are made up of one or more cells
B.All living cells arise from pre-existing cells by division
C.The cell is the fundamental unit of structure and function in all living organisms
D.Cells within a multicellular organism are entirely independent and never cooperate
Download the worksheet for Cell - Cell Theory - The Unifying Principle of Biology to practice offline. It includes additional chapter-level practice questions.