Cell Biology
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Preview questions (no answers)
- 1.
What did the discovery of cells help scientists understand about diseases?
A.Diseases are caused by bad luck
B.Diseases can affect the health and function of cells
C.Diseases only happen to rocks
D.Diseases are not real
- 2.
If you look at a sample of pond water and see a single-celled amoeba, which part of the Cell Theory does this support?
A.All living things are made of one or more cells
B.Cells only exist in dry places
C.Plants do not have cells
D.Cells are made of atoms
- 3.
Which of the following is the best definition of the 'Cell Theory'?
A.An idea about how animals sleep
B.A collection of principles describing cells as the basis of life
C.A guess about why plants are green
D.A rule about how to use a microscope
- 4.
What happens to a cell's DNA during cell division?
A.It is destroyed
B.It is copied and passed to the new cells
C.It disappears
D.It turns into water
- 5.
The Cell Theory helps scientists classify which of the following as 'living'?
A.A piece of gold
B.A single yeast organism
C.A drop of pure water
D.A beam of sunlight
- 6.
Which of these is a direct application of the Cell Theory in medicine?
A.Understanding how bacteria multiply to cause infection
B.Studying the movement of the tides
C.Calculating the speed of light
D.Predicting the weather using cloud patterns
- 7.
In the 1800s, what did the discovery of the 'cell' help scientists understand about the 'unseen' world?
A.That the unseen world is empty
B.That life exists at a scale too small for the human eye to see
C.That only big things are alive
D.That microscopes create illusions
- 8.
Which of these discoveries provided the strongest evidence for the first tenet of Cell Theory (All living things are made of cells)?
A.Microscopic examination of hundreds of different plant and animal tissues across several years
B.The discovery of DNA's double helix structure
C.The observation that some cells can move using cilia
D.The fact that cells are filled with a liquid called cytoplasm
- 9.
If a cell's volume is represented as and its surface area as , what happens to the ratio as the side length () increases from 1 to 10?
A.The ratio stays the same
B.The ratio increases, making the cell more efficient
C.The ratio decreases, making the cell less efficient
D.The ratio becomes zero
- 10.
The study of 'Extremophiles' (cells that live in extreme heat or acid) supports the Cell Theory because:
A.It shows that cells can be made of fire or ice
B.It demonstrates that the basic unit of life is adaptable but still cellular in nature
C.It proves that some cells do not need DNA to survive
D.It show that cells in extreme environments do not need to reproduce
Download the worksheet for Cell Biology - Cell Theory to practice offline. It includes additional chapter-level practice questions.
Microscope Parts and Usage
SubtopicMicroscope Parts and Usage under Cell Biology for Grade 6 IB.
Preview questions (no answers)
- 1.
In a school microscope, which objective lens is usually the shortest?
A.The lens
B.The lens
C.The (low power) lens
D.The lens
- 2.
Which part of the microscope is often used as a handle when tilting or carrying the instrument?
A.The stage
B.The arm
C.The eyepiece
D.The nosepiece
- 3.
When observing a slide, if you move the slide 'up' (away from you), which way does the image move through the eyepiece?
A.Up
B.Down (toward you)
C.Left
D.Right
- 4.
If you see a large, dark-edged circle in your field of view that is perfectly round, what are you likely looking at?
A.The nucleus of a cell
B.A plant cell wall
C.An air bubble
D.A piece of dust
- 5.
How should you remove excess water from under a coverslip when making a wet mount?
A.Blow on it until it evaporates
B.Touch a piece of paper towel to the edge of the coverslip
C.Lift the coverslip and wipe the slide
D.Place the slide on a heater
- 6.
What is the function of the 'inclination joint' found on some older microscopes?
A.To change the objective lenses
B.To tilt the microscope for more comfortable viewing
C.To adjust the brightness of the lamp
D.To lock the stage in place
- 7.
If you want to view a larger area of your slide, what should you do?
A.Switch to a higher magnification
B.Switch to a lower magnification
C.Open the diaphragm wider
D.Move the slide closer to the lens
- 8.
When using the highest dry power objective (usually or ), the image is blurry no matter how much the fine adjustment is turned. What is a common troubleshooting step to take first?
A.Switch back to low power to re-center and check focus
B.Increase the light to maximum intensity
C.Clean the scanning lens with a paper towel
D.Add a drop of oil to the lens
- 9.
A student uses a microscope to look at a slide that has been stained with iodine. What specific structure in a plant cell will likely turn dark purple/black?
A.The Cell Wall
B.Starch granules (Leucoplasts)
C.The Cytoplasm
D.The Vacuole
- 10.
Why is the scanning objective lens () usually shorter in length than the high-power objective lens ()?
A.To make it lighter so the nosepiece rotates easily
B.To allow for a longer working distance since it doesn't need to be close to the slide
C.To prevent light from escaping from the sides
D.Because magnification is directly proportional to the amount of glass used
Download the worksheet for Cell Biology - Microscope Parts and Usage to practice offline. It includes additional chapter-level practice questions.
Plant vs. Animal Cells
SubtopicPlant vs. Animal Cells under Cell Biology for Grade 6 IB.
Preview questions (no answers)
- 1.
What is the main function of chloroplasts?
A.To digest food
B.To perform photosynthesis
C.To store DNA
D.To build the cell wall
- 2.
Which of these provides the most internal pressure to keep a plant cell firm?
A.The small animal vacuole
B.The large central vacuole
C.The mitochondria
D.The Golgi body
- 3.
What is the job of the cell membrane?
A.To make food
B.To protect and control movement of materials
C.To produce energy
D.To hold DNA
- 4.
Which of the following is found in plant cells but never in animal cells?
A.Mitochondria
B.Cell membrane
C.Cell wall
D.Nucleus
- 5.
If you compare a cell to a post office, which organelle is responsible for 'labeling' and 'shipping' materials to their correct destination?
A.The Nucleus
B.The Golgi Apparatus
C.The Cytoplasm
D.The Cell Wall
- 6.
Which of these organelles is enclosed by a double membrane and contains its own DNA, supporting the idea that it was once a free-living organism?
A.Vacuole
B.Ribosome
C.Mitochondria
D.Golgi apparatus
- 7.
Which organelle is responsible for the 'Rough' appearance of the Rough Endoplasmic Reticulum?
A.Chloroplasts
B.Ribosomes
C.Mitochondria
D.Lysosomes
- 8.
When examining a cell under a microscope, you see a green, oval-shaped structure. What is its likely function?
A.Storing water for the cell
B.Breaking down food to release energy
C.Capturing sunlight to produce glucose
D.Protecting the cell from bacteria
- 9.
Which of the following organelles is NOT part of the endomembrane system but is found in both plant and animal cells?
A.Mitochondria
B.Endoplasmic Reticulum
C.Golgi apparatus
D.Lysosomes
- 10.
Which of these is the most accurate description of the cell membrane's role in an animal cell?
A.It provides the rigid shape of the cell
B.It is the site where proteins are made
C.It acts as a gateway, controlling what enters and exits the cell
D.It stores the genetic information for the cell
Download the worksheet for Cell Biology - Plant vs. Animal Cells to practice offline. It includes additional chapter-level practice questions.
Organelles and their Functions
SubtopicOrganelles and their Functions under Cell Biology for Grade 6 IB.
Preview questions (no answers)
- 1.
Which of the following is true for all cells?
A.They all have a cell wall.
B.They all have a nucleus.
C.They all have a cell membrane.
D.They all have chloroplasts.
- 2.
Which structure is the outermost layer of an animal cell?
A.Cell wall
B.Nuclear membrane
C.Cell membrane
D.Cytoplasm
- 3.
What is the specific function of the Golgi apparatus?
A.Synthesizing DNA
B.Modifying and packaging proteins
C.Capturing light energy
D.Breaking down old organelles
- 4.
Which organelle would you NOT expect to find in a human muscle cell?
A.Nucleus
B.Mitochondria
C.Chloroplast
D.Cell membrane
- 5.
Which of the following lists the structures from most external to most internal in a plant cell?
A.Cell Membrane, Cell Wall, Nucleus
B.Nucleus, Cell Membrane, Cell Wall
C.Cell Wall, Cell Membrane, Nucleus
D.Cell Wall, Nucleus, Cell Membrane
- 6.
If you were to compare a cell to a city, which organelle would represent the 'power plant' that provides electricity?
A.Chloroplast
B.Mitochondria
C.Nucleus
D.Ribosome
- 7.
Why are vacuoles in animal cells usually much smaller than the large central vacuole in plant cells?
A.Animal cells don't need to store any water.
B.Animals have skeletons for support, so they don't rely on vacuole pressure for shape.
C.Animal cells use mitochondria for storage instead.
D.Animal cells are too small to fit large vacuoles.
- 8.
Which of the following represents the most complex level of organization that still functions as a single living unit?
A.Organelle
B.Cell
C.Tissue
D.Organ
- 9.
If a researcher found a cell that had a nucleus but no mitochondria, how would this cell likely obtain its energy?
A.It would be unable to survive as all eukaryotic cells require mitochondria.
B.It would use photosynthesis exclusively.
C.It would rely on less efficient processes like fermentation in the cytoplasm.
D.It would absorb directly from the environment through the cell wall.
- 10.
What is the specific role of the 'chlorophyll' found inside the thylakoids of a chloroplast?
A.To store the glucose produced during the day.
B.To absorb light energy and convert it into chemical energy.
C.To protect the chloroplast from being destroyed by oxygen.
D.To provide the green color needed for camouflage.
Download the worksheet for Cell Biology - Organelles and their Functions to practice offline. It includes additional chapter-level practice questions.
Unicellular and Multicellular Organisms
SubtopicUnicellular and Multicellular Organisms under Cell Biology for Grade 6 IB.
Preview questions (no answers)
- 1.
If you are looking at a sample of pond water and see a tiny moving speck, it is likely:
A.A multicellular human
B.A unicellular organism
C.A piece of plastic
D.A large fish
- 2.
What do we call the tiny structures inside a cell that carry out specific functions?
A.Organs
B.Organelles
C.Organisms
D.Tissues
- 3.
Which of the following is true about multicellular organisms?
A.They are made of only one cell
B.They are made of many cells
C.They do not need energy
D.They are all invisible
- 4.
Which of these is a collection of tissues that perform a specific function?
A.A cell
B.An organ
C.An atom
D.A chemical
- 5.
Which of the following statements about 'Metabolism' is true for both unicellular and multicellular organisms?
A.It only occurs in the digestive system of multicellular animals
B.It refers to the sum of all chemical reactions that happen within their cells
C.Unicellular organisms do not have a metabolism
D.Metabolism only happens when an organism is moving
- 6.
How do multicellular organisms obtain the materials they need for growth?
A.By dividing their one cell into two
B.By taking in matter from their environment and processing it through systems
C.By creating matter out of nothing inside their nucleus
D.They do not need materials because they do not grow
- 7.
Which of these is found in both unicellular organisms and multicellular organisms?
A.A respiratory system
B.Cytoplasm
C.Tissues
D.Organs
- 8.
What would be the most likely result if a multicellular organism's cells suddenly stopped specializing?
A.The organism would grow much faster.
B.The organism would become a pile of identical cells and lose its complex functions.
C.The organism would evolve into a new species immediately.
D.The cells would start to perform photosynthesis to survive.
- 9.
Why is it necessary for multicellular organisms to have specialized 'exchange surfaces' like lungs or gills?
A.To prevent too much oxygen from entering the body.
B.To compensate for the low SA:V ratio of the whole organism by providing a high SA for gas exchange.
C.To give the organism a specific shape that is recognizable to others.
D.Because internal cells do not have cell membranes of their own.
- 10.
Which of these organisms is the best example of a 'link' between unicellular and multicellular life, existing as a group of identical cells that can also survive alone?
A.A human.
B.An amoeba.
C.A colonial organism like Gonium.
D.A mushroom.
Download the worksheet for Cell Biology - Unicellular and Multicellular Organisms to practice offline. It includes additional chapter-level practice questions.