IB Grade 12 Biology by Pavan | Practice Test to Test Your Knowledge
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IB Grade 12 Biology

IB Grade 12 Biology

Thorough mock test covering scientific inquiry, experimental design, and conceptual understanding. Includes laboratory skills, data analysis, and interdisciplinary scientific applications.

2025-07-22
Pavan Pavan
IB Class 12 Biology Grade 12

Duration

30 min

Questions

30

Marking

Negative

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Questions Preview

Which of the following is a core principle of the cell theory?

A
All living organisms are composed of one or more cells
B
Cells can arise from non-living matter
C
All cells contain a nucleus
D
Cells are the smallest units of matter

Which of the following is an exception to the cell theory?

A
Striated muscle fibers
B
All plants
C
Animal cells
D
Bacteria

What is the primary difference between prokaryotic and eukaryotic cells?

A
Prokaryotic cells lack a nucleus
B
Eukaryotic cells lack a nucleus
C
Prokaryotic cells have linear chromosomes
D
Eukaryotic cells are smaller in size

What is the role of the plasma membrane in a cell?

A
Regulates the entry and exit of materials
B
Stores genetic material
C
Synthesizes proteins
D
Produces energy through respiration

Which of the following is true about the structure of eukaryotic cells?

A
They contain membrane-bound organelles
B
They lack a nucleus
C
They do not contain ribosomes
D
They are typically smaller than prokaryotic cells

Which organelle is responsible for energy production in eukaryotic cells?

A
Mitochondria
B
Nucleus
C
Rough Endoplasmic Reticulum
D
Golgi Apparatus

What is the function of ribosomes in a cell?

A
Protein synthesis
B
Energy production
C
Storage of genetic material
D
Cell division

What structure is common to both prokaryotic and eukaryotic cells?

A
Plasma membrane
B
Nucleus
C
Mitochondria
D
Chloroplast

Which of the following is a key characteristic of striated muscle fibers?

A
Multinucleated
B
Lack mitochondria
C
Do not contain ribosomes
D
Have no cell membrane

What is the function of the slime capsule in prokaryotic cells?

A
Protection against desiccation and phagocytosis
B
Energy production
C
Storage of genetic material
D
Regulation of material exchange

Which of the following is a feature of the Golgi apparatus?

A
Modifies and packages proteins
B
Synthesizes proteins
C
Stores genetic material
D
Contains digestive enzymes

What is the key difference between the endoplasmic reticulum (ER) and the Golgi apparatus?

A
The ER synthesizes proteins, while the Golgi apparatus modifies and packages proteins
B
The ER modifies proteins, while the Golgi apparatus synthesizes proteins
C
The ER contains ribosomes, while the Golgi apparatus does not
D
The ER is involved in photosynthesis, while the Golgi apparatus is involved in respiration

What does the fluid mosaic model of the cell membrane describe?

A
The structure of the membrane consisting of a phospholipid bilayer with proteins and cholesterol
B
The static nature of the membrane, which is rigid and unchanging
C
The composition of the membrane being solely phospholipids
D
The absence of proteins in the membrane

Which of the following is true about the phospholipid bilayer in the cell membrane?

A
Hydrophilic heads face outward, and hydrophobic tails face inward
B
Hydrophobic heads face outward, and hydrophilic tails face inward
C
Both heads and tails are hydrophobic
D
Both heads and tails are hydrophilic

What is the function of cholesterol in animal cell membranes?

A
Modulates membrane fluidity and stability
B
Facilitates protein synthesis
C
Regulates the entry of water molecules
D
Stores genetic information

Which of the following describes facilitated diffusion?

A
Movement of molecules across the membrane via protein channels without energy
B
Movement of molecules from low to high concentration using energy
C
Movement of molecules through the phospholipid bilayer without protein channels
D
Movement of water across a semi-permeable membrane

Which of the following is a feature of active transport?

A
Requires energy in the form of ATP
B
Moves molecules from high to low concentration
C
Occurs via protein channels
D
Does not require any proteins

What is the role of the sodium-potassium pump?

A
Pumps sodium ions out of the cell and potassium ions into the cell
B
Pumps sodium ions into the cell and potassium ions out of the cell
C
Facilitates the entry of glucose into the cell
D
Transfers water molecules across the membrane

What is osmosis?

A
Movement of water across a semi-permeable membrane
B
Movement of solutes across a semi-permeable membrane
C
Active transport of water
D
Diffusion of gases across a membrane

Which of the following describes the cell cycle?

A
The series of events leading to cell division and duplication
B
The process of protein synthesis in the cell
C
The process of energy production in the cell
D
The sequence of stages in protein folding

What happens during the prophase stage of mitosis?

A
Chromatin condenses into visible chromosomes
B
Chromosomes align at the cell's equator
C
Chromatids are pulled apart towards opposite poles
D
Nuclear envelopes reform

What is cytokinesis?

A
Division of the cytoplasm to form two daughter cells
B
Replication of DNA before cell division
C
Formation of spindle fibers during mitosis
D
Separation of sister chromatids during anaphase

Which type of microscopy uses electron beams to magnify specimens?

A
Electron microscopy
B
Light microscopy
C
Confocal microscopy
D
Fluorescence microscopy

What is the main advantage of using electron microscopy over light microscopy?

A
Higher resolution and magnification
B
Can observe living cells
C
Cheaper and easier to use
D
Uses visible light for observation

Which of the following is true about the light microscope?

A
It can resolve structures smaller than 200 nm
B
It uses electron beams to magnify specimens
C
It is relatively inexpensive
D
It can only observe dead cells

What is the function of the ribosomes in prokaryotic cells?

A
Protein synthesis
B
DNA replication
C
Energy production
D
Storage of nutrients

Which structure is involved in photosynthesis in plant cells?

A
Chloroplast
B
Mitochondria
C
Nucleus
D
Rough endoplasmic reticulum

What is the function of the large central vacuole in plant cells?

A
Maintaining turgor pressure
B
Storing genetic information
C
Synthesizing proteins
D
Facilitating protein transport

What is the function of pili in prokaryotic cells?

A
Aid in attachment and DNA transfer
B
Facilitate movement
C
Protect against desiccation
D
Store genetic material

Which of the following is a characteristic of prokaryotic cells?

A
Lack a nucleus
B
Contain a nucleus
C
Contain membrane-bound organelles
D
Are larger than eukaryotic cells