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Cell: The Unit of Life MCQs

Class 11 Biology — questions with answers and worked explanations.

20 free questions Class 11 Biology Answers + explanations No sign-up

These questions are drawn from the Pariksha Sutra question bank for Cell: The Unit of Life, part of the Class 11 Biology syllabus. Each one shows the correct answer and, where a method helps, the working behind it.

Read the question, decide your answer before looking, then check the explanation — that is what turns practice into marks. If a question catches you out, the explanation is the part worth re-reading.

Questions

Question 1
The cell theory was formulated by which two scientists?
  1. Matthias Schleiden and Theodor Schwann
  2. Robert Hooke and Robert Brown
  3. Louis Pasteur and Rudolf Virchow
  4. Anton von Leeuwenhoek and Camillo Golgi
Answer: Matthias Schleiden and Theodor Schwann
Question 2
Which surface structure of a bacterial cell is mainly responsible for its motility?
  1. Fimbriae
  2. Pili
  3. Flagella
  4. Glycocalyx
Answer: Flagella
Question 3
Cytoplasmic connections between adjacent plant cells passing through the cell wall are called:
  1. Desmosomes
  2. Plasmodesmata
  3. Tight junctions
  4. Gap junctions
Answer: Plasmodesmata
Question 4
The inner membrane of the mitochondrion is folded inward to form:
  1. Grana
  2. Cisternae
  3. Thylakoids
  4. Cristae
Answer: Cristae
Question 5
Bacteria are classified into four categories based on shape. A comma-shaped bacterium is called:
  1. Bacillus
  2. Vibrio
  3. Spirillum
  4. Coccus
Answer: Vibrio
Question 6
The cell wall of fungi is composed of:
  1. Cellulose
  2. Peptidoglycan
  3. Chitin
  4. Pectin
Answer: Chitin
Question 7
Mitochondria are commonly referred to as the:
  1. Suicidal bags of the cell
  2. Protein factories
  3. Powerhouses of the cell
  4. Control centres of the cell
Answer: Powerhouses of the cell
Question 8
Ribosomes are composed of two subunits made up of:
  1. Phospholipids and carbohydrates
  2. DNA and lipids
  3. Only proteins
  4. Ribosomal RNA and proteins
Answer: Ribosomal RNA and proteins
Question 9
The idea that new cells arise only from pre-existing cells (Omnis cellula-e cellula) was given by:
  1. Matthias Schleiden
  2. Rudolf Virchow
  3. Robert Hooke
  4. Theodor Schwann
Answer: Rudolf Virchow
Question 10
The bacterial flagellum is composed of three parts. Which is correct?
  1. Filament, hook and basal body
  2. Head, midpiece and tail
  3. Axoneme, matrix and sheath
  4. Cortex, core and coat
Answer: Filament, hook and basal body
Question 11
The network of tubular membranes continuous with the outer nuclear membrane is the:
  1. Endoplasmic reticulum
  2. Golgi apparatus
  3. Peroxisome
  4. Lysosome
Answer: Endoplasmic reticulum
Question 12
The site of the citric acid (Krebs) cycle within the mitochondrion is the:
  1. Outer membrane
  2. Matrix
  3. Cristae surface
  4. Intermembrane space
Answer: Matrix
Question 13
Who first observed and coined the term 'cell' while examining a cork slice?
  1. Robert Brown
  2. Anton von Leeuwenhoek
  3. Robert Hooke
  4. Theodor Schwann
Answer: Robert Hooke
Question 14
The widely accepted model describing the structure of the plasma membrane is the:
  1. Sandwich model
  2. Fluid mosaic model
  3. Lamellar model
  4. Unit membrane model
Answer: Fluid mosaic model
Question 15
Rough endoplasmic reticulum appears rough because of the presence of:
  1. Microtubules
  2. Ribosomes on its surface
  3. Lysosomes on its surface
  4. Glycogen granules
Answer: Ribosomes on its surface
Question 16
Plastids are found in which of the following cells?
  1. Bacterial cells
  2. All prokaryotic cells
  3. Animal cells only
  4. Plant cells and euglenoids
Answer: Plant cells and euglenoids
Question 17
Who first saw and described free-living cells (living cells) using a microscope?
  1. Rudolf Virchow
  2. Robert Hooke
  3. Matthias Schleiden
  4. Anton von Leeuwenhoek
Answer: Anton von Leeuwenhoek
Question 18
According to the fluid mosaic model, the quasi-fluid nature of the lipid bilayer allows:
  1. Rigid fixation of all membrane proteins
  2. Free passage of all ions without proteins
  3. Lateral movement of proteins within the bilayer
  4. Complete impermeability to water
Answer: Lateral movement of proteins within the bilayer
Question 19
Smooth endoplasmic reticulum is the major site of synthesis of:
  1. Nucleic acids
  2. Lipids
  3. Proteins
  4. Carbohydrate cell walls
Answer: Lipids
Question 20
The colourless plastids that store nutrients are called:
  1. Chloroplasts
  2. Elaioplasts only
  3. Leucoplasts
  4. Chromoplasts
Answer: Leucoplasts

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